查看正在执行的sql语句
    show processlist;

停止正在执行的sql语句
    kill id（正在执行的sqlID）;

查询的时候增加一个字符串一起返回
    SELECT CONCAT("strvalue") AS str table;

表修复
    myisamchk -r table

获取表字段名称和注释
    SELECT COLUMN_NAME,COLUMN_COMMENT FROM INFORMATION_SCHEMA.Columns WHERE table_name='table_name';

查询表结构, 所有字段和属性
    SELECT * FROM INFORMATION_SCHEMA.Columns WHERE table_name='table_name' 

中文按照首字母排序
    SELECT * FROM table ORDER BY CONVERT(nickname USING gbk) asc;

整数值、表结构字符串类型 转为整数进行排序
    SELECT * FROM table ORDER BY CONVERT(code, SIGNED) asc;

中英文混合排序

写一个方法获取第一个字符，中文则转为字母，字母或数字则截取第一个字母返回

# 方法
CREATE FUNCTION `MY_FIRST_PINYIN`(P_NAME VARCHAR(255)) RETURNS varchar(255) CHARSET utf8
    COMMENT '中文首字母转拼音'
BEGIN
    DECLARE V_RETURN VARCHAR(255);
    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');

    IF ISNULL(V_RETURN) THEN
        SET V_RETURN = LEFT(P_NAME,1);
    END IF;
    RETURN UPPER(V_RETURN);
END;

# 查询语句
SELECT * FROM table ORDER BY MY_FIRST_PINYIN(nickname) asc;