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I want to add a column in a query that does not exist in a table and return it as a result. So lets say TABLE_TEST has column A, B and I want to return values for A, B and C. I am trying to do
SELECT A, B, C=3 FROM TABLE_TEST
or
SELECT *, C=3 FROM TABLE_TEST
Can this be done in MySQL, Postgresel or MSSQL?
Yes, sure:
That’s it. It works on three db engines you’ve mentioned.