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MySQL 规定:varchar必须指定长度,否则报错:ERROR 1064 (42000)
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只有一列时,primary key 直接写在这一列的后面;
没有定义主键时,提示错误:ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key
MySQL 规定:varchar必须指定长度,否则报错:ERROR 1064 (42000)
只有一列时,primary key 直接写在这一列的后面;
没有定义主键时,提示错误:ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key