Presto 0.199 Documentation

8.12. DESCRIBE INPUT

8.12. DESCRIBE INPUT

Synopsis

DESCRIBE INPUT statement_name

Description

Lists the input parameters of a prepared statement along with the position and type of each parameter. Parameter types that cannot be determined will appear as unknown.

Examples

Prepare and describe a query with three parameters:

PREPARE my_select1 FROM
SELECT ? FROM nation WHERE regionkey = ? AND name < ?;
DESCRIBE INPUT my_select1;
 Position | Type
--------------------
        0 | unknown
        1 | bigint
        2 | varchar
(3 rows)

Prepare and describe a query with no parameters:

PREPARE my_select2 FROM
SELECT * FROM nation;
DESCRIBE INPUT my_select2;
 Position | Type
-----------------
(0 rows)

See Also

PREPARE