> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/15/reference/sql-commands/alter-operator.md).

# ALTER OPERATOR

## ALTER OPERATOR

ALTER OPERATOR — change the definition of an operator

### Synopsis

```

ALTER OPERATOR name ( { left_type | NONE } , right_type )
    OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }

ALTER OPERATOR name ( { left_type | NONE } , right_type )
    SET SCHEMA new_schema

ALTER OPERATOR name ( { left_type | NONE } , right_type )
    SET ( {  RESTRICT = { res_proc | NONE }
           | JOIN = { join_proc | NONE }
         } [, ... ] )
```

### Description

`ALTER OPERATOR` changes the definition of an operator.

You must own the operator to use `ALTER OPERATOR`. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have `CREATE` privilege on the operator's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the operator. However, a superuser can alter ownership of any operator anyway.)

### Parameters

*`name`*

The name (optionally schema-qualified) of an existing operator.

*`left_type`*

The data type of the operator's left operand; write `NONE` if the operator has no left operand.

*`right_type`*

The data type of the operator's right operand.

*`new_owner`*

The new owner of the operator.

*`new_schema`*

The new schema for the operator.

*`res_proc`*

The restriction selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.

*`join_proc`*

The join selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.

### Examples

Change the owner of a custom operator `a @@ b` for type `text`:

```

ALTER OPERATOR @@ (text, text) OWNER TO joe;
```

Change the restriction and join selectivity estimator functions of a custom operator `a && b` for type `int[]`:

```

ALTER OPERATOR && (_int4, _int4) SET (RESTRICT = _int_contsel, JOIN = _int_contjoinsel);
```

### Compatibility

There is no `ALTER OPERATOR` statement in the SQL standard.

### See Also

[CREATE OPERATOR](/15/reference/sql-commands/create-operator.md), [DROP OPERATOR](/15/reference/sql-commands/drop-operator.md)

***

原文：[PostgreSQL 15.19 Documentation](/15/reference/sql-commands/alter-operator.md)（英文原文，待翻譯）


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