mysql一些常用sql语句
-- 修改表注释ALTER table table_name comment "需要修改注释的信息";
-- 修改root 密码
ALTER USER "root"@"localhost" IDENTIFIED BY "123456";
--授权远程访问
grant all privileges on *.* to "root"@"%" identified by "123456";
-- 更新表数据
UPDATE table_name set 字段1 = 字段值1字段2 = 字段值2 where 查询条件1=条件值1 and ...;
-- 查询计划
EXPLAIN
select * from table_name t
-- 带序号的查询
SELECT (@rownum := @rownum +1) AS rownum , lo.order_id FROM orders lo,(SELECT @rownum := 0) WHERE lo.order_status in ("3","4","5")
--查询ASCII码
select ascii("a");
--查询数据库版本
SHOW VARIABLES WHERE Variable_name = "version";
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