May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Mathematical operators
Mathematical operators perform math in your query. The mathematical operators are shown in the following table:
| Symbol | Description | Examples |
| + | addition | column + 1 |
| - | subtraction | column - 1 |
| * | multiplication | column * 1 |
| / | division | column / 1 |
Some example use cases of mathematical operators are listed here:
- SELECT column1 + 2: This returns a column1 value with 2 added to it, so if the value of column1 is 1, then it will display in the results as 3.
- WHERE column1 + 2: This returns all rows where column1 values equal column1 plus 2.
- SELECT 1 + NULL + 3: This returns NULL, as any of the mathematical operators will return when used with a NULL value, so if a column contains a NULL value and you use it with ...
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