Updating a flags field by SQL in Oracle DB

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We are trying to make our product compatible with Oracle. Upto now, we support MS Access and SQL Server. We are searching for the Oracle equivalent of:

SQL Server:
UPDATE MyTable SET MyColumn = MyColumn & ~ 256

Access:
UPDATE MyTable SET MyColumn = MyColumn BAND BNOT 256

Thanks a lot for your hints.

Posted 15-Apr-10 4:42am

Bernhard Hiller

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Bernhard Hiller · Answer 1 · 2010-04-15T20:24:00

Eventually I discovered a useful search term for Google (+oracle +number +xor) and then found out that Oracle has only one logical operator for numbers: BITAND. With BITAND and some math, other operators can be calculated (see also http://database.itags.org/oracle/22028/[^])
Hence, the solution is:

Oracle:
UPDATE MyTable SET MyColumn = BITAND(MyColumn, (-1 -256))