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# DROP AGGREGATE

### DROP AGGREGATE

DROP AGGREGATE — remove an aggregate function

### Synopsis

```

DROP AGGREGATE [ IF EXISTS ] name ( aggregate_signature ) [, ...] [ CASCADE | RESTRICT ]

where aggregate_signature is:

* |
[ argmode ] [ argname ] argtype [ , ... ] |
[ [ argmode ] [ argname ] argtype [ , ... ] ] ORDER BY [ argmode ] [ argname ] argtype [ , ... ]
```

### Description

`DROP AGGREGATE` removes an existing aggregate function. To execute this command the current user must be the owner of the aggregate function.

### Parameters

`IF EXISTS` : Do not throw an error if the aggregate does not exist. A notice is issued in this case.

*`name`* : The name (optionally schema-qualified) of an existing aggregate function.

*`argmode`* : The mode of an argument: `IN` or `VARIADIC`. If omitted, the default is `IN`.

*`argname`* : The name of an argument. Note that `DROP AGGREGATE` does not actually pay any attention to argument names, since only the argument data types are needed to determine the aggregate function's identity.

*`argtype`* : An input data type on which the aggregate function operates. To reference a zero-argument aggregate function, write `*` in place of the list of argument specifications. To reference an ordered-set aggregate function, write `ORDER BY` between the direct and aggregated argument specifications.

`CASCADE` : Automatically drop objects that depend on the aggregate function (such as views using it), and in turn all objects that depend on those objects (see [Section 5.15](/the-sql-language/ddl/ddl-depend.md)).

`RESTRICT` : Refuse to drop the aggregate function if any objects depend on it. This is the default.

### Notes

Alternative syntaxes for referencing ordered-set aggregates are described under [ALTER AGGREGATE](/reference/sql-commands/sql-alteraggregate.md).

### Examples

To remove the aggregate function `myavg` for type `integer`:

```

DROP AGGREGATE myavg(integer);
```

To remove the hypothetical-set aggregate function `myrank`, which takes an arbitrary list of ordering columns and a matching list of direct arguments:

```

DROP AGGREGATE myrank(VARIADIC "any" ORDER BY VARIADIC "any");
```

To remove multiple aggregate functions in one command:

```

DROP AGGREGATE myavg(integer), myavg(bigint);
```

### Compatibility

There is no `DROP AGGREGATE` statement in the SQL standard.

### See Also

[ALTER AGGREGATE](/reference/sql-commands/sql-alteraggregate.md), [CREATE AGGREGATE](/reference/sql-commands/sql-createaggregate.md)

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/sql-dropaggregate.html)（英文原文，待翻譯）


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