Oracle添加数据时如果数据存在就更新,不存在就插入(merge into 的用法)
需求:添加数据时如果数据存在就更新,不存在就插入
语法:
MERGE INTO table_name t using dual on (//条件 ) WHEN MATCHED THEN UPDATE table_name SET col1 = col_val1 WHEN NOT MATCHED THEN INSERT (column_list) VALUES (column_values);
例子:
merge into user_table t1 using (select 99999 as user_skey2, 9999 as user_id2 from dual) t2 on (t1.user_skey = t2.user_skey2) when matched then update set t1.last_name = '测试' when not matched then insert (t1.user_skey , t1.user_id, last_name, first_name, ba_no , dept_id) values (1111,222, '测试', '林', 111 ,10)
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