Annotation of embedaddon/sqlite3/test/subselect.test, revision 1.1
1.1 ! misho 1: # 2001 September 15
! 2: #
! 3: # The author disclaims copyright to this source code. In place of
! 4: # a legal notice, here is a blessing:
! 5: #
! 6: # May you do good and not evil.
! 7: # May you find forgiveness for yourself and forgive others.
! 8: # May you share freely, never taking more than you give.
! 9: #
! 10: #***********************************************************************
! 11: # This file implements regression tests for SQLite library. The
! 12: # focus of this file is testing SELECT statements that are part of
! 13: # expressions.
! 14: #
! 15: # $Id: subselect.test,v 1.16 2008/08/04 03:51:24 danielk1977 Exp $
! 16:
! 17: set testdir [file dirname $argv0]
! 18: source $testdir/tester.tcl
! 19:
! 20: # Omit this whole file if the library is build without subquery support.
! 21: ifcapable !subquery {
! 22: finish_test
! 23: return
! 24: }
! 25:
! 26: # Basic sanity checking. Try a simple subselect.
! 27: #
! 28: do_test subselect-1.1 {
! 29: execsql {
! 30: CREATE TABLE t1(a int, b int);
! 31: INSERT INTO t1 VALUES(1,2);
! 32: INSERT INTO t1 VALUES(3,4);
! 33: INSERT INTO t1 VALUES(5,6);
! 34: }
! 35: execsql {SELECT * FROM t1 WHERE a = (SELECT count(*) FROM t1)}
! 36: } {3 4}
! 37:
! 38: # Try a select with more than one result column.
! 39: #
! 40: do_test subselect-1.2 {
! 41: set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg]
! 42: lappend v $msg
! 43: } {1 {only a single result allowed for a SELECT that is part of an expression}}
! 44:
! 45: # A subselect without an aggregate.
! 46: #
! 47: do_test subselect-1.3a {
! 48: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)}
! 49: } {2}
! 50: do_test subselect-1.3b {
! 51: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=4)}
! 52: } {4}
! 53: do_test subselect-1.3c {
! 54: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=6)}
! 55: } {6}
! 56: do_test subselect-1.3d {
! 57: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=8)}
! 58: } {}
! 59: ifcapable compound {
! 60: do_test subselect-1.3e {
! 61: execsql {
! 62: SELECT b FROM t1
! 63: WHERE a = (SELECT a FROM t1 UNION SELECT b FROM t1 ORDER BY 1);
! 64: }
! 65: } {2}
! 66: }
! 67:
! 68: # What if the subselect doesn't return any value. We should get
! 69: # NULL as the result. Check it out.
! 70: #
! 71: do_test subselect-1.4 {
! 72: execsql {SELECT b from t1 where a = coalesce((SELECT a FROM t1 WHERE b=5),1)}
! 73: } {2}
! 74:
! 75: # Try multiple subselects within a single expression.
! 76: #
! 77: do_test subselect-1.5 {
! 78: execsql {
! 79: CREATE TABLE t2(x int, y int);
! 80: INSERT INTO t2 VALUES(1,2);
! 81: INSERT INTO t2 VALUES(2,4);
! 82: INSERT INTO t2 VALUES(3,8);
! 83: INSERT INTO t2 VALUES(4,16);
! 84: }
! 85: execsql {
! 86: SELECT y from t2
! 87: WHERE x = (SELECT sum(b) FROM t1 where a notnull) - (SELECT sum(a) FROM t1)
! 88: }
! 89: } {8}
! 90:
! 91: # Try something useful. Delete every entry from t2 where the
! 92: # x value is less than half of the maximum.
! 93: #
! 94: do_test subselect-1.6 {
! 95: execsql {DELETE FROM t2 WHERE x < 0.5*(SELECT max(x) FROM t2)}
! 96: execsql {SELECT x FROM t2 ORDER BY x}
! 97: } {2 3 4}
! 98:
! 99: # Make sure sorting works for SELECTs there used as a scalar expression.
