sql概述sql(structured query language)结构化查询语言,是关系数据库
并且要求提供secure english language test (selt),如果错过ddl,只能
2,2,ddl是数据库模式定义(data definition language)的简写,是描述
ddldatadefinitionlanguage数据类型
ddl(数据定义语言) data definition language
Tips:Do Not Provide
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