distinct.test

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

# Test of LEFT() with distinct
#

CREATE table t1 (  `id` int(11) NOT NULL auto_increment,  `name` varchar(50) NOT NULL default '',  PRIMARY KEY  (`id`)) ENGINE=MyISAM AUTO_INCREMENT=3 ;
INSERT INTO t1 VALUES (1, 'aaaaa');
INSERT INTO t1 VALUES (3, 'aaaaa');
INSERT INTO t1 VALUES (2, 'eeeeeee');
select distinct left(name,1) as name from t1;
drop  table t1; 

#
# Test case from sel000100
#

CREATE TABLE t1 (
  ID int(11) NOT NULL auto_increment,
  NAME varchar(75) DEFAULT '' NOT NULL,
  LINK_ID int(11) DEFAULT '0' NOT NULL,
  PRIMARY KEY (ID),
  KEY NAME (NAME),
  KEY LINK_ID (LINK_ID)
);

INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);

CREATE TABLE t2 (
  ID int(11) NOT NULL auto_increment,
  NAME varchar(150) DEFAULT '' NOT NULL,
  PRIMARY KEY (ID),
  KEY NAME (NAME)
);

SELECT DISTINCT
    t2.id AS key_link_id,
    t2.name AS link
FROM t1
LEFT JOIN t2 ON t1.link_id=t2.id
GROUP BY t1.id
ORDER BY link;
drop table t1,t2;

#
# test case for #674
#

CREATE TABLE t1 (
  html varchar(5) default NULL,
  rin int(11) default '0',
  rout int(11) default '0'
) ENGINE=MyISAM;

INSERT INTO t1 VALUES ('1',1,0);
SELECT DISTINCT html,SUM(rout)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
drop table t1;

#
# Test cases for #12625: DISTINCT for a list with constants
#

CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
SELECT DISTINCT a, 1 FROM t1;
SELECT DISTINCT 1, a FROM t1;

CREATE TABLE t2 (a int, b int); 
INSERT INTO t2 VALUES (1,1),(2,2),(2,3),(2,4),(3,5);
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 NOT NULL, c INT NOT NULL, 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
#
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;
drop table t1;

#
# Bug 21456: SELECT DISTINCT(x) produces incorrect results when using order by
#
CREATE TABLE t1 (a int primary key, b int);

INSERT INTO t1 (a,b) values (1,1), (2,3), (3,2);

explain SELECT DISTINCT a, b FROM t1 ORDER BY b;
SELECT DISTINCT a, b FROM t1 ORDER BY b;
DROP TABLE t1;

# End of 4.1 tests


#
# Bug #15745 ( COUNT(DISTINCT CONCAT(x,y)) returns wrong result)
#
CREATE TABLE t1 (
  ID int(11) NOT NULL auto_increment,
  x varchar(20) default NULL,
  y decimal(10,0) default NULL,
  PRIMARY KEY  (ID),
  KEY (y)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

INSERT INTO t1 VALUES
(1,'ba','-1'),
(2,'ba','1150'),
(306,'ba','-1'),
(307,'ba','1150'),
(611,'ba','-1'),
(612,'ba','1150');

select count(distinct x,y) from t1;
select count(distinct concat(x,y)) from t1;
drop table t1;

#
# Bug #18068: SELECT DISTINCT
#
CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b));

INSERT INTO t1 VALUES (1, 101);
INSERT INTO t1 SELECT a + 1, a + 101 FROM t1;
INSERT INTO t1 SELECT a + 2, a + 102 FROM t1;
INSERT INTO t1 SELECT a + 4, a + 104 FROM t1;
INSERT INTO t1 SELECT a + 8, a + 108 FROM t1;

EXPLAIN SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;

