Reusing A Query Output In The Same Query
I am guessing a basic question but not one I can find an obvious answer to.
If I create a calculated or modified column in a query (such as a modified text string), and then want to reuse that in the same query as I need to do three or four operations on it in sequence, how do I do it in mySQL 4.1?
Do I need to create a new column to store the interim result in an existing table (and then clear or alter it each time I run the query), or create a temporary table, or is there an easy way to reuse the query output in the same query (does the query have a name like a table name)?
If it requires a new column or table, are there particular disciplines to ensure it is robust and self maintaining?
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