Using column alias in WHERE clause of MySQL query produces an error

Question

The query I\'m running is as follows, however I\'m getting this error:

#1054 - Unknown column \'guaranteed_postcode\' in \'IN/ALL/ANY subquery\'

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Answer 1

Maybe my answer is too late but this can help others.

You can enclose it with another select statement and use where clause to it.

SELECT * FROM (Select col1, col2,...) as t WHERE t.calcAlias > 0

calcAlias is the alias column that was calculated.