/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.
- #
- # $Id:$
- 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