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Given the query…
UPDATE
Table1
SET
col1 = col1 + 1,
col2 = col1 * 2
WHERE
colID = 1
…if col1 equals 1 before the query is executed, will col2 be set to 2 or 4 after the query is executed?
Just give it a try. But here you go:
http://sqlfiddle.com/#!2/7b6de/1
Col2 updates to 4.
Good luck.