87 lines
2.4 KiB
Plaintext
87 lines
2.4 KiB
Plaintext
# 2001 September 15
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this file is testing SELECT statements that are part of
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# expressions.
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#
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# $Id: subselect.test,v 1.4 2001/09/16 00:13:28 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Basic sanity checking. Try a simple subselect.
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#
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do_test subselect-1.1 {
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execsql {
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CREATE TABLE t1(a int, b int);
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INSERT INTO t1 VALUES(1,2);
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INSERT INTO t1 VALUES(3,4);
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INSERT INTO t1 VALUES(5,6);
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}
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execsql {SELECT * FROM t1 WHERE a = (SELECT count(*) FROM t1)}
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} {3 4}
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# Try a select with more than one result column.
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#
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do_test subselect-1.2 {
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set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg]
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lappend v $msg
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} {1 {only a single result allowed for a SELECT that is part of an expression}}
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# A subselect without an aggregate.
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#
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do_test subselect-1.3a {
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execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)}
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} {2}
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do_test subselect-1.3b {
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execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=4)}
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} {4}
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do_test subselect-1.3c {
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execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=6)}
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} {6}
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do_test subselect-1.3c {
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execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=8)}
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} {}
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# What if the subselect doesn't return any value. We should get
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# NULL as the result. Check it out.
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#
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do_test subselect-1.4 {
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execsql {INSERT INTO t1 VALUES(NULL,8)}
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execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=5)}
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} {8}
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# Try multiple subselects within a single expression.
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#
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do_test subselect-1.5 {
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execsql {
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CREATE TABLE t2(x int, y int);
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INSERT INTO t2 VALUES(1,2);
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INSERT INTO t2 VALUES(2,4);
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INSERT INTO t2 VALUES(3,8);
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INSERT INTO t2 VALUES(4,16);
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}
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execsql {
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SELECT y from t2
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WHERE x = (SELECT sum(b) FROM t1 where a notnull) - (SELECT sum(a) FROM t1)
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}
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} {8}
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# Try something useful. Delete every entry from t2 where the
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# x value is less than half of the maximum.
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#
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do_test subselect-1.6 {
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execsql {DELETE FROM t2 WHERE x < 0.5*(SELECT max(x) FROM t2)}
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execsql {SELECT x FROM t2 ORDER BY x}
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} {2 3 4}
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finish_test
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