How to execute dynamic SQL in Teradata

Question

Is there any way to submit dynamically generated SQL to Teradata? I\'ve written a query that will create the code to denormalize a table. Right now, I am pulling the code

Answer 1

You may find success putting this in a stored procedure using the DBC.SysExecSQL command.

Here is an overly simplified example of a stored procedure in Teradata. Obviously in production would want an error handler defined to address things like invalid database objects. Furthermore, you could return the SQLSTATE back as a parameter to test for whether the stored procedure completed successfully or not.

CREATE PROCEDURE SYSDBA.CommentDatabase
(
  IN P_Database VARCHAR(30),
  IN P_Comment VARCHAR(255), 
  OUT MSG
)
MAIN:  --Label
BEGIN

  DECLARE  P_SQL_TEXT     VARCHAR(4000);

  SET P_SQL_TEXT='COMMENT ON DATABASE '||P_DATABASE||' AS '''||P_COMMENT||'''';
  CALL dbc.SysExecSQL (:P_SQL_TEXT);

  SET MSG = 'Database '||P_DBNAME||' commented successfully!';
END;