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37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
# Show All Versions Of An Operator
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We may be familiar with PostgreSQL's containment operator (`@>`). Maybe
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we've used it with an array before, so we understand the general idea. But
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now we are curious about what are the other types with which this
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containment operator can be used.
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We can quickly find out the answer with the `\do` command in `psql`:
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```sql
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> \do @>
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List of operators
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Schema | Name | Left arg type | Right arg type | Result type | Description
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------------+------+---------------+----------------+-------------+-------------
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pg_catalog | @> | aclitem[] | aclitem | boolean | contains
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pg_catalog | @> | anyarray | anyarray | boolean | contains
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pg_catalog | @> | anyrange | anyelement | boolean | contains
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pg_catalog | @> | anyrange | anyrange | boolean | contains
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pg_catalog | @> | box | box | boolean | contains
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pg_catalog | @> | box | point | boolean | contains
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pg_catalog | @> | circle | circle | boolean | contains
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pg_catalog | @> | circle | point | boolean | contains
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pg_catalog | @> | jsonb | jsonb | boolean | contains
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pg_catalog | @> | path | point | boolean | contains
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pg_catalog | @> | polygon | point | boolean | contains
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pg_catalog | @> | polygon | polygon | boolean | contains
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pg_catalog | @> | tsquery | tsquery | boolean | contains
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```
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The `Left arg type` and `Right arg type` columns tell us what we need to
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know.
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This `\do` command can be used with any operator for a similar set of
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information.
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h/t Bruce Momjian
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