使MySQL查詢區(qū)分大小寫的實現(xiàn)方法

1、一種方法是可以設(shè)置表或行的collation，使其為binary或case

sensitive。在MySQL中，對于Column

Collate其約定的命名方法如下：

*_bin:

表示的是binary

case

sensitive

collation，也就是說是區(qū)分大小寫的

*_cs:

case

sensitive

collation，區(qū)分大小寫

*_ci:

case

insensitive

collation，不區(qū)分大小寫

###########

#

Start

binary

collation

example

###########

mysql

create

table

case_bin_test

(word

VARCHAR(10))

CHARACTER

SET

latin1

COLLATE

latin1_bin;

Query

OK,

rows

affected

(0.02

sec)

mysql

INSERT

INTO

case_bin_test

VALUES

('Frank'),('Google'),('froogle'),('flickr'),('FlicKr');

Query

OK,

5

rows

affected

(0.00

sec)

Records:

5

Duplicates:

Warnings:

mysql

SELECT

*

FROM

case_bin_test

WHERE

word

LIKE

'f%';

+---------+

|

word

|

+---------+

|

froogle

|

|

flickr

|

+---------+

2

rows

in

set

(0.00

sec)

mysql

SELECT

*

FROM

case_bin_test

WHERE

word

LIKE

'F%';

+---------+

|

word

|

+---------+

|

Frank

|

|

FlicKr

|

+---------+

4

rows

in

set

(0.00

sec)

###########

#

End

###########

2、另外一種方法

###########

#

Start

case

sensitive

collation

example

###########

mysql

create

table

case_cs_test

(word

VARCHAR(10))

CHARACTER

SET

latin1

COLLATE

latin1_general_cs;

Query

OK,

rows

affected

(0.08

sec)

mysql

INSERT

INTO

case_cs_test

VALUES

('Frank'),('Google'),('froogle'),('flickr'),('FlicKr');

Query

OK,

5

rows

affected

(0.00

sec)

Records:

5

Duplicates:

Warnings:

mysql

SELECT

*

FROM

case_cs_test

WHERE

word

LIKE

'F%';

+---------+

|

word

|

+---------+

|

Frank

|

|

FlicKr

|

+---------+

4

rows

in

set

(0.00

sec)

mysql

SELECT

*

FROM

case_cs_test

WHERE

word

LIKE

'f%';

+---------+

|

word

|

+---------+

|

froogle

|

|

flickr

|

+---------+

2

rows

in

set

(0.00

sec)

###########

#

end

###########

3、還有一種方法就是在查詢時指定collation

mysql

create

table

case_test

(word

VARCHAR(10))

CHARACTER

SET

latin1;

Query

OK,

rows

affected

(0.01

sec)

mysql

INSERT

INTO

case_test

VALUES

('Frank'),('Google'),('froogle'),('flickr'),('FlicKr');

Query

OK,

7

rows

affected

(0.01

sec)

Records:

7

Duplicates:

Warnings:

mysql

SELECT

*

FROM

case_test

WHERE

word

LIKE

'f%';

+---------+

|

word

|

+---------+

|

Frank

|

|

froogle

|

|

flickr

|

|

FlicKr

|

+---------+

6

rows

in

set

(0.01

sec)

mysql

SELECT

*

FROM

case_test

WHERE

word

LIKE

'F%';

+---------+

|

word

|

+---------+

|

Frank

|

|

froogle

|

|

flickr

|

|

FlicKr

|

+---------+

6

rows

in

set

(0.01

sec)

mysql

SELECT

*

FROM

case_test

WHERE

word

COLLATE

latin1_bin

LIKE

'F%';

+---------+

|

word

|

+---------+

|

Frank

|

|

FlicKr

|

+---------+

4

rows

in

set

(0.05

sec)

mysql

SELECT

*

FROM

case_test

WHERE

word

COLLATE

latin1_bin

LIKE

'f%';

+---------+

|

word

|

+---------+

|

froogle

|

|

flickr

|

+---------+

2

rows

in

set

(0.00

sec)

mysql

SELECT

*

FROM

case_test

WHERE

word

LIKE

'f%'

COLLATE

latin1_bin;

+---------+

|

word

|

+---------+

|

froogle

|

|

flickr

|

+---------+

2

rows

in

set

(0.00

sec)

mysql

SELECT

*

FROM

case_test

WHERE

word

LIKE

'F%'

COLLATE

latin1_bin;

+---------+

|

word

|

+---------+

|

Frank

|

|

FlicKr

|

+---------+

4

rows

in

set

(0.01

sec)

mysql

SELECT

*

FROM

case_test

WHERE

word

LIKE

'F%'

COLLATE

latin1_general_cs;

+---------+

|

word

|

+---------+

|

Frank

|

|

FlicKr

|

+---------+

4

rows

in

set

(0.04

sec)

mysql數(shù)據(jù)庫表名區(qū)分大小寫

使用mysql的時候，創(chuàng)建的表明都是大寫的，但是查詢語句中表明用消息就會報錯，表不存在。

查詢后發(fā)現(xiàn)mysql默認配置是表明區(qū)分大小寫的，如果要修改成不區(qū)分大小寫，需要修改一下配置。

mysql 怎么檢查大小寫敏感

1、linux下mysql安裝完后是默認：區(qū)分表名的大小寫，不區(qū)分列名的大小寫；

2、用root帳號登錄后，在/etc/my點吸煙f 中的[mysqld]后添加添加lower_case_table_names=1，重啟MYSQL服務(wù)，這時已設(shè)置成功：不區(qū)分表名的大小寫；

lower_case_table_names參數(shù)詳解：

lower_case_table_names = 0

其中 0：區(qū)分大小寫，1：不區(qū)分大小寫

MySQL在Linux下數(shù)據(jù)庫名、表名、列名、別名大小寫規(guī)則是這樣的：

1、數(shù)據(jù)庫名與表名是嚴格區(qū)分大小寫的；

2、表的別名是嚴格區(qū)分大小寫的；

3、列名與列的別名在所有的情況下均是忽略大小寫的；

4、變量名也是嚴格區(qū)分大小寫的；

MySQL在Windows下都不區(qū)分大小寫。

3、如果想在查詢時區(qū)分字段值的大小寫，則：字段值需要設(shè)置BINARY屬性，設(shè)置的方法有多種：

A、創(chuàng)建時設(shè)置：

CREATE TABLE T(

A VARCHAR(10) BINARY

);

B、使用alter修改：

ALTER TABLE `tablename` MODIFY COLUMN `cloname` VARCHAR(45) BINARY;

C、mysql table editor中直接勾選BINARY項。