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explain select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> system NULL NULL NULL NULL 1
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2 DERIVED t2 system NULL NULL NULL NULL 1
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2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where
121
2 DERIVED t2 ALL NULL NULL NULL NULL 1
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2 DERIVED t1 ALL NULL NULL NULL NULL 4 Using where; Using join buffer
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drop table t1, t2;
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create table t1(a int not null, t char(8), index(a));
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SELECT * FROM (SELECT * FROM t1) as b ORDER BY a ASC LIMIT 0,20;
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
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2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort
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create table t1 (mat_id MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, matintnum CHAR(6) NOT NULL, test MEDIUMINT UNSIGNED NULL);
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create table t2 (mat_id MEDIUMINT UNSIGNED NOT NULL, pla_id MEDIUMINT UNSIGNED NOT NULL);
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create table t1 (mat_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, matintnum CHAR(6) NOT NULL, test INT NULL);
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create table t2 (mat_id INT NOT NULL, pla_id INT NOT NULL);
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insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd', 4), (NULL, 'e', 5), (NULL, 'f', 6), (NULL, 'g', 7), (NULL, 'h', 8), (NULL, 'i', 9);
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insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105);
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SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
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1 PRIMARY m2 ALL NULL NULL NULL NULL 9
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 Using where; Using join buffer
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2 DERIVED mp ALL NULL NULL NULL NULL 9 Using temporary; Using filesort
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2 DERIVED m1 eq_ref PRIMARY PRIMARY 3 test.mp.mat_id 1
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2 DERIVED m1 eq_ref PRIMARY PRIMARY 4 test.mp.mat_id 1
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explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY m2 ALL NULL NULL NULL NULL 9
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 6 Using where; Using join buffer
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2 DERIVED mp ALL NULL NULL NULL NULL 9 Using temporary; Using filesort
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2 DERIVED m1 eq_ref PRIMARY PRIMARY 3 test.mp.mat_id 1
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2 DERIVED m1 eq_ref PRIMARY PRIMARY 4 test.mp.mat_id 1
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drop table t1,t2;
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SELECT a.x FROM (SELECT 1 AS x) AS a HAVING a.x = 1;
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create user mysqltest_1;
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create table t1 select 1 as a;
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select 2 as a from (select * from t1) b;
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ERROR 3D000: No database selected
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select 2 as a from (select * from t1) b;
214
select mail_id, if(folder.f_description!='', folder.f_description, folder.f_name) as folder_name, date, address_id, phrase, address, subject from folder, (select mail.mail_id as mail_id, date_format(mail.h_date, '%b %e, %Y %h:%i') as date, mail.folder_id, sender.address_id as address_id, sender.phrase as phrase, sender.address as address, mail.h_subject as subject from mail left join mxa as mxa_sender on mail.mail_id=mxa_sender.mail_id and mxa_sender.type='from' left join address as sender on mxa_sender.address_id=sender.address_id mxa as mxa_recipient, address as recipient, where 1 and mail.mail_id=mxa_recipient.mail_id and mxa_recipient.address_id=recipient.address_id and mxa_recipient.type='to' and match(sender.phrase, sender.address, sender.comment) against ('jeremy' in boolean mode) and match(recipient.phrase, recipient.address, recipient.comment) against ('monty' in boolean mode) order by mail.h_date desc limit 0, 25 ) as query where query.folder_id=folder.folder_id;
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mxa as mxa_recipient, address as recipient, where 1 and mail.mail_id=mxa_r' at line 1
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create table t1 (a int);
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insert into t1 values (1),(2),(3);
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update (select * from t1) as t1 set a = 5;
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ERROR HY000: The target table t1 of the UPDATE is not updatable
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delete from (select * from t1);
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(select * from t1)' at line 1
215
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near '(select * from t1)' at line 1
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insert into (select * from t1) values (5);
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(select * from t1) values (5)' at line 1
217
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near '(select * from t1) values (5)' at line 1
225
create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
219
create table t1 (E1 INTEGER NOT NULL, E2 INTEGER NOT NULL, E3 INTEGER NOT NULL, PRIMARY KEY(E1)
