通常如果表设计的时候增加了对应的首字母字段应该很好实现,那如果没加,应该怎么实现呢!
1.图示Sql
SELECT name,ELT(
INTERVAL (
CONV(
HEX(
LEFT (
CONVERT (NAME USING gbk),
1
)
),
16,
10
),
0xB0A1,
0xB0C5,
0xB2C1,
0xB4EE,
0xB6EA,
0xB7A2,
0xB8C1,
0xB9FE,
0xBBF7,
0xBFA6,
0xC0AC,
0xC2E8,
0xC4C3,
0xC5B6,
0xC5BE,
0xC6DA,
0xC8BB,
0xC8F6,
0xCBFA,
0xCDDA,
0xCEF4,
0xD1B9,
0xD4D1
),
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'J',
'K',
'L',
'M',
'N',
'O',
'P',
'Q',
'R',
'S',
'T',
'W',
'X',
'Y',
'Z'
) AS firstLetter from sys_user_lawyer_info;
将字段转换为Gbk编码,取左边第一位,然后和字符集相对应上
运行结果:
2.通过mysql function(函数) 进行实现
CREATE FUNCTION `fristPinyin` (P_NAME VARCHAR(255)) RETURNS VARCHAR (255) CHARSET utf8 DETERMINISTIC
BEGIN
DECLARE V_RETURN VARCHAR (255);
DECLARE V_BOOL INT DEFAULT 0;
DECLARE V_NUM VARCHAR (2);
DECLARE FIRST_VARCHAR VARCHAR (1);
SET FIRST_VARCHAR = LEFT (CONVERT(P_NAME USING gbk), 1);
SELECT
FIRST_VARCHAR REGEXP '[a-zA-Z]' INTO V_BOOL;
SELECT
FIRST_VARCHAR REGEXP '[0-9]' INTO V_NUM;
IF V_BOOL = 1 THEN
SET V_RETURN = FIRST_VARCHAR;
ELSEIF V_NUM = 1 THEN
SET V_RETURN = '#';
ELSE
SET V_RETURN = ELT(
INTERVAL (
CONV(
HEX(
LEFT (CONVERT(P_NAME USING gbk), 1)
),
16,
10
),
0xB0A1,
0xB0C5,
0xB2C1,
0xB4EE,
0xB6EA,
0xB7A2,
0xB8C1,
0xB9FE,
0xBBF7,
0xBFA6,
0xC0AC,
0xC2E8,
0xC4C3,
0xC5B6,
0xC5BE,
0xC6DA,
0xC8BB,
0xC8F6,
0xCBFA,
0xCDDA,
0xCEF4,
0xD1B9,
0xD4D1
),
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'J',
'K',
'L',
'M',
'N',
'O',
'P',
'Q',
'R',
'S',
'T',
'W',
'X',
'Y',
'Z'
);
END
IF;
RETURN V_RETURN;
END;
select fristPinyin(column) firstName from table;
成功如图所示