MERGE [AS TARGET] USING [AS SOURCE] ON (TARGET.CodeID = SOURCE.CodeID) --When records are matched, update --the records if there is any change [WHEN MATCHED THEN ] UPDATE SET TARGET.TaxCode = SOURCE.TaxCode; --When no records are matched, insert --the incoming records from source ...
基于源表对目标表做Insert,Update,Delete操作 MERGE语句的基本语法: MERGE 目标表 USING 源表 ON 匹配条件 WHEN MATCHED THEN 语句 WHEN NOT MATCHED THEN 语句; 以上是MERGE的最最基本的语法,语句执行时根据匹配条件的结果,如果在目标表中找到匹配记录则执行WHEN MATCHED THEN后面的语句,如果没有找到匹配记录则执行...
There are a few aspects using which you can optimize the performance of your MERGE statements. Having said that, it means now you can write all your DML statements (INSERT, UPDATE, and DELETE) combined in a single statement. From a data processing perspective, this is quite helpful as it ...
操作中,只能允许执行 UPDATE 或者 DELETE 语句。...在 MERGE NOT MATCHED 操作中,只允许执行 INSERT 语句。...一个 MERGE语句中出现的MATCHED操作,只能出现一次 UPDATE 或者 DELETE 语句,否则就会出现下面的错误: An action of type '...
INSERT INTO MM VALUES (1, 'A'); INSERT INTO MN VALUES (1, 'B'); 执行: MERGE INTO MN A USING MM B ON(=) WHEN MATCHED THEN UPDATE SET = WHEN NOT MATCHED THEN INSERT VALUES(, ); ON(=) 报错,原因是on子句的使用的字段不能够用于update,即Oracle不允许更新用于连接的列 ...
MERGE INTO target_table USING source_table ON condition WHEN MATCHED THEN UPDATE SET column1 = value1, column2 = value2, ... WHEN NOT MATCHED THEN INSERT (column1, column2, column3, ...) VALUES (value1, value2, value3, ...); 复制代码 因此,INSERT语句用于简单地将新数据插入到表中,...
--确定目标表 Merge Into Demo_AllProducts p --从数据源查找编码相同的产品 using Demo_Shop1_Product s on p.DCode=s.DCode --如果编码相同,则更新目标表的名称 When Matched and P.DName<>s.DName Then Update set P.DName=s.DName --如果目标表中不存在,则从数据源插入目标表 When Not Matched By...
8whenmatchedthenupdatesetName=source.Name 9whennotmatchedtheninsert(UnitMeasureCode,Name)values(source.UnitMeasureCode,Name) 10output deleted.*,$action,inserted.*intoMyTempTable; 11end 12go 这个语句使用merge修改存储过程,这个语句中又出现我不太了解的关键字using和action。Using是用来指定和表InsertUnitMeasu...
MERGE INTO products p USING newproducts np ON (1=0) WHEN NOT MATCHED THEN INSERT VALUES (np.product_id, np.product_name, np.category) WHERE np.category = 'BOOKS' update的写法: 今天改写一个T_sql语句到PL/SQL中,原句是通过两个表关联查询取出数据,然后更新,在oracle中是不支持这样的写法的。
WHEN 子句(WHEN MATCHED、WHEN NOT MATCHED BY TARGET 和 WHEN NOT MATCHED BY SOURCE)基于 ON 子句的结果和在 WHEN 子句中指定的任何其他搜索条件指定所要采取的操作。 OUTPUT 子句针对插入、更新或删除的目标中的每一行返回一行。 相关示例: A.使用简单的 MERGE 语句执行 INSERT 和 UPDATE 操作 ...