#pragma ident "%Z%%M% %I% %E% SMI" # 2001 November 6 # # 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 the LIMIT ... OFFSET ... clause # of SELECT statements. # # $Id: limit.test,v 1.11.2.1 2004/07/19 23:33:04 drh Exp $ set testdir [file dirname $argv0] source $testdir/tester.tcl # Build some test data # set fd [open data1.txt w] for {set i 1} {$i<=32} {incr i} { for {set j 0} {pow(2,$j)<$i} {incr j} {} puts $fd "[expr {32-$i}]\t[expr {10-$j}]" } close $fd execsql { CREATE TABLE t1(x int, y int); COPY t1 FROM 'data1.txt' } file delete data1.txt do_test limit-1.0 { execsql {SELECT count(*) FROM t1} } {32} do_test limit-1.1 { execsql {SELECT count(*) FROM t1 LIMIT 5} } {32} do_test limit-1.2.1 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 5} } {0 1 2 3 4} do_test limit-1.2.2 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 5 OFFSET 2} } {2 3 4 5 6} do_test limit-1.2.3 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 2, 5} } {2 3 4 5 6} do_test limit-1.3 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 5 OFFSET 5} } {5 6 7 8 9} do_test limit-1.4.1 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 50 OFFSET 30} } {30 31} do_test limit-1.4.2 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 30, 50} } {30 31} do_test limit-1.5 { execsql {SELECT x FROM t1 ORDER BY x LIMIT 50 OFFSET 50} } {} do_test limit-1.6 { execsql {SELECT * FROM t1 AS a, t1 AS b ORDER BY a.x, b.x LIMIT 5} } {0 5 0 5 0 5 1 5 0 5 2 5 0 5 3 5 0 5 4 5} do_test limit-1.7 { execsql {SELECT * FROM t1 AS a, t1 AS b ORDER BY a.x, b.x LIMIT 5 OFFSET 32} } {1 5 0 5 1 5 1 5 1 5 2 5 1 5 3 5 1 5 4 5} do_test limit-2.1 { execsql { CREATE VIEW v1 AS SELECT * FROM t1 LIMIT 2; SELECT count(*) FROM (SELECT * FROM v1); } } 2 do_test limit-2.2 { execsql { CREATE TABLE t2 AS SELECT * FROM t1 LIMIT 2; SELECT count(*) FROM t2; } } 2 do_test limit-2.3 { execsql { SELECT count(*) FROM t1 WHERE rowid IN (SELECT rowid FROM t1 LIMIT 2); } } 2 do_test limit-3.1 { execsql { SELECT z FROM (SELECT y*10+x AS z FROM t1 ORDER BY x LIMIT 10) ORDER BY z LIMIT 5; } } {50 51 52 53 54} do_test limit-4.1 { execsql { BEGIN; CREATE TABLE t3(x); INSERT INTO t3 SELECT x FROM t1 ORDER BY x LIMIT 10 OFFSET 1; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; END; SELECT count(*) FROM t3; } } {10240} do_test limit-4.2 { execsql { SELECT x FROM t3 LIMIT 2 OFFSET 10000 } } {10001 10002} do_test limit-4.3 { execsql { CREATE TABLE t4 AS SELECT x, 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x AS y FROM t3 LIMIT 1000; SELECT x FROM t4 ORDER BY y DESC LIMIT 1 OFFSET 999; } } {1000} do_test limit-5.1 { execsql { CREATE TABLE t5(x,y); INSERT INTO t5 SELECT x-y, x+y FROM t1 WHERE x BETWEEN 10 AND 15 ORDER BY x LIMIT 2; SELECT * FROM t5 ORDER BY x; } } {5 15 6 16} do_test limit-5.2 { execsql { DELETE FROM t5; INSERT INTO t5 SELECT x-y, x+y FROM t1 WHERE x BETWEEN 10 AND 15 ORDER BY x DESC LIMIT 2; SELECT * FROM t5 ORDER BY x; } } {9 19 10 20} do_test limit-5.3 { execsql { DELETE FROM t5; INSERT INTO t5 SELECT x-y, x+y FROM t1 WHERE x ORDER BY x DESC LIMIT 31; SELECT * FROM t5 ORDER BY x LIMIT 2; } } {-4 6 -3 7} do_test limit-5.4 { execsql { SELECT * FROM t5 ORDER BY x DESC, y DESC LIMIT 2; } } {21 41 21 39} do_test limit-5.5 { execsql { DELETE FROM t5; INSERT INTO t5 SELECT