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My query is:
SELECT
offer,
(SELECT
AVG(offer)
FROM
project_bids
) as var1
FROM
`project_bids`
WHERE
offer > var1
It causes “#1054 – Unknown column ‘var1’ in ‘where clause'” error. Can anybody expalain why gives that error ? (i know working sql but i want to learn why it fails)
The sequence of execution of clauses of a SELECT statement is mentioned here:
http://blog.sqlauthority.com/2007/06/14/sql-server-easy-sequence-of-select-from-join-where-group-by-having-order-by/
Alias of an column can not be used in any clause except the last clause “ORDER BY”.