1.8
AND, OR, NOT Logical Operators
AND, OR, NOT Logical Operators
- Logical operators are used in the WHERE clause
- You may use multiple logical operators in a WHERE clause to create a Compound condition. The order of evaluation when multiple operators are used is shown in the table above.
Table 6. Logical Operators
|
Operator |
Description |
Order of Evaluation |
|
NOT |
( a NOT b ) – a must be present but b must NOT be present to be included |
1 |
|
AND |
( a AND b ) –If both a and b are present, item is included |
2 |
|
OR |
( a OR b ) – If either a OR b is present item is included |
3 |
Example:
USE world;
SELECT name, population
FROM country
WHERE region = 'caribbean'
AND population > 100000
ORDER BY population ASC;
Results:
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