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+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+# 2001 September 15
+#
+# 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 SELECT statements that contain
+# aggregate min() and max() functions and which are handled as
+# as a special case.
+#
+# $Id: minmax.test,v 1.9.2.2 2004/07/18 21:14:05 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test minmax-1.0 {
+ execsql {
+ BEGIN;
+ CREATE TABLE t1(x, y);
+ INSERT INTO t1 VALUES(1,1);
+ INSERT INTO t1 VALUES(2,2);
+ INSERT INTO t1 VALUES(3,2);
+ INSERT INTO t1 VALUES(4,3);
+ INSERT INTO t1 VALUES(5,3);
+ INSERT INTO t1 VALUES(6,3);
+ INSERT INTO t1 VALUES(7,3);
+ INSERT INTO t1 VALUES(8,4);
+ INSERT INTO t1 VALUES(9,4);
+ INSERT INTO t1 VALUES(10,4);
+ INSERT INTO t1 VALUES(11,4);
+ INSERT INTO t1 VALUES(12,4);
+ INSERT INTO t1 VALUES(13,4);
+ INSERT INTO t1 VALUES(14,4);
+ INSERT INTO t1 VALUES(15,4);
+ INSERT INTO t1 VALUES(16,5);
+ INSERT INTO t1 VALUES(17,5);
+ INSERT INTO t1 VALUES(18,5);
+ INSERT INTO t1 VALUES(19,5);
+ INSERT INTO t1 VALUES(20,5);
+ COMMIT;
+ SELECT DISTINCT y FROM t1 ORDER BY y;
+ }
+} {1 2 3 4 5}
+
+do_test minmax-1.1 {
+ set sqlite_search_count 0
+ execsql {SELECT min(x) FROM t1}
+} {1}
+do_test minmax-1.2 {
+ set sqlite_search_count
+} {19}
+do_test minmax-1.3 {
+ set sqlite_search_count 0
+ execsql {SELECT max(x) FROM t1}
+} {20}
+do_test minmax-1.4 {
+ set sqlite_search_count
+} {19}
+do_test minmax-1.5 {
+ execsql {CREATE INDEX t1i1 ON t1(x)}
+ set sqlite_search_count 0
+ execsql {SELECT min(x) FROM t1}
+} {1}
+do_test minmax-1.6 {
+ set sqlite_search_count
+} {2}
+do_test minmax-1.7 {
+ set sqlite_search_count 0
+ execsql {SELECT max(x) FROM t1}
+} {20}
+do_test minmax-1.8 {
+ set sqlite_search_count
+} {1}
+do_test minmax-1.9 {
+ set sqlite_search_count 0
+ execsql {SELECT max(y) FROM t1}
+} {5}
+do_test minmax-1.10 {
+ set sqlite_search_count
+} {19}
+
+do_test minmax-2.0 {
+ execsql {
+ CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
+ INSERT INTO t2 SELECT * FROM t1;
+ }
+ set sqlite_search_count 0
+ execsql {SELECT min(a) FROM t2}
+} {1}
+do_test minmax-2.1 {
+ set sqlite_search_count
+} {0}
+do_test minmax-2.2 {
+ set sqlite_search_count 0
+ execsql {SELECT max(a) FROM t2}
+} {20}
+do_test minmax-2.3 {
+ set sqlite_search_count
+} {0}
+
+do_test minmax-3.0 {
+ execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
+ set sqlite_search_count 0
+ execsql {SELECT max(a) FROM t2}
+} {21}
+do_test minmax-3.1 {
+ set sqlite_search_count
+} {0}
+do_test minmax-3.2 {
+ execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
+ set sqlite_search_count 0
+ execsql {
+ SELECT b FROM t2 WHERE a=(SELECT max(a) FROM t2)
+ }
+} {999}
+do_test minmax-3.3 {
+ set sqlite_search_count
+} {0}
+
+do_test minmax-4.1 {
+ execsql {
+ SELECT coalesce(min(x+0),-1), coalesce(max(x+0),-1) FROM
+ (SELECT * FROM t1 UNION SELECT NULL as 'x', NULL as 'y')
+ }
+} {1 20}
+do_test minmax-4.2 {
+ execsql {
+ SELECT y, sum(x) FROM
+ (SELECT null, y+1 FROM t1 UNION SELECT * FROM t1)
+ GROUP BY y ORDER BY y;
+ }
+} {1 1 2 5 3 22 4 92 5 90 6 0}
+do_test minmax-4.3 {
+ execsql {
+ SELECT y, count(x), count(*) FROM
+ (SELECT null, y+1 FROM t1 UNION SELECT * FROM t1)
+ GROUP BY y ORDER BY y;
+ }
+} {1 1 1 2 2 3 3 4 5 4 8 9 5 5 6 6 0 1}
+
+# Make sure the min(x) and max(x) optimizations work on empty tables
+# including empty tables with indices. Ticket #296.
+#
+do_test minmax-5.1 {
+ execsql {
+ CREATE TABLE t3(x INTEGER UNIQUE NOT NULL);
+ SELECT coalesce(min(x),999) FROM t3;
+ }
+} {999}
+do_test minmax-5.2 {
+ execsql {
+ SELECT coalesce(min(rowid),999) FROM t3;
+ }
+} {999}
+do_test minmax-5.3 {
+ execsql {
+ SELECT coalesce(max(x),999) FROM t3;
+ }
+} {999}
+do_test minmax-5.4 {
+ execsql {
+ SELECT coalesce(max(rowid),999) FROM t3;
+ }
+} {999}
+do_test minmax-5.5 {
+ execsql {
+ SELECT coalesce(max(rowid),999) FROM t3 WHERE rowid<25;
+ }
+} {999}
+
+# Make sure the min(x) and max(x) optimizations work when there
+# is a LIMIT clause. Ticket #396.
