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1 | office | 1 | # 2007 July 17 |
2 | # |
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3 | # The author disclaims copyright to this source code. In place of |
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4 | # a legal notice, here is a blessing: |
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5 | # |
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6 | # May you do good and not evil. |
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7 | # May you find forgiveness for yourself and forgive others. |
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8 | # May you share freely, never taking more than you give. |
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9 | # |
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10 | #*********************************************************************** |
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11 | # This file implements regression tests for SQLite library. The |
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12 | # focus of this file is testing SELECT statements that contain |
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13 | # aggregate min() and max() functions and which are handled as |
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14 | # as a special case. This file makes sure that the min/max |
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15 | # optimization works right in the presence of descending |
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16 | # indices. Ticket #2514. |
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17 | # |
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18 | # $Id: minmax2.test,v 1.2 2008/01/05 17:39:30 danielk1977 Exp $ |
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19 | |||
20 | set testdir [file dirname $argv0] |
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21 | source $testdir/tester.tcl |
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22 | |||
23 | do_test minmax2-1.0 { |
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24 | execsql { |
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25 | PRAGMA legacy_file_format=0; |
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26 | BEGIN; |
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27 | CREATE TABLE t1(x, y); |
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28 | INSERT INTO t1 VALUES(1,1); |
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29 | INSERT INTO t1 VALUES(2,2); |
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30 | INSERT INTO t1 VALUES(3,2); |
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31 | INSERT INTO t1 VALUES(4,3); |
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32 | INSERT INTO t1 VALUES(5,3); |
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33 | INSERT INTO t1 VALUES(6,3); |
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34 | INSERT INTO t1 VALUES(7,3); |
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35 | INSERT INTO t1 VALUES(8,4); |
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36 | INSERT INTO t1 VALUES(9,4); |
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37 | INSERT INTO t1 VALUES(10,4); |
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38 | INSERT INTO t1 VALUES(11,4); |
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39 | INSERT INTO t1 VALUES(12,4); |
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40 | INSERT INTO t1 VALUES(13,4); |
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41 | INSERT INTO t1 VALUES(14,4); |
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42 | INSERT INTO t1 VALUES(15,4); |
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43 | INSERT INTO t1 VALUES(16,5); |
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44 | INSERT INTO t1 VALUES(17,5); |
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45 | INSERT INTO t1 VALUES(18,5); |
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46 | INSERT INTO t1 VALUES(19,5); |
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47 | INSERT INTO t1 VALUES(20,5); |
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48 | COMMIT; |
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49 | SELECT DISTINCT y FROM t1 ORDER BY y; |
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50 | } |
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51 | } {1 2 3 4 5} |
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52 | |||
53 | do_test minmax2-1.1 { |
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54 | set sqlite_search_count 0 |
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55 | execsql {SELECT min(x) FROM t1} |
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56 | } {1} |
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57 | do_test minmax2-1.2 { |
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58 | set sqlite_search_count |
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59 | } {19} |
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60 | do_test minmax2-1.3 { |
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61 | set sqlite_search_count 0 |
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62 | execsql {SELECT max(x) FROM t1} |
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63 | } {20} |
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64 | do_test minmax2-1.4 { |
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65 | set sqlite_search_count |
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66 | } {19} |
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67 | do_test minmax2-1.5 { |
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68 | execsql {CREATE INDEX t1i1 ON t1(x DESC)} |
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69 | set sqlite_search_count 0 |
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70 | execsql {SELECT min(x) FROM t1} |
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71 | } {1} |
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72 | do_test minmax2-1.6 { |
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73 | set sqlite_search_count |
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74 | } {1} |
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75 | do_test minmax2-1.7 { |
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76 | set sqlite_search_count 0 |
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77 | execsql {SELECT max(x) FROM t1} |
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78 | } {20} |
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79 | do_test minmax2-1.8 { |
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80 | set sqlite_search_count |
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81 | } {0} |
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82 | do_test minmax2-1.9 { |
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83 | set sqlite_search_count 0 |
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84 | execsql {SELECT max(y) FROM t1} |
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85 | } {5} |
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86 | do_test minmax2-1.10 { |
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87 | set sqlite_search_count |
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88 | } {19} |
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89 | |||
90 | do_test minmax2-2.0 { |
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91 | execsql { |
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92 | CREATE TABLE t2(a INTEGER PRIMARY KEY, b); |
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93 | INSERT INTO t2 SELECT * FROM t1; |
