Total security in a PostgreSQL database - StumbleUpon

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My OpenERP services setting

1. OpenERP Server 6.0 (Automatic)
2. OpenERP Web 6.0 (Automatic)
3. postgresql-9.0 - PostgreSQL Server 9.0 (Automatic)

My Oracle services setting

1. OracleDBConsoleMyERP (Automatic)
2. OracleJobSchedulerMYERP (Disabled)
3. OracleOraDb11g_home1TNSListener (Automatic)
4. OracleServiceMYERP (Automatic)

XOR operator

What will the output of the following scripts?
DECLARE @A INT, @B INT
SELECT @A = 12, @B = 15
SET @A = @A^@B
SET @B = @B^@A
SET @A = @A^@B
SELECT @A, @B

A. 12,15
B. Error occurs: no operator ^
C. Error occurs: incorrect syntax
D. 15,12
E. 13,14

Answer:[D]
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