Archives of the TeradataForum
Message Posted: Wed, 13 Oct 2004 @ 11:47:00 GMT
| Subj: | | Re: Can this query be written more efficient |
| |
| From: | | David Clough |
Narayan writes:
| | You are trying to achieve something like {(A-B) U B }, which is similar to just {A U B}. | |
| | So I guess you could use: | |
Insert into table_copy
Sel * from table
Union
Sel * from mtable;
This method assumes that ALL columns on mtable = ALL columns on table, whereas it might be - John can confirm one way of the other - that
only X & Y are the same (and therefore that row is not needed)
Otherwise, yes, much neater.
Dave Clough
Database Designer
Database Design Group
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