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94 | } |
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95 | set sqlite_search_count 0 |
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96 | execsql {SELECT min(a) FROM t2} |
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97 | } {1} |
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98 | do_test minmax2-2.1 { |
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99 | set sqlite_search_count |
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100 | } {0} |
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101 | do_test minmax2-2.2 { |
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102 | set sqlite_search_count 0 |
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103 | execsql {SELECT max(a) FROM t2} |
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104 | } {20} |
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105 | do_test minmax2-2.3 { |
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106 | set sqlite_search_count |
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107 | } {0} |
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108 | |||
109 | do_test minmax2-3.0 { |
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110 | ifcapable subquery { |
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111 | execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)} |
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112 | } else { |
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113 | db function max_a_t2 {execsql {SELECT max(a) FROM t2}} |
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114 | execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)} |
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115 | } |
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116 | set sqlite_search_count 0 |
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117 | execsql {SELECT max(a) FROM t2} |
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118 | } {21} |
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119 | do_test minmax2-3.1 { |
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120 | set sqlite_search_count |
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121 | } {0} |
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122 | do_test minmax2-3.2 { |
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123 | ifcapable subquery { |
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124 | execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)} |
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125 | } else { |
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126 | db function max_a_t2 {execsql {SELECT max(a) FROM t2}} |
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127 | execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)} |
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128 | } |
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129 | set sqlite_search_count 0 |
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130 | ifcapable subquery { |
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131 | execsql { SELECT b FROM t2 WHERE a=(SELECT max(a) FROM t2) } |
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132 | } else { |
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133 | execsql { SELECT b FROM t2 WHERE a=max_a_t2() } |
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134 | } |
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135 | } {999} |
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136 | do_test minmax2-3.3 { |
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137 | set sqlite_search_count |
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138 | } {0} |
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139 | |||
140 | ifcapable {compound && subquery} { |
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141 | do_test minmax2-4.1 { |
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142 | execsql { |
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143 | SELECT coalesce(min(x+0),-1), coalesce(max(x+0),-1) FROM |
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144 | (SELECT * FROM t1 UNION SELECT NULL as 'x', NULL as 'y') |
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145 | } |
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146 | } {1 20} |
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147 | do_test minmax2-4.2 { |
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148 | execsql { |
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149 | SELECT y, coalesce(sum(x),0) FROM |
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150 | (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1) |
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151 | GROUP BY y ORDER BY y; |
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152 | } |
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153 | } {1 1 2 5 3 22 4 92 5 90 6 0} |
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154 | do_test minmax2-4.3 { |
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155 | execsql { |
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156 | SELECT y, count(x), count(*) FROM |
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157 | (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1) |
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158 | GROUP BY y ORDER BY y; |
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159 | } |
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160 | } {1 1 1 2 2 3 3 4 5 4 8 9 5 5 6 6 0 1} |
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161 | } ;# ifcapable compound |
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162 | |||
163 | # Make sure the min(x) and max(x) optimizations work on empty tables |
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164 | # including empty tables with indices. Ticket #296. |
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165 | # |
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166 | do_test minmax2-5.1 { |
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167 | execsql { |
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168 | CREATE TABLE t3(x INTEGER UNIQUE NOT NULL); |
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169 | SELECT coalesce(min(x),999) FROM t3; |
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170 | } |
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171 | } {999} |
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172 | do_test minmax2-5.2 { |
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173 | execsql { |
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174 | SELECT coalesce(min(rowid),999) FROM t3; |
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175 | } |
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176 | } {999} |
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177 | do_test minmax2-5.3 { |
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178 | execsql { |
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179 | SELECT coalesce(max(x),999) FROM t3; |
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180 | } |
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181 | } {999} |
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182 | do_test minmax2-5.4 { |
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183 | execsql { |
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184 | SELECT coalesce(max(rowid),999) FROM t3; |
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185 | } |
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186 | } {999} |
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187 | do_test minmax2-5.5 { |
