there are two circles that represent two tables and can be considered as Source and a Target. The MERGE statement tries to compare the source table with the target table based on a key field and then do some of the processing. The MERGE statement actually combines the INSERT, UPDATE, ...
there are two circles that represent two tables and can be considered as Source and a Target. The MERGE statement tries to compare the source table with the target table based on a key field and then do some of the processing. The MERGE statement actually combines the INSERT, UPDATE, ...
As MERGE statement in SQL, as discussed before in theprevious post, is the combination of threeINSERT,DELETEandUPDATEstatements. So if there is aSource tableand aTarget tablethat are to be merged, then with the help of MERGE statement, all the three operations (INSERT, UPDATE, DELETE) can ...
-- WHEN NOTMATCHED BY SOURCE - 如果匹配不成功 (SOURCE 中没有这⼀条记录但是 TARGET 表有，说明 SOURCE 表可能把这条数据删除了，所以 TARGET 也应该删除) -- MERGE statement with the join conditions specified correctly.USE tempdb;GO BEGIN TRAN;MERGE Target AS T USING Source AS S ON (T.Em...
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 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. ...
3.2 MERGE statement overview When using the merge statement, remember that you can have all three primary DML statements, insert, update and delete. One table as the source where new or updated rows are provided along with the relevant columns, or, you can have deleted rows too by specifying...
Specifies one or more table hints to apply on the target table for each of the insert, update, or delete actions done by the MERGE statement. The WITH keyword and the parentheses are required. NOLOCK and READUNCOMMITTED aren't allowed. For more information about table hints, seeTable Hints...
1)Tell me how could i use lock hint during insert and update by merge statement? 2)Can i use any lock hint for insert statement? 3)what lock hint is used for delete data from table ? 4)What isolation i should use? This is code by which data will be inserted and update into t...
如果对 target_table 定义了任何 INSTEAD OF INSERT 触发器,则不会执行插入操作。 而是相应地填充表。 备注 与单独的 INSERT 、 UPDATE 和 DELETE 语句不同,触发器内部由 @@ROWCOUNT 反映的行数可能更高。 任何 AFTER 触发器(无论触发器捕获的数据修改语句如何)内的 @@ROWCOUNT 都将反映受 MERGE 影响的总行数...
可以在 SELECT、INSERT、UPDATE、DELETE 和MERGE 语句中为单个表引用指定锁提示。 提示指定数据库引擎实例用于表数据的锁类型或行版本控制。 当需要对对象所获得锁类型进行更精细控制时,可以使用表级锁提示。 这些锁提示覆盖会话的当前事务隔离级别。 备注 启用优化锁定时,不建议使用锁定提示。 尽管遵循表和...