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Editorial Team
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Asked: 2026-05-26T20:26:22+00:00

What approach should I follow to construct my SQL query if I need to

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What approach should I follow to construct my SQL query if I need to select a data exepct some other data?

For example, my

I want so select all the data from the data-base EXCEPT this result-set:

SELECT *
FROM table1
WHERE table1.MarketTYpe = 'EmergingMarkets'
AND IsBigOne = 1
AND MarketVolume = 'MIDDLE'
AND SomeClass = 'ThirdClass'

Should I use

  • NOT IN (the aboe result set)
  • Or shoudl I get INVERSE of the conditions like != inseat of = etc.
  • Or ?

Can you advice?

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1 Answer

  1. Editorial Team

    Use the EXCEPT construct?

    SELECT *
FROM table1
EXCEPT
SELECT *
FROM table1
WHERE table1.MarketTYpe = 'EmergingMarkets'
AND IsBigOne = 1
AND MarketVolume = 'MIDDLE'
AND SomeClass = 'ThirdClass'

    Note that EXCEPT and NOT EXISTS give the same query plan using “left anti semi joins”.

    NOT IN (subquery with above) may not give correct results if there are NULL values in the sub-query, hence I wouldn’t use

    I would avoid negation in the WHERE clause because it isn’t readable straight away
    As the comments show on Michael’s answer…

    For more on “all rows except some rows”, see these:

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