sqlteradata

Teradata Update Table from Select Statement


Sorry if the title is unclear. Basically I'm trying to select certain records from multiple tables then update a certain column value for the returned records.

T-SQL Implementation

    UPDATE 
        CUSTOMERS
    SET
        LIKES_US = 'Y'
    FROM
        RESTAURANT REST INNER JOIN CUSTOMERS CUST ON REST.LINK_ID = CUST.LINK_ID
        WHERE
        REST.REST_TYPE = 'Diner' AND CUST.LIKES_US IS NULL

Oracle

    UPDATE 
       (SELECT CUST.LIKES_US
        FROM CUSTOMERS CUST INNER JOIN RESTAURANT REST ON CUST.LINK_ID=REST.LINK_ID
        WHERE REST.REST_TYPE = 'Diner' AND CUST.LIKES_US IS NULL) NEW_CUST
    SET
        NEW_CUST.LIKES_US = 'Y';

I am tried doing the same thing in Teradata as I did in Oracle but I get the following error:

Executed as Single statement.  Failed [3707 : 42000] Syntax error, expected something like a name or a Unicode delimited identifier or an 'UDFCALLNAME' keyword between the 'UPDATE' keyword and '('. 
Elapsed time = 00:00:00.003 

STATEMENT 1: Unknown failed. 

I looked online for the solution but had no luck.


Solution

  • Have you tried the following syntax with Teradata:

    UPDATE CUSTOMERS C1
      FROM (SELECT C2.LINK_ID
              FROM CUSTOMERS C2
             INNER JOIN RESTAURANTS R2
                ON C2.LINK_ID = R2.LINK_ID
            WHERE R2.REST_TYPE = 'DINER'
              AND C2.LIKES_US IS NULL) D1
       SET LIKES_US = 'Y'
     WHERE C1.LINK_ID = C2.LINK_ID