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insert into t1 VALUES(1,1,1), (2,2,1);
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select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
257
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CREATE TABLE `t1` (
258
`N` int(11) unsigned NOT NULL default '0',
259
`M` tinyint(1) default '0'
260
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
252
`N` int NOT NULL default '0',
261
255
INSERT INTO `t1` (N, M) VALUES (1, 0),(1, 0),(1, 0),(2, 0),(2, 0),(3, 0);
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UPDATE `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2;
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select * from t1;
271
UPDATE `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2, P2.N = 2;
272
ERROR HY000: The target table P2 of the UPDATE is not updatable
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265
UPDATE `t1` AS P1 INNER JOIN (SELECT aaaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N SET P1.M = 2;
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266
ERROR 42S22: Unknown column 'aaaa' in 'field list'
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delete P1.* from `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N;
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268
select * from t1;
279
delete P1.*,p2.* from `t1` AS P1 INNER JOIN (SELECT N FROM `t1` GROUP BY N HAVING Count(M) > 1) AS p2 ON P1.N = p2.N;
280
ERROR HY000: The target table p2 of the DELETE is not updatable
281
delete P1.* from `t1` AS P1 INNER JOIN (SELECT aaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS P2 ON P1.N = P2.N;
271
delete P1.* from `t1` AS P1 INNER JOIN (SELECT aaa FROM `t1` GROUP BY N HAVING Count(M) > 1) AS p2 ON P1.N = p2.N;
282
272
ERROR 42S22: Unknown column 'aaa' in 'field list'
284
274
CREATE TABLE t1 (
285
OBJECTID int(11) NOT NULL default '0',
286
SORTORDER int(11) NOT NULL auto_increment,
275
OBJECTID int NOT NULL default 0,
276
SORTORDER int NOT NULL auto_increment,
287
277
KEY t1_SortIndex (SORTORDER),
288
278
KEY t1_IdIndex (OBJECTID)
289
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
290
280
CREATE TABLE t2 (
291
ID int(11) default NULL,
292
PARID int(11) default NULL,
282
PARID int default NULL,
293
283
UNIQUE KEY t2_ID_IDX (ID),
294
284
KEY t2_PARID_IDX (PARID)
295
) engine=MyISAM DEFAULT CHARSET=latin1;
296
286
INSERT INTO t2 VALUES (1000,0),(1001,0),(1002,0),(1003,0),(1008,1),(1009,1),(1010,1),(1011,1),(1016,2);
297
287
CREATE TABLE t3 (
298
ID int(11) default NULL,
299
289
DATA decimal(10,2) default NULL,
300
290
UNIQUE KEY t3_ID_IDX (ID)
301
) engine=MyISAM DEFAULT CHARSET=latin1;
302
292
INSERT INTO t3 VALUES (1000,0.00),(1001,0.25),(1002,0.50),(1003,0.75),(1008,1.00),(1009,1.25),(1010,1.50),(1011,1.75);
303
293
select 497, TMP.ID, NULL from (select 497 as ID, MAX(t3.DATA) as DATA from t1 join t2 on (t1.ObjectID = t2.ID) join t3 on (t1.ObjectID = t3.ID) group by t2.ParID order by DATA DESC) as TMP;
305
295
drop table t1, t2, t3;
306
CREATE TABLE t1 (name char(1) default NULL, val int(5) default NULL);
296
CREATE TABLE t1 (name char(1) default NULL, val int default NULL);
307
297
INSERT INTO t1 VALUES ('a',1), ('a',2), ('a',2), ('a',2), ('a',3), ('a',6), ('a',7), ('a',11), ('a',11), ('a',12), ('a',13), ('a',13), ('a',20), ('b',2), ('b',3), ('b',4), ('b',5);
308
298
SELECT s.name, AVG(s.val) AS median FROM (SELECT x.name, x.val FROM t1 x, t1 y WHERE x.name=y.name GROUP BY x.name, x.val HAVING SUM(y.val <= x.val) >= COUNT(*)/2 AND SUM(y.val >= x.val) >= COUNT(*)/2) AS s GROUP BY s.name;
319
309
insert into t2 values (1,7),(2,7);
320
310
explain select a from t2 where a>1;
321
311
id select_type table type possible_keys key key_len ref rows Extra
322
1 SIMPLE t2 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index
312
1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 1 Using where; Using index
323
313
explain select a from (select a from t2 where a>1) tt;
324
314
id select_type table type possible_keys key key_len ref rows Extra
325
315
1 PRIMARY <derived2> system NULL NULL NULL NULL 1
326
2 DERIVED t2 index PRIMARY PRIMARY 4 NULL 2 Using where; Using index
316
2 DERIVED t2 range PRIMARY PRIMARY 4 NULL 1 Using where; Using index
328
CREATE TABLE `t1` ( `itemid` int(11) NOT NULL default '0', `grpid` varchar(15) NOT NULL default '', `vendor` int(11) NOT NULL default '0', `date_` date NOT NULL default '0000-00-00', `price` decimal(12,2) NOT NULL default '0.00', PRIMARY KEY (`itemid`,`grpid`,`vendor`,`date_`), KEY `itemid` (`itemid`,`vendor`), KEY `itemid_2` (`itemid`,`date_`));
318
CREATE TABLE `t1` ( `itemid` int NOT NULL default 0, `grpid` varchar(15) NOT NULL default '', `vendor` int NOT NULL default 0, `date_` date NOT NULL default '1900-01-01', `price` decimal(12,2) NOT NULL default '0.00', PRIMARY KEY (`itemid`,`grpid`,`vendor`,`date_`), KEY `itemid` (`itemid`,`vendor`), KEY `itemid_2` (`itemid`,`date_`));
329
319
insert into t1 values (128, 'rozn', 2, curdate(), 10),
330
320
(128, 'rozn', 1, curdate(), 10);
331
321
SELECT MIN(price) min, MAX(price) max, AVG(price) avg FROM (SELECT SUBSTRING( MAX(concat(date_,";",price)), 12) price FROM t1 WHERE itemid=128 AND grpid='rozn' GROUP BY itemid, grpid, vendor) lastprices;
368
358
create table t1 (a int);
369
359
create table t2 (a int);
370
360
select * from (select * from t1,t2) foo;
371
ERROR 42S21: Duplicate column name 'a'
372
362
drop table t1,t2;
373
create table t1 (ID int unsigned not null auto_increment,
363
create table t1 (ID int not null auto_increment,
374
364
DATA varchar(5) not null, primary key (ID));
375
create table t2 (ID int unsigned not null auto_increment,
376
DATA varchar(5) not null, FID int unsigned not null,
365
create table t2 (ID int not null auto_increment,
366
DATA varchar(5) not null, FID int not null,
377
367
primary key (ID));
378
368
select A.* from (t1 inner join (select * from t2) as A on t1.ID = A.FID);