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Why does not combine DML and DDL to DXL?

688720Jul 27 2011 — edited Jul 27 2011

I wonder why SQL language devide into these four parts, DQL, DML, DCL and DDL.
Why does not combine DML and DDL to DXL.
What's the benefit of the division?
Thanks.

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Locked on Aug 24 2011

Added on Jul 27 2011

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