SQL建表时添加credits一列,要求取值介于0-8之间的表达式?credits smallint(3) check(

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SQL建表时添加credits一列,要求取值介于0-8之间的表达式?credits smallint(3) check(?)
SQL建表时添加credits一栏,要求取值介于0-8之间的表达式?
credits smallint(3) check(?) 问号中加东西吗?加什么?

加,check(credits>=0 and credits

SQL建表时添加credits一列,要求取值介于0-8之间的表达式?credits smallint(3) check( credits的意思 Credits 和Credits Credits是什么意思 opening credits 和 ending credits losses and credits 什么是income tax credits tax franking credits credits中文翻译是什么意思? diversion credits什么意思 Film Credits是什么意思呀 job posting credits