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Databases,Tables, Views, Indexing and SQL syntax
Select ;
Union Select Where NOT Exists Select
How does the SQL engine perform this task? Is the selection gathered twice, or does the result set get reused?
The reason i ask is because it would make more sense to issue several Selects and reuse the intermediate results than to phrase one SQL statement that causes several redundant selects. I'm sure one statement would be better on a back-end DB server (SQL/Oracle) but on a native VFP table, which method is optimal?
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