DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopSelect from Update, Delete, and Merge• Builds on SELECT FROM INSERT delivered in V8• Like the INSERT statement, the FROM clause of a SELECTstatement will now allow an UPDATE, DELETE, or MERGEstatement:<strong>10</strong>© 2011 IBM Corporation
Migration Planning WorkshopSelect from Update, Delete, and MergeSELECT athlete, score FROM FINAL TABLE(UPDATE events SET SCORE=SCORE+<strong>10</strong>WHERE EVENT=‘BOXING’);SELECT MEMBER_ID, UPSERT_INDICATOR FROM FINAL TABLE(MERGE INTO MEMBER_PROFILE AS AINCLUDE (UPSERT_INDICATOR CHAR(1))USING (VALUES (:col1, :col2, :col3) ) AS B(MEMBER_ID, MEMBER_NAME, MEAL_PREFERENCE)ON (A.MEMBER_ID = B.MEMBER_ID)WHEN MATCHED THENUPDATE SET A.MEMBER_NAME = B.MEMBER_NAME,A.MEAL_PREFERENCE = B.MEAL_PREFERENCE,UPSERT_INDICATOR = 'U'WHEN NOT MATCHED THENINSERT (MEMBER_ID,MEMBER_NAME,MEAL_PREFERENCE,UPSERT_INDICATOR)VALUES (B.MEMBER_ID, B.MEMBER_NAME, B.MEAL_PREFERENCE, 'I')NOT ATOMIC CONTINUE ON SQLEXCEPTION);• First example shows SELECT returning data from the nested UPDATE• Second example shows SELECT returning data from the nested MERGE with an INCLUDEcolumn.– This include column returns the compare column from the ON clause and an indicator of whether therow was Updated or Inserted.11© 2011 IBM Corporation
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