The operators listed here are defined for a number of native data types, ranging from numeric types to data/time types.
Table 4-2. Postgres Operators
| Operator | Description | Usage |
|---|---|---|
| < | Less than? | 1 < 2 |
| <= | Less than or equal to? | 1 <= 2 |
| <> | Not equal? | 1 <> 2 |
| = | Equal? | 1 = 1 |
| > | Greater than? | 2 > 1 |
| >= | Greater than or equal to? | 2 >= 1 |
| || | Concatenate strings | 'Postgre' || 'SQL' |
| !!= | NOT IN | 3 !!= i |
| ~~ | LIKE | 'scrappy,marc,hermit' ~~ '%scrappy%' |
| !~~ | NOT LIKE | 'bruce' !~~ '%al%' |
| ~ | Match (regex), case sensitive | 'thomas' ~ '.*thomas.*' |
| ~* | Match (regex), case insensitive | 'thomas' ~* '.*Thomas.*' |
| !~ | Does not match (regex), case sensitive | 'thomas' !~ '.*Thomas.*' |
| !~* | Does not match (regex), case insensitive | 'thomas' !~* '.*vadim.*' |