FORMAT and CAST

In Teradata, the FORMAT keyword is used for formatting a column/expression. For example, FORMAT '9(n)' and 'z(n)' are addressed using LPAD with 0 and space (' ') respectively.

Data typing is done using CAST or direct data type [like (expression1)(CHAR(n))]. This feature is addressed using CAST. For details, see Type Casting and Formatting.

Input: FORMAT with CAST

    
         SELECT
          CAST(TRIM( Agt_Num ) AS DECIMAL( 5 ,0 ) FORMAT '9(5)' )
     FROM
          C03_AGENT_BOND
;

SELECT
          CAST(CAST( Agt_Num AS INT FORMAT 'Z(17)' ) AS CHAR( 5 ) )
     FROM         
          C03_AGENT_BOND
;

SELECT
          CHAR(CAST( CAST( CND_VLU AS DECIMAL( 17 ,0 ) FORMAT 'Z(17)' ) AS VARCHAR( 17 ) ) )
     FROM
          C03_AGENT_BOND
;

Output:

SELECT
          LPAD( CAST( TRIM( Agt_Num ) AS DECIMAL( 5 ,0 ) ) ,5 ,'0' ) AS Agt_Num
     FROM
          C03_AGENT_BOND
;
SELECT
CAST(CAST( Agt_Num AS INT FORMAT 'Z(17)' ) AS CHAR( 5 ) )
FROM
C03_AGENT_BOND
;

SELECT
          LENGTH( CAST( LPAD( CAST( CND_VLU AS DECIMAL( 17 ,0 ) ) ,17 ,' ' ) AS VARCHAR( 17 ) ) ) AS CND_VLU
     FROM
          C03_AGENT_BOND
;

Input - FORMAT 'Z(n)9'

   
        SELECT
          standard_price (FORMAT 'Z(5)9') (CHAR( 6 ))
          ,max_price (FORMAT 'ZZZZZ9') (CHAR( 6 ))
     FROM
          product_t
;

Output:

   
        SELECT
          CAST( TO_CHAR( standard_price ,'999990' ) AS CHAR( 6 ) ) AS standard_price
          ,CAST( TO_CHAR( max_price ,'999990' ) AS CHAR( 6 ) ) AS max_price
     FROM
          product_t
;

Input - FORMAT 'z(m)9.9(n)'

   
        SELECT
          standard_price (FORMAT 'Z(6)9.9(2)') (CHAR( 6 ))
     FROM
          product_t
;

Output:

   
        SELECT
          CAST( TO_CHAR( standard_price ,'9999990.00' ) AS CHAR( 6 ) ) AS standard_price
     FROM
          product_t
;

Input - CAST AS INTEGER

   
        SELECT
          CAST( standard_price AS INTEGER )
     FROM
          product_t
;

Output:

   
        SELECT
         (standard_price)
     FROM
          product_t
;

Input - CAST AS INTEGER FORMAT

   
        SELECT
          CAST( price11 AS INTEGER FORMAT 'Z(4)9' ) (
               CHAR( 10 )
          )
     FROM
          product_t
;

Output:

   
        SELECT
          CAST( TO_CHAR(  ( price11 ) ,'99990' ) AS CHAR( 10 ) ) AS price11
     FROM
          product_t
;

The following GaussDB(DWS) function is added to convert to integer:

     
          CREATE OR REPLACE FUNCTION 
/*  This function is used to support "CAST AS INTEGER" of Teradata.
    It should be created in the "mig_td_ext" schema.
*/
     ( i_param                            TEXT )
RETURN INTEGER
AS
  v_castasint    INTEGER;
BEGIN

   v_castasint := CASE WHEN i_param IS NULL 
                                                THEN NULL         -- if NULL value is provided as input
                                                                WHEN TRIM(i_param) IS NULL 
                                                                                THEN 0                  -- if empty string with one or more spaces is provided 
                                                                ELSE TRUNC(CAST(i_param AS NUMBER))            -- if any numeric value is provided
                                END;

RETURN v_castasint;
END;