In a SQL GROUP BY query, what value is used for the non-aggregate columns?
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Published on 2011-02-28T15:20:47Z
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Say I've got the following data back from a SQL query:
Lastname Firstname Age
Anderson Jane 28
Anderson Lisa 22
Anderson Jack 37
If I want to know the age of the oldest person with the last name Anderson, I can select MAX(Age) and GROUP BY Lastname. But I also want to know the first name of that oldest person. How can I make sure that, when the Firstname values are collapsed into one row by the GROUP BY, I get the Firstname value from the same row where I got the max age?
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