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+
+#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
generated by cgit v1.2.3 (git 2.39.1) at 2025-06-02 14:29:35 +0000