[填空题]数据库操作语句就是指insert、_________、_________和select语句。

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• ●    数据库操作语句就是指inert、_________、_________和elect语句。
• ●    SQL语言集数据查询、数据操作、数据定义和数据控制功能于一体，语句INSERT、DELETE、UPDATA实现下列哪类功________。