DROP TABLE t1;
# The test case for bug#20836 should be re-enabled when bug#16861 is resolved
# The results for the test should be the same as in 4.1.
#
#Bug #20836: Selecting into variables results in wrong results being returned
#
#--disable_warnings
#DROP TABLE IF EXISTS t1;
#--enable_warnings
#
#CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
#default NULL);
#
#INSERT INTO t1 VALUES (1,1,'ORANGE');
#INSERT INTO t1 VALUES (2,2,'APPLE');
#INSERT INTO t1 VALUES (3,2,'APPLE');
#INSERT INTO t1 VALUES (4,3,'PEAR');
#
#SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name = 
#'APPLE';
#SELECT @v1, @v2;
#
#SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id, 
#fruit_name HAVING fruit_name = 'APPLE';
#SELECT @v3, @v4;
#
#SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE 
#fruit_name = 'APPLE';
#SELECT @v5, @v6, @v7, @v8;
#
#SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1 
#WHERE fruit_name = 'APPLE';
#SELECT @v5, @v6, @v7, @v8, @v9, @v10;
#
#SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO 
#@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
#SELECT @v11, @v12, @v13, @v14;
#
#SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
#SELECT @v15, @v16;
#
#SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name = 
#'APPLE';
#SELECT @v17, @v18;
#
#--disable_warnings
#DROP TABLE IF EXISTS t2;
#--enable_warnings
#
#CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
#default NULL);
#
#SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE 
#'../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
#LOAD DATA INFILE '../tmp/data1.tmp' INTO TABLE t2;
#--exec rm $MYSQL_TEST_DIR/var/tmp/data1.tmp
#
#SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE 
#'../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
#LOAD DATA INFILE '../tmp/data2.tmp' INTO TABLE t2;
#--exec rm $MYSQL_TEST_DIR/var/tmp/data2.tmp
#
#SELECT @v19, @v20;
#SELECT * FROM t2;
#
#DROP TABLE t1;
#DROP TABLE t2;

#
# Bug #15881: cast problems
#
CREATE TABLE t1 (a CHAR(1)); INSERT INTO t1 VALUES('A'), (0);
SELECT a FROM t1 WHERE a=0;
SELECT DISTINCT a FROM t1 WHERE a=0;
DROP TABLE t1;
CREATE TABLE t1 (a DATE);
INSERT INTO t1 VALUES ('1972-07-29'), ('1972-02-06');
EXPLAIN SELECT (SELECT DISTINCT a FROM t1 WHERE a = '2002-08-03');
EXPLAIN SELECT (SELECT DISTINCT ADDDATE(a,1) FROM t1
                WHERE ADDDATE(a,1) = '2002-08-03');
CREATE TABLE t2 (a CHAR(5) CHARACTER SET latin1 COLLATE latin1_general_ci);
INSERT INTO t2 VALUES (0xf6);
INSERT INTO t2 VALUES ('oe');

SELECT COUNT(*) FROM (SELECT DISTINCT a FROM t2) dt;
SELECT COUNT(*) FROM 
  (SELECT DISTINCT a FROM t2 WHERE a='oe' COLLATE latin1_german2_ci) dt;

DROP TABLE t1, t2;

#
# Bug #25551: inconsistent behaviour in grouping NULL, depending on index type
#
CREATE TABLE t1 (a INT, UNIQUE (a));
INSERT INTO t1 VALUES (4),(null),(2),(1),(null),(3);
EXPLAIN SELECT DISTINCT a FROM t1;
#result must have one row with NULL
SELECT DISTINCT a FROM t1;
EXPLAIN SELECT a FROM t1 GROUP BY a;
#result must have one row with NULL
SELECT a FROM t1 GROUP BY a;

DROP TABLE t1;

#
#Bug #27659: SELECT DISTINCT returns incorrect result set when field is
#repeated
#
#
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES(1,1),(1,2),(1,3);
SELECT DISTINCT a, b FROM t1;
SELECT DISTINCT a, a, b FROM t1;
DROP TABLE t1;

--echo End of 5.0 tests