1、根據表newproducts的product_id欄位是否匹配來updates表products的資訊:
sql> merge into products p
2 using newproducts np
3 on (p.product_id = np.product_id)
4 when matched then
5 update
6 set p.product_name = np.product_name,
7 p.category = np.category;
2、根據表newproducts來更新表products資料, 但必須欄位category也得同時匹配上:
sql> merge into products p
2 using newproducts np
3 on (p.product_id = np.product_id)
4 when matched then
5 update
6 set p.product_name = np.product_name
7 where p.category = np.category;
3、 oracle 10g現在支援在on條件中使用常量過濾謂詞. 舉個常量過濾謂詞例子on (1=0). 下面例子從源表插入行到表products, 不檢查這些行是否在表products中存在:
sql> merge into products p
2 using newproducts np
3 on (1=0)
4 when not matched then
5 insert
6 values (np.product_id, np.product_name, np.category)
7 where np.category = 'books'
sql> /
4、下面例子驗證delete子句. 我們從表newproducts中合併行到表products中, 但刪除category為electrncs的行.
sql> merge into products p
2 using newproducts np
3 on (p.product_id = np.product_id)
4 when matched then
5 update
6 set p.product_name = np.product_name,
7 p.category = np.category
8 delete where (p.category = 'electrncs')
9 when not matched then
10 insert
11 values (np.product_id, np.product_name, np.category)
sql> /
摘至：
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