Use “result expression” from CASE expression in WHERE clause?

SQL-Server requires a table alias: SELECT * from ( SELECT first_name, last_name, CASE WHEN weight.

SELECT * from ( SELECT first_name, last_name, CASE WHEN weight.

Please add the required table alias. Tag says SQL-Server. – bernd_k Dec 30 '10 at 12:04.

I think you will have to use HAVING instead of WHERE: SELECT first_name, last_name, weight_class = CASE WHEN weight 214 AND weight.

Unlike MySQL You can't use column aliases in the having clause in SQL Server. +1 For the second query though which will potentially be more efficient as it allows an index range seek rather than an entire scan. – Martin Smith Dec 30 '10 at 12:07.

You can also use CROSS APPLY for this. Spiny Norman's second answer is the preferable way of doing this as it keeps the predicate sargable however. SELECT first_name, last_name, weight_class FROM athletes CROSS APPLY (SELECT CASE WHEN weight.

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