Tags

, , , , ,

Sometimes we have a scenario where all the data that needs to be updated in TABLE1 is available in a different table TABLE2.

Here the situation is that we have more than one column to be updated in TABLE1 from TABLE2.

Your UPDATE query looks like below.
UPDATE TABLE1 A
  SET (COL11, COL12, COL13) =
      ( SELECT
        COL21, COL22, COL23
        FROM TABLE2 B
        WHERE B.COL20 = A.COL10
       )
WHERE  COL14    = 'A'
  AND  COL15    = 123
;
Note: You need to ensure that the TABLE2 retrieves only one row with the condition 
used to check from it. (WHERE  B.COL20 = A.COL10)

Important SQL CODES and ABEND CODES
SORT JOIN – TO JOIN TWO FILES BASED ON A KEY
KNOW YOUR MAINFRAME
REXX – INITIAL SETUP
DB2 SQL Query to read COMP (COBOL) data stored in CHAR column
DB2 Performance – Using SET vs SYSDUMMY1 table
DB2 Performace – Predicates Processing Order
DB2 External Stored Procedures
DB2 UPDATE QUERY – UPDATE TABLE1 FROM TABLE2 DATA
DB2 PERFORMANCE ISSUE (When using EXISTS)
HOW DOES DB2 INTERNALLY (PHYSICALLY) STORE THE DATA
HOW DO YOU FIND WHO HAS ACTUALLY LOADED THE DB2 TABLE RECENTLY
TERMINATE A STOPPED DB2 UTILITY
SELECT UNIQUE RECORDS USING “GROUP BY”
DB2 and SQL INTERVIEW QUESTIONS
DB2 TIPS
Optimistic Locking vs. Pessimistic Locking
DB2 BIND OPTIONS and ISOLATION
Is SCHEMA name necessary for DYNAMIC QUERY
DB2 SQL – REPLACE CHARACTERS WITH ACCENTS (NON ENGLISH ALPHABETS)
Advertisements