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Merge mysql.com:/home/kgeorge/mysql/4.1/B16458

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into  mysql.com:/home/kgeorge/mysql/5.0/B16458


sql/sql_select.cc:
  Auto merged
mysql-test/r/distinct.result:
  merge 4.1->5.0
mysql-test/t/distinct.test:
  merge 4.1->5.0
This commit is contained in:
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2006-06-27 17:59:49 +03:00
parent d0412ab8e0 4b36c1d8ff
commit 6a4ec2e99d
3 changed files with 247 additions and 0 deletions
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51
mysql-test/r/distinct.result
View File

@ -504,6 +504,57 @@ a 2 b
2 2 4
3 2 5
DROP TABLE t1,t2;
CREATE TABLE t1(a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1), (2,1), (3,1);
EXPLAIN SELECT DISTINCT a FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 3 Using index
EXPLAIN SELECT DISTINCT a,b FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1_1 ALL NULL NULL NULL NULL 3 Using temporary
1 SIMPLE t1_2 index NULL PRIMARY 4 NULL 3 Using index; Distinct
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
WHERE t1_1.a = t1_2.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1_1 ALL PRIMARY NULL NULL NULL 3 Using temporary
1 SIMPLE t1_2 eq_ref PRIMARY PRIMARY 4 test.t1_1.a 1 Using index; Distinct
EXPLAIN SELECT a FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 3 Using index
EXPLAIN SELECT a,b FROM t1 GROUP BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
CREATE TABLE t2(a INT, b INT, c INT, d INT, PRIMARY KEY (a,b));
INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4);
EXPLAIN SELECT DISTINCT a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index
EXPLAIN SELECT DISTINCT a,a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index; Using temporary
EXPLAIN SELECT DISTINCT b,a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index
EXPLAIN SELECT DISTINCT a,c FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using temporary
EXPLAIN SELECT DISTINCT c,a,b FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3
EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort
CREATE UNIQUE INDEX c_b_unq ON t2 (c,b);
EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3
DROP TABLE t1,t2;
create table t1 (id int, dsc varchar(50));
insert into t1 values (1, "line number one"), (2, "line number two"), (3, "line number three");
select distinct id, IFNULL(dsc, '-') from t1;

28
mysql-test/t/distinct.test
View File

@ -348,6 +348,34 @@ SELECT DISTINCT a, b, 2 FROM t2;
SELECT DISTINCT 2, a, b FROM t2;
SELECT DISTINCT a, 2, b FROM t2;
DROP TABLE t1,t2;
#
# Bug#16458: Simple SELECT FOR UPDATE causes "Result Set not updatable"
# error.
#
CREATE TABLE t1(a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1), (2,1), (3,1);
EXPLAIN SELECT DISTINCT a FROM t1;
EXPLAIN SELECT DISTINCT a,b FROM t1;
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
WHERE t1_1.a = t1_2.a;
EXPLAIN SELECT a FROM t1 GROUP BY a;
EXPLAIN SELECT a,b FROM t1 GROUP BY a,b;
EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b;
CREATE TABLE t2(a INT, b INT, c INT, d INT, PRIMARY KEY (a,b));
INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4);
EXPLAIN SELECT DISTINCT a FROM t2;
EXPLAIN SELECT DISTINCT a,a FROM t2;
EXPLAIN SELECT DISTINCT b,a FROM t2;
EXPLAIN SELECT DISTINCT a,c FROM t2;
EXPLAIN SELECT DISTINCT c,a,b FROM t2;
EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d;
CREATE UNIQUE INDEX c_b_unq ON t2 (c,b);
EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d;
DROP TABLE t1,t2;
# Bug 9784 DISTINCT IFNULL truncates data