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The BITOR function is used to perform the bitwise OR comparison of two integers specified by numeric expressions. It takes the general form :

BITOR(expression1, expression2)

If either expression1 or expression2 evaluates to the null value, null is returned. 

The bitwise OR operation compares two integers bit by bit. It returns the bit 1 if the bit in either or both numbers is 1; else, it returns the bit 0.
Non integer values are truncated before the operation is performed.
The BITOR operation is performed on a 32-bit twos-complement word. It should be noted that differences in hardware architecture can make the use of the high-order bit non portable.

An example of use is as : 

* Binary value of 6 = 0110
* Binary value of 12 = 1100

This results in 1110, and the following output is displayed: 14

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