17.25. PREPARE

Synopsis

PREPARE statement_name FROM statement

Description

Prepares a statement for execution later. Prepared statements are queries that are saved on a per-session basis with a given name. The statement can include parameters in place of literals to be filled in at execution time. Parameters are represented by question marks.

Examples

Prepare a select query:

PREPARE my_select1 FROM
SELECT * FROM nation;

Prepare a select query that includes parameters. The values to compare with regionkey and nationkey will be filled in with the EXECUTE statement:

PREPARE my_select2 FROM
SELECT name FROM nation WHERE regionkey = ? AND nationkey < ?;

Prepare an insert query:

PREPARE my_insert FROM
INSERT INTO cities VALUES (1, 'San Francisco');