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In the next example we are going to check for updates on more than one column. To do so we are going to alter the trigger we created earlier. The next code will print a message if columns 2 and 4 are included in the updated columns and fail otherwise. This is because the bitwise operator when the left operand is of varbinary data type needs that the right operand to be of integer type. There is no need to use hexadecimal numbers in this case, but I decided to use them instead of decimal numbers because I think that it is easier and more intuitive when working with bitmasks.
On the next image there is a graphical representation of a byte with a mask on for columns 2 and 4. That mask represents the binary number which in decimal notation is 10, and in hexadecimal notation is A.
The next test script attempts to update our test table. To do so, we have to drop and re-create our sample table with 14 columns as follows. In the next image you will see the bitmask and its numeric value in both hexadecimal and decimal formats. Related Articles.
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