describe table_name;這個命令用來顯示一個表格的結構+----------+-----------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+----------+-----------+------+-----+---------+-------+| ID | int(11) | NO | PRI | NULL | || userName | char(20) | NO | | NULL | || password | char(20) | NO | | NULL | || niName | char(20) | NO | | NULL | || sex | char(10) | NO | | NULL | || phone | char(20) | YES | | NULL | || address | char(100) | YES | | NULL | |+----------+-----------+------+-----+---------+-------+和這個命令可以實現同樣效果的是:show columns from table_name;show create table table_name;//顯示某個表格被建立時所用的SQL語句create table user | CREATE TABLE `user` ( `ID` int(11) NOT NULL, `userName` char(20) NOT NULL, `password` char(20) NOT NULL, `niName` char(20) NOT NULL, `sex` char(10) NOT NULL, `phone` char(20) DEFAULT NULL, `address` char(100) DEFAULT NULL, PRIMARY KEY (`ID`)) ENGINE=InnoDB DEFAULT CHARSET=latin1