database rsa definition

ddl(data definition language)数据定义语言用来定义数据库对象:数据

简称ddl(data definition language),用来定义数据库对象:数据库,表

1. app definition and development1.

1数据库系统数据库系统包括数据库(db):database数据库管理系统(dbms)

table_options|add[column]col_namecolumn_definition[first

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