a.x*100+b.x, a.y*100+b.y FROM t1 AS a, t1 AS b ORDER BY 1, 2 LIMIT 1000; SELECT count(*), sum(x), sum(y), min(x), max(x), min(y), max(y) FROM t5; } } {1000 1528204 593161 0 3107 505 1005} # There is some contraversy about whether LIMIT 0 should be the same as # no limit at all or if LIMIT 0 should result in zero output rows. # do_test limit-6.1 { execsql { BEGIN; CREATE TABLE t6(a); INSERT INTO t6 VALUES(1); INSERT INTO t6 VALUES(2); INSERT INTO t6 SELECT a+2 FROM t6; COMMIT; SELECT * FROM t6; } } {1 2 3 4} do_test limit-6.2 { execsql { SELECT * FROM t6 LIMIT -1 OFFSET -1; } } {1 2 3 4} do_test limit-6.3 { execsql { SELECT * FROM t6 LIMIT 2 OFFSET -123; } } {1 2} do_test limit-6.4 { execsql { SELECT * FROM t6 LIMIT -432 OFFSET 2; } } {3 4} do_test limit-6.5 { execsql { SELECT * FROM t6 LIMIT -1 } } {1 2 3 4} do_test limit-6.6 { execsql { SELECT * FROM t6 LIMIT -1 OFFSET 1 } } {2 3 4} do_test limit-6.7 { execsql { SELECT * FROM t6 LIMIT 0 } } {} do_test limit-6.8 { execsql { SELECT * FROM t6 LIMIT 0 OFFSET 1 } } {} # Make sure LIMIT works well with compound SELECT statements. # Ticket #393 # do_test limit-7.1.1 { catchsql { SELECT x FROM t2 LIMIT 5 UNION ALL SELECT a FROM t6; } } {1 {LIMIT clause should come after UNION ALL not before}} do_test limit-7.1.2 { catchsql { SELECT x FROM t2 LIMIT 5 UNION SELECT a FROM t6; } } {1 {LIMIT clause should come after UNION not before}} do_test limit-7.1.3 { catchsql { SELECT x FROM t2 LIMIT 5 EXCEPT SELECT a FROM t6 LIMIT 3; } } {1 {LIMIT clause should come after EXCEPT not before}} do_test limit-7.1.4 { catchsql { SELECT x FROM t2 LIMIT 0,5 INTERSECT SELECT a FROM t6; } } {1 {LIMIT clause should come after INTERSECT not before}} do_test limit-7.2 { execsql { SELECT x FROM t2 UNION ALL SELECT a FROM t6 LIMIT 5; } } {31 30 1 2 3} do_test limit-7.3 { execsql { SELECT x FROM t2 UNION ALL SELECT a FROM t6 LIMIT 3 OFFSET 1; } } {30 1 2} do_test limit-7.4 { execsql { SELECT x FROM t2 UNION ALL SELECT a FROM t6 ORDER BY 1 LIMIT 3 OFFSET 1; } } {2 3 4} do_test limit-7.5 { execsql { SELECT x FROM t2 UNION SELECT x+2 FROM t2 LIMIT 2 OFFSET 1; } } {31 32} do_test limit-7.6 { execsql { SELECT x FROM t2 UNION SELECT x+2 FROM t2 ORDER BY 1 DESC LIMIT 2 OFFSET 1; } } {32 31} do_test limit-7.7 { execsql { SELECT a+9 FROM t6 EXCEPT SELECT y FROM t2 LIMIT 2; } } {11 12} do_test limit-7.8 { execsql { SELECT a+9 FROM t6 EXCEPT SELECT y FROM t2 ORDER BY 1 DESC LIMIT 2; } } {13 12} do_test limit-7.9 { execsql { SELECT a+26 FROM t6 INTERSECT SELECT x FROM t2 LIMIT 1; } } {30} do_test limit-7.10 { execsql { SELECT a+27 FROM t6 INTERSECT SELECT x FROM t2 LIMIT 1; } } {30} do_test limit-7.11 { execsql { SELECT a+27 FROM t6 INTERSECT SELECT x FROM t2 LIMIT 1 OFFSET 1; } } {31} do_test limit-7.12 { execsql { SELECT a+27 FROM t6 INTERSECT SELECT x FROM t2 ORDER BY 1 DESC LIMIT 1 OFFSET 1; } } {30} # Tests for limit in conjunction with distinct. The distinct should # occur before both the limit and the offset. Ticket #749. # do_test limit-8.1 { execsql { SELECT DISTINCT round(x/100) FROM t3 LIMIT 5; } } {0 1 2 3 4} do_test limit-8.2 { execsql { SELECT DISTINCT round(x/100) FROM t3 LIMIT 5 OFFSET 5; } } {5 6 7 8 9} do_test limit-8.3 { execsql { SELECT DISTINCT round(x/100) FROM t3 LIMIT 5 OFFSET 25; } } {25 26 27 28 29} finish_test