/trunk/test/subselect.test |
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# 2001 September 15 |
# |
# The author disclaims copyright to this source code. In place of |
# a legal notice, here is a blessing: |
# |
# May you do good and not evil. |
# May you find forgiveness for yourself and forgive others. |
# May you share freely, never taking more than you give. |
# |
#*********************************************************************** |
# This file implements regression tests for SQLite library. The |
# focus of this file is testing SELECT statements that are part of |
# expressions. |
# |
# $Id: subselect.test,v 1.16 2008/08/04 03:51:24 danielk1977 Exp $ |
|
set testdir [file dirname $argv0] |
source $testdir/tester.tcl |
|
# Omit this whole file if the library is build without subquery support. |
ifcapable !subquery { |
finish_test |
return |
} |
|
# Basic sanity checking. Try a simple subselect. |
# |
do_test subselect-1.1 { |
execsql { |
CREATE TABLE t1(a int, b int); |
INSERT INTO t1 VALUES(1,2); |
INSERT INTO t1 VALUES(3,4); |
INSERT INTO t1 VALUES(5,6); |
} |
execsql {SELECT * FROM t1 WHERE a = (SELECT count(*) FROM t1)} |
} {3 4} |
|
# Try a select with more than one result column. |
# |
do_test subselect-1.2 { |
set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg] |
lappend v $msg |
} {1 {only a single result allowed for a SELECT that is part of an expression}} |
|
# A subselect without an aggregate. |
# |
do_test subselect-1.3a { |
execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)} |
} {2} |
do_test subselect-1.3b { |
execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=4)} |
} {4} |
do_test subselect-1.3c { |
execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=6)} |
} {6} |
do_test subselect-1.3d { |
execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=8)} |
} {} |
ifcapable compound { |
do_test subselect-1.3e { |
execsql { |
SELECT b FROM t1 |
WHERE a = (SELECT a FROM t1 UNION SELECT b FROM t1 ORDER BY 1); |
} |
} {2} |
} |
|
# What if the subselect doesn't return any value. We should get |
# NULL as the result. Check it out. |
# |
do_test subselect-1.4 { |
execsql {SELECT b from t1 where a = coalesce((SELECT a FROM t1 WHERE b=5),1)} |
} {2} |
|
# Try multiple subselects within a single expression. |
# |
do_test subselect-1.5 { |
execsql { |
CREATE TABLE t2(x int, y int); |
INSERT INTO t2 VALUES(1,2); |
INSERT INTO t2 VALUES(2,4); |
INSERT INTO t2 VALUES(3,8); |
INSERT INTO t2 VALUES(4,16); |
} |
execsql { |
SELECT y from t2 |
WHERE x = (SELECT sum(b) FROM t1 where a notnull) - (SELECT sum(a) FROM t1) |
} |
} {8} |
|
# Try something useful. Delete every entry from t2 where the |
# x value is less than half of the maximum. |
# |
do_test subselect-1.6 { |
execsql {DELETE FROM t2 WHERE x < 0.5*(SELECT max(x) FROM t2)} |
execsql {SELECT x FROM t2 ORDER BY x} |
} {2 3 4} |
|
# Make sure sorting works for SELECTs there used as a scalar expression. |
# |
do_test subselect-2.1 { |
execsql { |
SELECT (SELECT a FROM t1 ORDER BY a), (SELECT a FROM t1 ORDER BY a DESC) |
} |
} {1 5} |
do_test subselect-2.2 { |
execsql { |
SELECT 1 IN (SELECT a FROM t1 ORDER BY a); |
} |
} {1} |
do_test subselect-2.3 { |
execsql { |
SELECT 2 IN (SELECT a FROM t1 ORDER BY a DESC); |
} |
} {0} |
|
# Verify that the ORDER BY clause is honored in a subquery. |
# |
ifcapable compound { |
do_test subselect-3.1 { |
execsql { |
CREATE TABLE t3(x int); |
INSERT INTO t3 SELECT a FROM t1 UNION ALL SELECT b FROM t1; |
SELECT * FROM t3 ORDER BY x; |
} |
} {1 2 3 4 5 6} |
} ;# ifcapable compound |
ifcapable !compound { |
do_test subselect-3.1 { |
execsql { |
CREATE TABLE t3(x int); |
INSERT INTO t3 SELECT a FROM t1; |
INSERT INTO t3 SELECT b FROM t1; |
SELECT * FROM t3 ORDER BY x; |
} |
} {1 2 3 4 5 6} |
} ;# ifcapable !compound |
|
do_test subselect-3.2 { |
execsql { |
SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x LIMIT 2); |
} |
} {3} |
do_test subselect-3.3 { |
execsql { |
SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x DESC LIMIT 2); |
} |
} {11} |
do_test subselect-3.4 { |
execsql { |
SELECT (SELECT x FROM t3 ORDER BY x); |
} |
} {1} |
do_test subselect-3.5 { |
execsql { |
SELECT (SELECT x FROM t3 ORDER BY x DESC); |
} |
} {6} |
do_test subselect-3.6 { |
execsql { |
SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1); |
} |
} {1} |
do_test subselect-3.7 { |
execsql { |
SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1); |
} |
} {6} |
do_test subselect-3.8 { |
execsql { |
SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1 OFFSET 2); |
} |
} {3} |
do_test subselect-3.9 { |
execsql { |
SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2); |
} |
} {4} |
do_test subselect-3.10 { |
execsql { |
SELECT x FROM t3 WHERE x IN |
(SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2); |
} |
} {4} |
|
# Ticket #2295. |
# Make sure type affinities work correctly on subqueries with |
# an ORDER BY clause. |
# |
do_test subselect-4.1 { |
execsql { |
CREATE TABLE t4(a TEXT, b TEXT); |
INSERT INTO t4 VALUES('a','1'); |
INSERT INTO t4 VALUES('b','2'); |
INSERT INTO t4 VALUES('c','3'); |
SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b); |
} |
} {a b c} |
do_test subselect-4.2 { |
execsql { |
SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b LIMIT 1); |
} |
} {a} |
do_test subselect-4.3 { |
execsql { |
SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b DESC LIMIT 1); |
} |
} {c} |
|
finish_test |