ContextQMD
Back to Trino

DESCRIBE INPUT

docs/src/main/sphinx/sql/describe-input.md

480808 B
Original Source

DESCRIBE INPUT

Synopsis

text
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:

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

Prepare and describe a query with no parameters:

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

See also

{doc}prepare