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Editorial Team
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Asked: 2026-05-15T12:04:58+00:00

I am trying to do something like this: SELECT a.date AS EnrollDate, a.id, a.name,

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I am trying to do something like this: 

SELECT a.date AS EnrollDate, a.id, a.name, b.address FROM student a JOIN Location b ON a.id=b.id  
UNION  
SELECT a.date AS EnrollDate, a.id, a.name, b.address FROM teacher a JOIN Location b ON a.id=b.id  
WHERE a.date>'2010-01-01'  
ORDER BY EnrollDate

But the WHERE condition applies to the second SELECT statement only. I need to somehow apply to both the SELECT. The only option I have now is to apply WHERE condition individually. But I am working with several UNIONs and it is kind of tedious to include WHERE in all the places.
I was wondering if there is an easy way out.

By the way, I am working with MySQL.

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1 Answer

  1. Editorial Team
    SELECT * FROM (
    SELECT a.date AS EnrollDate, a.id, a.name, b.address FROM student a 
    JOIN Location b ON a.id=b.id  
    UNION  
    SELECT a.date AS EnrollDate, a.id, a.name, b.address FROM teacher a 
    JOIN Location b ON a.id=b.id  
) A
WHERE EnrollDate > '2010-01-01'  
ORDER BY EnrollDate

    This also has the advantage, compared to individual ORDER BY‘s that the whole result is correctly ordered.

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