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2011.01.28,Fri
■概要
テーブルAとテーブルBを結合条件で結合させ、テーブルAにテーブルBのレコードがなければINSERT、
レコードがあればUPDATEを行う。

■構文
MERGE INTO テーブルA
USING テーブルB ON ( 結合条件 )
WHEN MATCHED THEN
UPDATE SET 項目
WHEN NOT MATCHED THEN
INSERT ( 項目)
VALUES ( 項目)
;










■使用例
※使用テーブル
product_mst
id product price
1 書籍 1000
2 CD 3000
update_mst
updt_id updt_product updt_price
8 書籍 1500
9 DVD 5000

※目的
product_mstとupdate_mstを結合させ、update_mstに存在するレコードがproduct_mstに存在しない場合、product_mstにデータを挿入し、product_mstに存在する場合は更新する。

※SQL
MERGE INTO product_mst AS a
USING update_mst AS ON ( a.product = b.updt_product )
WHEN MATCHED THEN
UPDATE SET a.price = b.updt_price
WHEN NOT MATCHED THEN
INSERT ( a.id, a.product, a.price )
VALUES ( b.updt_id, a.updt_product, a.updt_price )
;










※結果
product_mst
id product price
1 書籍 1500
2 CD 3000
9 DVD 5000
update_mst
updt_id updt_product updt_price
8 書籍 1500
9 DVD 5000


■注意事項

・MERGE文はoracle9iから組み込まれたoracle独自のSQL文のため、バグが多い。
少なくともoracle9i環境でやるのはやめた方が良いかも。
・MERGE文でUPDATEできるのは、ON句で参照していない列のみ
※キーが更新されないため 
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