# 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.tcldo_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;  }} 20do_test minmax-7.2 {  execsql {    SELECT * FROM (SELECT max(x) FROM t1);  }} 20do_test minmax-7.3 {  execsql {    SELECT min(x) FROM t1;  }} 1do_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;  }} 1do_test minmax-10.6 {  execsql {    SELECT count(x) FROM t6;  }} 0do_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;  }} 1024do_test minmax-10.10 {  execsql {    SELECT count(x) FROM t6;  }} 0do_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