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188 | execsql { |
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189 | SELECT coalesce(max(rowid),999) FROM t3 WHERE rowid<25; |
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190 | } |
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191 | } {999} |
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192 | |||
193 | # Make sure the min(x) and max(x) optimizations work when there |
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194 | # is a LIMIT clause. Ticket #396. |
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195 | # |
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196 | do_test minmax2-6.1 { |
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197 | execsql { |
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198 | SELECT min(a) FROM t2 LIMIT 1 |
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199 | } |
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200 | } {1} |
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201 | do_test minmax2-6.2 { |
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202 | execsql { |
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203 | SELECT max(a) FROM t2 LIMIT 3 |
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204 | } |
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205 | } {22} |
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206 | do_test minmax2-6.3 { |
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207 | execsql { |
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208 | SELECT min(a) FROM t2 LIMIT 0,100 |
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209 | } |
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210 | } {1} |
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211 | do_test minmax2-6.4 { |
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212 | execsql { |
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213 | SELECT max(a) FROM t2 LIMIT 1,100 |
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214 | } |
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215 | } {} |
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216 | do_test minmax2-6.5 { |
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217 | execsql { |
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218 | SELECT min(x) FROM t3 LIMIT 1 |
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219 | } |
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220 | } {{}} |
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221 | do_test minmax2-6.6 { |
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222 | execsql { |
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223 | SELECT max(x) FROM t3 LIMIT 0 |
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224 | } |
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225 | } {} |
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226 | do_test minmax2-6.7 { |
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227 | execsql { |
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228 | SELECT max(a) FROM t2 LIMIT 0 |
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229 | } |
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230 | } {} |
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231 | |||
232 | # Make sure the max(x) and min(x) optimizations work for nested |
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233 | # queries. Ticket #587. |
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234 | # |
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235 | do_test minmax2-7.1 { |
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236 | execsql { |
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237 | SELECT max(x) FROM t1; |
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238 | } |
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239 | } 20 |
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240 | ifcapable subquery { |
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241 | do_test minmax2-7.2 { |
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242 | execsql { |
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243 | SELECT * FROM (SELECT max(x) FROM t1); |
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244 | } |
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245 | } 20 |
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246 | } |
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247 | do_test minmax2-7.3 { |
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248 | execsql { |
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249 | SELECT min(x) FROM t1; |
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250 | } |
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251 | } 1 |
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252 | ifcapable subquery { |
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253 | do_test minmax2-7.4 { |
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254 | execsql { |
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255 | SELECT * FROM (SELECT min(x) FROM t1); |
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256 | } |
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257 | } 1 |
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258 | } |
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259 | |||
260 | # Make sure min(x) and max(x) work correctly when the datatype is |
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261 | # TEXT instead of NUMERIC. Ticket #623. |
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262 | # |
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263 | do_test minmax2-8.1 { |
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264 | execsql { |
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265 | CREATE TABLE t4(a TEXT); |
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266 | INSERT INTO t4 VALUES('1234'); |
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267 | INSERT INTO t4 VALUES('234'); |
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268 | INSERT INTO t4 VALUES('34'); |
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269 | SELECT min(a), max(a) FROM t4; |
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270 | } |
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271 | } {1234 34} |
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272 | do_test minmax2-8.2 { |
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273 | execsql { |
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274 | CREATE TABLE t5(a INTEGER); |
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275 | INSERT INTO t5 VALUES('1234'); |
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276 | INSERT INTO t5 VALUES('234'); |
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277 | INSERT INTO t5 VALUES('34'); |
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278 | SELECT min(a), max(a) FROM t5; |
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279 | } |
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280 | } {34 1234} |
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281 | |||
282 | # Ticket #658: Test the min()/max() optimization when the FROM clause |
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283 | # is a subquery. |
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284 | # |
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285 | ifcapable {compound && subquery} { |
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286 | do_test minmax2-9.1 { |
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287 | execsql { |
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288 | SELECT max(rowid) FROM ( |
