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I'd like to alter a PostgreSQL column to convert from integer to decimal, setting all integer values to <value>.0. How do I do this?

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    DECIMAL is really NUMERIC in Pg, for what it's worth. If you need to do any explicit transformations, see the USING clause. Commented Jun 5, 2013 at 23:53

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ALTER TABLE my_table_name ALTER some_column TYPE decimal;

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