DROP CAST ​

Function ​

DROP CAST deletes a type conversion.

Precautions ​

DROP CAST deletes a previously defined type conversion.

To delete a type conversion, you must have a source or destination data type. This is the same permission as creating a type conversion.

Syntax ​

DROP CAST [ IF EXISTS ] (source_type AS target_type) [ CASCADE | RESTRICT ]

Parameter Description ​

• IF EXISTS

  Do not throw an error if the specified conversion does not exist. A notice is issued in this case.

• source_type

  Source data type in the type conversion.

• target_type

  Type of the target data in the type conversion.

• CASCADE

  RESTRICT

  These keys have no effect because there is no dependency on type conversion.

Example ​

Delete the conversion from text to int.

DROP CAST (text AS int);

Compatibility ​

DROP CAST complies with the SQL standard.