Unmatched Query

Unmatched Query

When one is working with large amounts of data, what is the quickest way of displaying rows not found when comparing two tables, without doing the following:

SELECT table1.field1 FROM Table1 WHERE Table1.field1 NOT IN (SELECT Table2.field1 FROM Table2)

When possible, you should always use the exists clause instead of the IN clause. Exists is more efficient.

 So select * from table1 wherenot exists(select * from table2 wheretable1.col1 = table2.col2)
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