# 2005 January 19 # # 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 script is testing correlated subqueries # # $Id: subquery.test,v 1.17 2009/01/09 01:12:28 drh Exp $ # set testdir [file dirname $argv0] source $testdir/tester.tcl ifcapable !subquery { finish_test return } do_test subquery-1.1 { execsql { BEGIN; CREATE TABLE t1(a,b); INSERT INTO t1 VALUES(1,2); INSERT INTO t1 VALUES(3,4); INSERT INTO t1 VALUES(5,6); INSERT INTO t1 VALUES(7,8); CREATE TABLE t2(x,y); INSERT INTO t2 VALUES(1,1); INSERT INTO t2 VALUES(3,9); INSERT INTO t2 VALUES(5,25); INSERT INTO t2 VALUES(7,49); COMMIT; } execsql { SELECT a, (SELECT y FROM t2 WHERE x=a) FROM t1 WHERE b<8 } } {1 1 3 9 5 25} do_test subquery-1.2 { execsql { UPDATE t1 SET b=b+(SELECT y FROM t2 WHERE x=a); SELECT * FROM t1; } } {1 3 3 13 5 31 7 57} do_test subquery-1.3 { execsql { SELECT b FROM t1 WHERE EXISTS(SELECT * FROM t2 WHERE y=a) } } {3} do_test subquery-1.4 { execsql { SELECT b FROM t1 WHERE NOT EXISTS(SELECT * FROM t2 WHERE y=a) } } {13 31 57} # Simple tests to make sure correlated subqueries in WHERE clauses # are used by the query optimizer correctly. do_test subquery-1.5 { execsql { SELECT a, x FROM t1, t2 WHERE t1.a = (SELECT x); } } {1 1 3 3 5 5 7 7} do_test subquery-1.6 { execsql { CREATE INDEX i1 ON t1(a); SELECT a, x FROM t1, t2 WHERE t1.a = (SELECT x); } } {1 1 3 3 5 5 7 7} do_test subquery-1.7 { execsql { SELECT a, x FROM t2, t1 WHERE t1.a = (SELECT x); } } {1 1 3 3 5 5 7 7} # Try an aggregate in both the subquery and the parent query. do_test subquery-1.8 { execsql { SELECT count(*) FROM t1 WHERE a > (SELECT count(*) FROM t2); } } {2} # Test a correlated subquery disables the "only open the index" optimization. do_test subquery-1.9.1 { execsql { SELECT (y*2)>b FROM t1, t2 WHERE a=x; } } {0 1 1 1} do_test subquery-1.9.2 { execsql { SELECT a FROM t1 WHERE (SELECT (y*2)>b FROM t2 WHERE a=x); } } {3 5 7} # Test that the flattening optimization works with subquery expressions. do_test subquery-1.10.1 { execsql { SELECT (SELECT a), b FROM t1; } } {1 3 3 13 5 31 7 57} do_test subquery-1.10.2 { execsql { SELECT * FROM (SELECT (SELECT a), b FROM t1); } } {1 3 3 13 5 31 7 57} do_test subquery-1.10.3 { execsql { SELECT * FROM (SELECT (SELECT sum(a) FROM t1)); } } {16} do_test subquery-1.10.4 { execsql { CREATE TABLE t5 (val int, period text PRIMARY KEY); INSERT INTO t5 VALUES(5, '2001-3'); INSERT INTO t5 VALUES(10, '2001-4'); INSERT INTO t5 VALUES(15, '2002-1'); INSERT INTO t5 VALUES(5, '2002-2'); INSERT INTO t5 VALUES(10, '2002-3'); INSERT INTO t5 VALUES(15, '2002-4'); INSERT INTO t5 VALUES(10, '2003-1'); INSERT INTO t5 VALUES(5, '2003-2'); INSERT INTO t5 VALUES(25, '2003-3'); INSERT INTO t5 VALUES(5, '2003-4'); SELECT period, vsum FROM (SELECT a.period, (select sum(val) from t5 where period between a.period and '2002-4') vsum FROM t5 a where a.period between '2002-1' and '2002-4') WHERE vsum < 45 ; } } {2002-2 30 2002-3 25 2002-4 15} do_test subquery-1.10.5 { execsql { SELECT period, vsum from (select a.period, (select sum(val) from t5 where period between a.period and '2002-4') vsum FROM t5 a where a.period between '2002-1' and '2002-4') WHERE vsum < 45 ; } } {2002-2 30 2002-3 25 2002-4 15} do_test subquery-1.10.6 { execsql { DROP TABLE t5; } } {} #------------------------------------------------------------------ # The following test cases - subquery-2.