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289 | SELECT max(rowid) FROM t4 UNION SELECT max(rowid) FROM t5 |
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290 | ) |
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291 | } |
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292 | } {1} |
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293 | do_test minmax2-9.2 { |
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294 | execsql { |
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295 | SELECT max(rowid) FROM ( |
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296 | SELECT max(rowid) FROM t4 EXCEPT SELECT max(rowid) FROM t5 |
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297 | ) |
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298 | } |
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299 | } {{}} |
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300 | } ;# ifcapable compound&&subquery |
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301 | |||
302 | # If there is a NULL in an aggregate max() or min(), ignore it. An |
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303 | # aggregate min() or max() will only return NULL if all values are NULL. |
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304 | # |
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305 | do_test minmax2-10.1 { |
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306 | execsql { |
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307 | CREATE TABLE t6(x); |
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308 | INSERT INTO t6 VALUES(1); |
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309 | INSERT INTO t6 VALUES(2); |
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310 | INSERT INTO t6 VALUES(NULL); |
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311 | SELECT coalesce(min(x),-1) FROM t6; |
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312 | } |
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313 | } {1} |
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314 | do_test minmax2-10.2 { |
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315 | execsql { |
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316 | SELECT max(x) FROM t6; |
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317 | } |
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318 | } {2} |
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319 | do_test minmax2-10.3 { |
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320 | execsql { |
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321 | CREATE INDEX i6 ON t6(x DESC); |
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322 | SELECT coalesce(min(x),-1) FROM t6; |
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323 | } |
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324 | } {1} |
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325 | do_test minmax2-10.4 { |
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326 | execsql { |
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327 | SELECT max(x) FROM t6; |
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328 | } |
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329 | } {2} |
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330 | do_test minmax2-10.5 { |
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331 | execsql { |
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332 | DELETE FROM t6 WHERE x NOT NULL; |
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333 | SELECT count(*) FROM t6; |
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334 | } |
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335 | } 1 |
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336 | do_test minmax2-10.6 { |
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337 | execsql { |
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338 | SELECT count(x) FROM t6; |
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339 | } |
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340 | } 0 |
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341 | ifcapable subquery { |
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342 | do_test minmax2-10.7 { |
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343 | execsql { |
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344 | SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6); |
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345 | } |
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346 | } {{} {}} |
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347 | } |
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348 | do_test minmax2-10.8 { |
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349 | execsql { |
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350 | SELECT min(x), max(x) FROM t6; |
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351 | } |
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352 | } {{} {}} |
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353 | do_test minmax2-10.9 { |
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354 | execsql { |
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355 | INSERT INTO t6 SELECT * FROM t6; |
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356 | INSERT INTO t6 SELECT * FROM t6; |
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357 | INSERT INTO t6 SELECT * FROM t6; |
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358 | INSERT INTO t6 SELECT * FROM t6; |
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359 | INSERT INTO t6 SELECT * FROM t6; |
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360 | INSERT INTO t6 SELECT * FROM t6; |
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361 | INSERT INTO t6 SELECT * FROM t6; |
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362 | INSERT INTO t6 SELECT * FROM t6; |
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363 | INSERT INTO t6 SELECT * FROM t6; |
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364 | INSERT INTO t6 SELECT * FROM t6; |
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365 | SELECT count(*) FROM t6; |
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366 | } |
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367 | } 1024 |
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368 | do_test minmax2-10.10 { |
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369 | execsql { |
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370 | SELECT count(x) FROM t6; |
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371 | } |
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372 | } 0 |
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373 | ifcapable subquery { |
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374 | do_test minmax2-10.11 { |
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375 | execsql { |
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376 | SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6); |
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377 | } |
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378 | } {{} {}} |
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379 | } |
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380 | do_test minmax2-10.12 { |
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381 | execsql { |
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382 | SELECT min(x), max(x) FROM t6; |
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383 | } |
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384 | } {{} {}} |
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385 | |||
386 | |||
387 | finish_test |