Comparison operators

A comparison operator tests the relationship between two values and returns a corresponding value of true, false, or NULL.

Table of contents

• Basic operators

• WHERE clause operators

Basic operators

For simple data types, the following basic operators can be used:

When comparing strings, a lexicographical comparison is performed:

cr> select name from locations where name > 'Argabuthon' order by name;
+------------------------------------+
| name                               |
+------------------------------------+
| Arkintoofle Minor                  |
| Bartledan                          |
| Galactic Sector QQ7 Active J Gamma |
| North West Ripple                  |
| Outer Eastern Rim                  |
+------------------------------------+
SELECT 5 rows in set (... sec)

When comparing dates, ISO date formats can be used:

cr> select date, position from locations where date <= '1979-10-12' and
... position < 3 order by position;
+--------------+----------+
| date         | position |
+--------------+----------+
| 308534400000 |        1 |
| 308534400000 |        2 |
+--------------+----------+
SELECT 2 rows in set (... sec)

Tip

Comparison operators are commonly used to filter rows (e.g., in the WHERE and HAVING clauses of a SELECT statement). However, basic comparison operators can be used as value expressions in any context. For example:

cr> SELECT 1 < 10 as my_column;
+--------------+
| my_column    |
+--------------+
| true         |
+--------------+
SELECT 1 rows in set (... sec)

WHERE clause operators

Within a WHERE clause, the following operators can also be used:

See also

• Array comparisons

• Subquery expressions