* - are not logically # organized. They're here largely because they were failing during # one stage of development of sub-queries. # do_test subquery-2.1 { execsql { SELECT (SELECT 10); } } {10} do_test subquery-2.2.1 { execsql { CREATE TABLE t3(a PRIMARY KEY, b); INSERT INTO t3 VALUES(1, 2); INSERT INTO t3 VALUES(3, 1); } } {} do_test subquery-2.2.2 { execsql { SELECT * FROM t3 WHERE a IN (SELECT b FROM t3); } } {1 2} do_test subquery-2.2.3 { execsql { DROP TABLE t3; } } {} do_test subquery-2.3.1 { execsql { CREATE TABLE t3(a TEXT); INSERT INTO t3 VALUES('10'); } } {} do_test subquery-2.3.2 { execsql { SELECT a IN (10.0, 20) FROM t3; } } {0} do_test subquery-2.3.3 { execsql { DROP TABLE t3; } } {} do_test subquery-2.4.1 { execsql { CREATE TABLE t3(a TEXT); INSERT INTO t3 VALUES('XX'); } } {} do_test subquery-2.4.2 { execsql { SELECT count(*) FROM t3 WHERE a IN (SELECT 'XX') } } {1} do_test subquery-2.4.3 { execsql { DROP TABLE t3; } } {} do_test subquery-2.5.1 { execsql { CREATE TABLE t3(a INTEGER); INSERT INTO t3 VALUES(10); CREATE TABLE t4(x TEXT); INSERT INTO t4 VALUES('10.0'); } } {} do_test subquery-2.5.2 { # In the expr "x IN (SELECT a FROM t3)" the RHS of the IN operator # has text affinity and the LHS has integer affinity. The rule is # that we try to convert both sides to an integer before doing the # comparision. Hence, the integer value 10 in t3 will compare equal # to the string value '10.0' in t4 because the t4 value will be # converted into an integer. execsql { SELECT * FROM t4 WHERE x IN (SELECT a FROM t3); } } {10.0} do_test subquery-2.5.3.1 { # The t4i index cannot be used to resolve the "x IN (...)" constraint # because the constraint has integer affinity but t4i has text affinity. execsql { CREATE INDEX t4i ON t4(x); SELECT * FROM t4 WHERE x IN (SELECT a FROM t3); } } {10.0} do_test subquery-2.5.3.2 { # Verify that the t4i index was not used in the previous query set ::sqlite_query_plan } {t4 {}} do_test subquery-2.5.4 { execsql { DROP TABLE t3; DROP TABLE t4; } } {} #------------------------------------------------------------------ # The following test cases - subquery-3.* - test tickets that # were raised during development of correlated subqueries. # # Ticket 1083 ifcapable view { do_test subquery-3.1 { catchsql { DROP TABLE t1; } catchsql { DROP TABLE t2; } execsql { CREATE TABLE t1(a,b); INSERT INTO t1 VALUES(1,2); CREATE VIEW v1 AS SELECT b FROM t1 WHERE a>0; CREATE TABLE t2(p,q); INSERT INTO t2 VALUES(2,9); SELECT * FROM v1 WHERE EXISTS(SELECT * FROM t2 WHERE p=v1.b); } } {2} do_test subquery-3.1.1 { execsql { SELECT * FROM v1 WHERE EXISTS(SELECT 1); } } {2} } else { catchsql { DROP TABLE t1; } catchsql { DROP TABLE t2; } execsql { CREATE TABLE t1(a,b); INSERT INTO t1 VALUES(1,2); CREATE TABLE t2(p,q); INSERT INTO t2 VALUES(2,9); } } # Ticket 1084 do_test subquery-3.2 { catchsql { CREATE TABLE t1(a,b); INSERT INTO t1 VALUES(1,2); } execsql { SELECT (SELECT t1.a) FROM t1; } } {1} # Test Cases subquery-3.3.* test correlated subqueries where the # parent query is an aggregate query. Ticket #1105 is an example # of such a query. # do_test subquery-3.3.1 { execsql { SELECT a, (SELECT b) FROM t1 GROUP BY a; } } {1 2} do_test subquery-3.3.2 { catchsql {DROP TABLE t2} execsql { CREATE TABLE t2(c, d); INSERT INTO t2 VALUES(1, 'one'); INSERT INTO t2 VALUES(2, 'two'); SELECT a, (SELECT d FROM t2 WHERE a=c) FROM t1 GROUP BY a; } } {1 one} do_test subquery-3.3.3 { execsql { INSERT INTO t1 VALUES(2, 4); SELECT max(a), (SELECT d FROM t2 WHERE a=c) FROM t1; } } {2 two} do_test subquery-3.3.4 { execsql { SELECT a, (SELECT (SELECT d FROM t2 WHERE a=c)) FROM t1 GROUP BY a; } } {1 one 2 two} do_test subquery-3.3.5 { execsql { SELECT a, (SELECT count(*) FROM t2 WHERE a=c) FROM t1; } } {1 1 2 1} #------------------------------------------------------------------ # These tests - subquery-4.