Purpose 目的: Use theMERGEstatement to select rows from one or more sources for update or insertion into a table or view. You can specify conditions to determine whether to update or insert into the target table or view. 使用MERGE语句选择行从一个或多个源更新或插入一个表或视图。您可以指定条...
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...
WHERE <insert_condition>;Code language: SQL (Structured Query Language) (sql) In this the MERGE statement: First, specify the target table (target_table) in the INTO clause, which you want to update or insert. Second, specify the source of data (source_table) to be updated or inserted ...
SQL> insert into subs values(905310001,0,531); 已创建 1 行。 SQL> insert into subs values(905320001,1,532); 已创建 1 行。 SQL> insert into subs values(905330001,2,533); 已创建 1 行。 SQL> commit; 提交完成。 SQL> 二、下面先演示一下merge的基本功能 1) matched 和not matched clauses...
SQL>settimingonSQL>updatetest1 t12sett1.object_name=(selectt2.object_name3fromtest2 t24wheret2.object_id=t1.object_id);10000rows updated. Elapsed:00:06:33.35ExecutionPlan---0UPDATESTATEMENT Optimizer=ALL_ROWS (Cost=2923252Card=10011Bytes=790869)10UPDATEOF'TEST1'21TABLEACCESS (FULL)OF'TEST1'(...
oracle-merge用法详解(以示例说明) 在Oracle 10g之前,merge语句支持匹配更新和不匹配插入2种简单的用法,在10g中Oracle对merge语句做了增强,增加了条件选项和DELETE操作。下面我通过一个demo来简单介绍一下10g中merge的增强和10g前merge的用法。 参考Oracle 的SQL Reference,大家可以看到Merge Statement的语法如下:...
520 bytes sent via SQL*Net to client 668 bytes received via SQL*Net from client 3 SQL*Net roundtrips to/from client 7 sorts (memory) 0 sorts (disk) 10000 rows processed 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.
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. MERGE示例 下面我们通过一个示例来介绍一下该如何使用MERGE,我们以Customers表和Orders表为例。数据...
Oracle MERGE语句,MERGE语句,它可以在一个SQL语句中对一张表或一个视图同时做更新或插入操作,避免了多个INSERT、UPDATE和DELETE语句。它可以从一个或多个数据源中选择数据对目标表做更新或插入操作,你可以指定在何种条件下更新或插入目标表或视图。不可以对同一行做多次
SQL Macros – Changing The Query Shape Using Parameters? Leave a reply One thing I learned early on when I was getting to know SQL macros is that we cannot replace each and every part of a SQL statement with a macro. In the same way, working with table SQL macros, we cannot represent...