oracle 的merge into 的说明

Posted 2020-09-22 AlisonGavin

Oracle中，要实现相同的功能，要用到Merge into来实现（Oracle 9i引入的功能），其语法如下：

MERGE INTO table_name alias1 
USING (table|view|sub_query) alias2
ON (join condition) 
WHEN MATCHED THEN 
    UPDATE table_name 
    SET col1 = col_val1, 
           col2 = col_val2 
WHEN NOT MATCHED THEN 
    INSERT (column_list) VALUES (column_values);