mysql 实现首字母A-Z排序

两种方案：

1. 语句

select * from user ORDER BY CONVERT(name USING GBK) ASC;

// 这样可以实现中文排序，但是有个问题，英文字母没有排序，而且在中文上边

2. 自定义函数

“`mysql

DELIMITER $$    
 CREATE FUNCTION `fristPinyin`(P_NAME VARCHAR(255)) RETURNS varchar(255) CHARSET utf8      
 DETERMINISTIC    
 BEGIN     
  DECLARE V_RETURN VARCHAR(255);    
  DECLARE V_BOOL INT DEFAULT 0;    
  DECLARE FIRST_VARCHAR VARCHAR(1);    
  SET FIRST_VARCHAR = left(CONVERT(P_NAME USING gbk),1);       SELECT FIRST_VARCHAR REGEXP '[a-zA-Z]' INTO V_BOOL;   
     IF V_BOOL = 1 THEN   
       SET V_RETURN = FIRST_VARCHAR;   
     ELSE   
       SET V_RETURN = ELT(INTERVAL(CONV(HEX(left(CONVERT(P_NAME USING gbk),1)),16,10),0xB0A1,0xB0C5,0xB2C1,0xB4EE,0xB6EA,0xB7A2,0xB8C1,0xB9FE,0xBBF7, 0xBFA6,0xC0AC,0xC2E8,0xC4C3,0xC5B6,0xC5BE,0xC6DA,0xC8BB,0xC8F6,  0xCBFA,0xCDDA,0xCEF4,0xD1B9,0xD4D1), 'A','B','C','D','E','F','G','H','J','K','L','M','N','O','P','Q','R','S','T','W','X','Y','Z');     
END IF;   
RETURN V_RETURN;   
END$$   
DELIMITER; 


 
select * from app_user ORDER BY fristPinyin(name) ASC ;
// 即可实现英文也按中文排序