# 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 2004/03/13 14:00:37 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
} {1}
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
)
}
} {{}}
finish_test