! 100: #
! 101: do_test subselect-2.1 {
! 102: execsql {
! 103: SELECT (SELECT a FROM t1 ORDER BY a), (SELECT a FROM t1 ORDER BY a DESC)
! 104: }
! 105: } {1 5}
! 106: do_test subselect-2.2 {
! 107: execsql {
! 108: SELECT 1 IN (SELECT a FROM t1 ORDER BY a);
! 109: }
! 110: } {1}
! 111: do_test subselect-2.3 {
! 112: execsql {
! 113: SELECT 2 IN (SELECT a FROM t1 ORDER BY a DESC);
! 114: }
! 115: } {0}
! 116:
! 117: # Verify that the ORDER BY clause is honored in a subquery.
! 118: #
! 119: ifcapable compound {
! 120: do_test subselect-3.1 {
! 121: execsql {
! 122: CREATE TABLE t3(x int);
! 123: INSERT INTO t3 SELECT a FROM t1 UNION ALL SELECT b FROM t1;
! 124: SELECT * FROM t3 ORDER BY x;
! 125: }
! 126: } {1 2 3 4 5 6}
! 127: } ;# ifcapable compound
! 128: ifcapable !compound {
! 129: do_test subselect-3.1 {
! 130: execsql {
! 131: CREATE TABLE t3(x int);
! 132: INSERT INTO t3 SELECT a FROM t1;
! 133: INSERT INTO t3 SELECT b FROM t1;
! 134: SELECT * FROM t3 ORDER BY x;
! 135: }
! 136: } {1 2 3 4 5 6}
! 137: } ;# ifcapable !compound
! 138:
! 139: do_test subselect-3.2 {
! 140: execsql {
! 141: SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x LIMIT 2);
! 142: }
! 143: } {3}
! 144: do_test subselect-3.3 {
! 145: execsql {
! 146: SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x DESC LIMIT 2);
! 147: }
! 148: } {11}
! 149: do_test subselect-3.4 {
! 150: execsql {
! 151: SELECT (SELECT x FROM t3 ORDER BY x);
! 152: }
! 153: } {1}
! 154: do_test subselect-3.5 {
! 155: execsql {
! 156: SELECT (SELECT x FROM t3 ORDER BY x DESC);
! 157: }
! 158: } {6}
! 159: do_test subselect-3.6 {
! 160: execsql {
! 161: SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1);
! 162: }
! 163: } {1}
! 164: do_test subselect-3.7 {
! 165: execsql {
! 166: SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1);
! 167: }
! 168: } {6}
! 169: do_test subselect-3.8 {
! 170: execsql {
! 171: SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1 OFFSET 2);
! 172: }
! 173: } {3}
! 174: do_test subselect-3.9 {
! 175: execsql {
! 176: SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2);
! 177: }
! 178: } {4}
! 179: do_test subselect-3.10 {
! 180: execsql {
! 181: SELECT x FROM t3 WHERE x IN
! 182: (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2);
! 183: }
! 184: } {4}
! 185:
! 186: # Ticket #2295.
! 187: # Make sure type affinities work correctly on subqueries with
! 188: # an ORDER BY clause.
! 189: #
! 190: do_test subselect-4.1 {
! 191: execsql {
! 192: CREATE TABLE t4(a TEXT, b TEXT);
! 193: INSERT INTO t4 VALUES('a','1');
! 194: INSERT INTO t4 VALUES('b','2');
! 195: INSERT INTO t4 VALUES('c','3');
! 196: SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b);
! 197: }
! 198: } {a b c}
! 199: do_test subselect-4.2 {
! 200: execsql {
! 201: SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b LIMIT 1);
! 202: }
! 203: } {a}
! 204: do_test subselect-4.3 {
! 205: execsql {
! 206: SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b DESC LIMIT 1);
! 207: }
! 208: } {c}
! 209:
! 210: finish_test
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