+#
+do_test minmax-6.1 {
+ execsql {
+ SELECT min(a) FROM t2 LIMIT 1
+ }
+} {1}
+do_test minmax-6.2 {
+ execsql {
+ SELECT max(a) FROM t2 LIMIT 3
+ }
+} {22}
+do_test minmax-6.3 {
+ execsql {
+ SELECT min(a) FROM t2 LIMIT 0,100
+ }
+} {1}
+do_test minmax-6.4 {
+ execsql {
+ SELECT max(a) FROM t2 LIMIT 1,100
+ }
+} {}
+do_test minmax-6.5 {
+ execsql {
+ SELECT min(x) FROM t3 LIMIT 1
+ }
+} {{}}
+do_test minmax-6.6 {
+ execsql {
+ SELECT max(x) FROM t3 LIMIT 0
+ }
+} {}
+do_test minmax-6.7 {
+ execsql {
+ SELECT max(a) FROM t2 LIMIT 0
+ }
+} {}
+
+# Make sure the max(x) and min(x) optimizations work for nested
+# queries. Ticket #587.
+#
+do_test minmax-7.1 {
+ execsql {
+ SELECT max(x) FROM t1;
+ }
+} 20
+do_test minmax-7.2 {
+ execsql {
+ SELECT * FROM (SELECT max(x) FROM t1);
+ }
+} 20
+do_test minmax-7.3 {
+ execsql {
+ SELECT min(x) FROM t1;
+ }
+} 1
+do_test minmax-7.4 {
+ execsql {
+ SELECT * FROM (SELECT min(x) FROM t1);
+ }
+} 1
+
+# Make sure min(x) and max(x) work correctly when the datatype is
+# TEXT instead of NUMERIC. Ticket #623.
+#
+do_test minmax-8.1 {
+ execsql {
+ CREATE TABLE t4(a TEXT);
+ INSERT INTO t4 VALUES('1234');
+ INSERT INTO t4 VALUES('234');
+ INSERT INTO t4 VALUES('34');
+ SELECT min(a), max(a) FROM t4;
+ }
+} {1234 34}
+do_test minmax-8.2 {
+ execsql {
+ CREATE TABLE t5(a INTEGER);
+ INSERT INTO t5 VALUES('1234');
+ INSERT INTO t5 VALUES('234');
+ INSERT INTO t5 VALUES('34');
+ SELECT min(a), max(a) FROM t5;
+ }
+} {34 1234}
+
+# Ticket #658: Test the min()/max() optimization when the FROM clause
+# is a subquery.
+#
+do_test minmax-9.1 {
+ execsql {
+ SELECT max(rowid) FROM (
+ SELECT max(rowid) FROM t4 UNION SELECT max(rowid) FROM t5
+ )
+ }
+} {1}
+do_test minmax-9.2 {
+ execsql {
+ SELECT max(rowid) FROM (
+ SELECT max(rowid) FROM t4 EXCEPT SELECT max(rowid) FROM t5
+ )
+ }
+} {{}}
+
+# If there is a NULL in an aggregate max() or min(), ignore it. An
+# aggregate min() or max() will only return NULL if all values are NULL.
+#
+do_test minmax-10.1 {
+ execsql {
+ CREATE TABLE t6(x);
+ INSERT INTO t6 VALUES(1);
+ INSERT INTO t6 VALUES(2);
+ INSERT INTO t6 VALUES(NULL);
+ SELECT coalesce(min(x),-1) FROM t6;
+ }
+} {1}
+do_test minmax-10.2 {
+ execsql {
+ SELECT max(x) FROM t6;
+ }
+} {2}
+do_test minmax-10.3 {
+ execsql {
+ CREATE INDEX i6 ON t6(x);
+ SELECT coalesce(min(x),-1) FROM t6;
+ }
+} {1}
+do_test minmax-10.4 {
+ execsql {
+ SELECT max(x) FROM t6;
+ }
+} {2}
+do_test minmax-10.5 {
+ execsql {
+ DELETE FROM t6 WHERE x NOT NULL;
+ SELECT count(*) FROM t6;
+ }
+} 1
+do_test minmax-10.6 {
+ execsql {
+ SELECT count(x) FROM t6;
+ }
+} 0
+do_test minmax-10.7 {
+ execsql {
+ SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
+ }
+} {{} {}}
+do_test minmax-10.8 {
+ execsql {
+ SELECT min(x), max(x) FROM t6;
+ }
+} {{} {}}
+do_test minmax-10.9 {
+ execsql {
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ SELECT count(*) FROM t6;
+ }
+} 1024
+do_test minmax-10.10 {
+ execsql {
+ SELECT count(x) FROM t6;
+ }
+} 0
+do_test minmax-10.11 {
+ execsql {
+ SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
+ }
+} {{} {}}
+do_test minmax-10.12 {
+ execsql {
+ SELECT min(x), max(x) FROM t6;
+ }
+} {{} {}}
+
+finish_test
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-14 11:31:07 +0000