mysql text字段判断是否为空 mysql text字段为空select * from `tableName` where `textField` is null or `textField` = ''; mysql text字段不为空select * from `tableName` where `textField` is not null AND `textField` != '';
如何获取MySql表中各个列的数据类型? show columns from tablename 返回结果如下: id int(11) NO PRI auto_increment uid varchar(255) NO UNI pwd varchar(255) NO grade int(11) NO 截图如下: 能获取详细的信息
定时获取MySQL库的大小 获取数据库单个库的大小命令 [root@admin ~]# cat db_size.txt mysql -h 192.8.1.1 -uUSER -pPASSWORD -e'use information_schema; select concat(round(((sum(DATA_LENGTH)+sum(INDEX_LENGTH))/1024/1024),2),"MB") as db_size from information_schema.tables w