Mysql怎样在SQL中实现区分大小写的查询

1.问题描述

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mysql版本：mariadb 10.1.16,采用utf8-ci，不区分大小写的排序规则。

开发人员反应业务要求要区分大小写，就是说当输入小写条件时，只能返回小写条件对应的数据，不能返回大写。

dba@192.168.19.215:3306mdls01:58:57SELECT

- cabinet_no

- FROM

- go_task_ycon_refrence gtyr

- WHERE

- 1 = 1

- AND cabinet_no = 'abcd4499503'

- ORDER BY

- 1 ASC;

+-------------+

| cabinet_no |

+-------------+

| ABCD4499503 |

+-------------+

1 row in set (0.00 sec)

2.问题解决

在条件字段后面加COLLATE utf8_bin ，或在表级或字段级指定COLLATE utf8_bin

dba@192.168.19.215:3306mdls02:08:08SELECT

- cabinet_no

- FROM

- gtyr

- WHERE

- 1 = 1

- AND cabinet_no COLLATE utf8_bin = 'ABCDU4499503'

- ORDER BY

- 1 ASC;

+-------------+

| cabinet_no |

+-------------+

| ABCD4499503 |

+-------------+

1 row in set (0.00 sec)

dba@192.168.19.215:3306mdls02:08:43SELECT

- cabinet_no

- FROM

- gtyr

- WHERE

- 1 = 1

- AND cabinet_no COLLATE utf8_bin = 'abcd4499503'

- ORDER BY

- 1 ASC;

Empty set (0.00 sec)

使MySQL查询区分大小写的实现方法

1、一种方法是可以设置表或行的collation，使其为binary或case

sensitive。在MySQL中，对于Column

Collate其约定的命名方法如下：

*_bin:

表示的是binary

case

sensitive

collation，也就是说是区分大小写的

*_cs:

case

sensitive

collation，区分大小写

*_ci:

case

insensitive

collation，不区分大小写

###########

#

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、另外一种方法

###########

#

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、还有一种方法就是在查询时指定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，oracle，sql中对于大小写字符串的查询怎么设置？

字符串都是区分大小写的，都是用upper(字符串)转大写

lower(字符串)转小写