* - use the TCL statement cache to try # and expose bugs to do with re-using statements that have been # passed to sqlite3_reset(). # # One problem was that VDBE memory cells were not being initialised # to NULL on the second and subsequent executions. # do_test subquery-4.1.1 { execsql { SELECT (SELECT a FROM t1); } } {1} do_test subquery-4.2 { execsql { DELETE FROM t1; SELECT (SELECT a FROM t1); } } {{}} do_test subquery-4.2.1 { execsql { CREATE TABLE t3(a PRIMARY KEY); INSERT INTO t3 VALUES(10); } execsql {INSERT INTO t3 VALUES((SELECT max(a) FROM t3)+1)} } {} do_test subquery-4.2.2 { execsql {INSERT INTO t3 VALUES((SELECT max(a) FROM t3)+1)} } {} #------------------------------------------------------------------ # The subquery-5.* tests make sure string literals in double-quotes # are handled efficiently. Double-quote literals are first checked # to see if they match any column names. If there is not column name # match then those literals are used a string constants. When a # double-quoted string appears, we want to make sure that the search # for a matching column name did not cause an otherwise static subquery # to become a dynamic (correlated) subquery. # do_test subquery-5.1 { proc callcntproc {n} { incr ::callcnt return $n } set callcnt 0 db function callcnt callcntproc execsql { CREATE TABLE t4(x,y); INSERT INTO t4 VALUES('one',1); INSERT INTO t4 VALUES('two',2); INSERT INTO t4 VALUES('three',3); INSERT INTO t4 VALUES('four',4); CREATE TABLE t5(a,b); INSERT INTO t5 VALUES(1,11); INSERT INTO t5 VALUES(2,22); INSERT INTO t5 VALUES(3,33); INSERT INTO t5 VALUES(4,44); SELECT b FROM t5 WHERE a IN (SELECT callcnt(y)+0 FROM t4 WHERE x="two") } } {22} do_test subquery-5.2 { # This is the key test. The subquery should have only run once. If # The double-quoted identifier "two" were causing the subquery to be # processed as a correlated subquery, then it would have run 4 times. set callcnt } {1} # Ticket #1380. Make sure correlated subqueries on an IN clause work # correctly when the left-hand side of the IN operator is constant. # do_test subquery-6.1 { set callcnt 0 execsql { SELECT x FROM t4 WHERE 1 IN (SELECT callcnt(count(*)) FROM t5 WHERE a=y) } } {one two three four} do_test subquery-6.2 { set callcnt } {4} do_test subquery-6.3 { set callcnt 0 execsql { SELECT x FROM t4 WHERE 1 IN (SELECT callcnt(count(*)) FROM t5 WHERE a=1) } } {one two three four} do_test subquery-6.4 { set callcnt } {1} if 0 { ############# disable until we get #2652 fixed # Ticket #2652. Allow aggregate functions of outer queries inside # a non-aggregate subquery. # do_test subquery-7.1 { execsql { CREATE TABLE t7(c7); INSERT INTO t7 VALUES(1); INSERT INTO t7 VALUES(2); INSERT INTO t7 VALUES(3); CREATE TABLE t8(c8); INSERT INTO t8 VALUES(100); INSERT INTO t8 VALUES(200); INSERT INTO t8 VALUES(300); CREATE TABLE t9(c9); INSERT INTO t9 VALUES(10000); INSERT INTO t9 VALUES(20000); INSERT INTO t9 VALUES(30000); SELECT (SELECT c7+c8 FROM t7) FROM t8; } } {101 201 301} do_test subquery-7.2 { execsql { SELECT (SELECT max(c7)+c8 FROM t7) FROM t8; } } {103 203 303} do_test subquery-7.3 { execsql { SELECT (SELECT c7+max(c8) FROM t8) FROM t7 } } {301} do_test subquery-7.4 { execsql { SELECT (SELECT max(c7)+max(c8) FROM t8) FROM t7 } } {303} do_test subquery-7.5 { execsql { SELECT (SELECT c8 FROM t8 WHERE rowid=max(c7)) FROM t7 } } {300} do_test subquery-7.6 { execsql { SELECT (SELECT (SELECT max(c7+c8+c9) FROM t9) FROM t8) FROM t7 } } {30101 30102 30103} do_test subquery-7.7 { execsql { SELECT (SELECT (SELECT c7+max(c8+c9) FROM t9) FROM t8) FROM t7 } } {30101 30102 30103} do_test subquery-7.8 { execsql { SELECT (SELECT (SELECT max(c7)+c8+c9 FROM t9) FROM t8) FROM t7 } } {10103} do_test subquery-7.9 { execsql { SELECT (SELECT (SELECT c7+max(c8)+c9 FROM t9) FROM t8) FROM t7 } } {10301 10302 10303} do_test subquery-7.10 { execsql { SELECT (SELECT (SELECT c7+c8+max(c9) FROM t9) FROM t8) FROM t7 } } {30101 30102 30103} do_test subquery-7.11 { execsql { SELECT (SELECT (SELECT max(c7)+max(c8)+max(c9) FROM t9) FROM t8) FROM t7 } } {30303} } ;############# Disabled finish_test