merge statement in teradata

Oracle introduced the merge command in 9i,With this merge you can perform inserts and updates operations on a table in one SQL statement at the same time. Of course update or insert is based on your specified conditions, Merge into can be used to update the A table with the B table, if not in a table, then the B table

Original: SQL Server-Use the Merge statement to synchronize contrast between table dataThere are many ways to implement synchronization between table data, such as deleting and then re-insert, or writing some other branch criteria to determine whether to insert or UPDATE. Included in the SSIS package is the ability to synchronize between table data through a combination of various tasks such as Lookup, Cond

How to understand the merge statement in T-SQL (II)Written in front of the words: How to understand T-SQL in the merge statement, basically the merge statement to talk about, in the back of the article, thrown a few knots, at that

The following example captures the data returned from the OUTPUT clause of the MERGE statement and inserts the data into another table. The MERGE statement updates the Quantity column of the ProductInventory table based on the order processed in the SalesOrderDetail table. This example captures updated rows and inserts

Written in front of the words: How to understand T-SQL in the merge statement, basically the merge statement to talk about, in the back of the article, thrown a few knots, at that time did not want to understand how to use the text expression, this article to answer a few knot, but also a "unrestrained" text, Let's see

replace the total product name with the store's product name if the product name is not. If the Total Product table does not exist, add it. Optional: If the list does not exist, delete the rows that are not in the store from the Total Product table. If so, the total product table and the store table are fully synchronized. The rows of the destination table may not need to be deleted in the actual operation. Statement as follows: Copy Code c

Source of original article (http://blog.csdn.net/lichkui/article/details/4306299)The merge statement is a new syntax for merging the UPDATE and INSERT statements oracle9i. Through the merge statement, the other table is queried based on the join criteria of one table or subquery, and the connection condition matches th

This command uses a statement to complete the update and insert data for a table from one or more data sources. Oracle 9i, the command must specify both update and insert keywords, and Oracle 10g makes the following changes. 1,insert and UPDATE are optional 2,update and inserts can be followed by a WHERE clause 3, in which you can use constants to insert all rows into the target table, and you do not need to connect to the source and destination table

SQL Server 2008 will contain a new syntax for merging two rowset (rowset) data. According to a source table for another data table for deterministic INSERT, update and delete such a complex operation, using the new merge statement, the developer with a command can be completed. There are three steps to make when synchronizing information to two tables. The first thing to do is to process any new rows that n

MySQL inserts or updates (similar to Oracle's merge statement), oraclemerge If the record does not exist in MySQL, insert the statement. If the record does not exist, update the statement. You can use the following statement: Update a field: Insert into tbl (columnA, colu

Here are a few ways to combine the new T-SQL statement merge of output with 2008: Create a new table below: Copy Code code as follows: CREATE TABLE Book ( ISBN varchar () PRIMARY KEY, Price Decimal, Shelf int) CREATE TABLE Weeklychange ( ISBN varchar () PRIMARY KEY, Price Decimal, Shelf int) CREATE TABLE Bookhistory ( Action nvarchar (10), NEWISBN varchar (20),

MERGE is a composite statement used to implement INSERT, UPDATE, and DELETE operations at a time. Syntax: merge into table/view using (TABLE/VIEW/SUBQUERY) ON (condition) [when metched then update set column = expr/DEFAULT [WHERE condition] www.2cto.com [delete where condition] [when not matched then insert [(column,...)] VALUES (v ,...) [WHERE condition] [log er

Oracle merge statement merge into table name a using (select? As field 1 ,? As field 2 ,..... from dual) B on (. field 1 = B. field 1 and ....) (Judgment condition) when matched then update set field 1 = Field 1 ,...... when not matched then insert (Field 1, Field 2 ,...) values (B. field 1, B. field 2 ,....) example of www.2cto.com: Table Name: TR_RUNNING_MONITO

Label:Data that already exists in the database is not overwritten or deleted, and the data is updated to another table as a single table.Merge into Course as TargetUsing (values(1, ' Economics ', 3),(2, ' Literrature ', 3),(3, ' chemistry ', 4))As Source (courseid,title,credits)On Target.courseid =source.courseidWhen not matched by Target thenInsert (Title,credits)Values (title,credits);Merge into Student as TargetUsing (values(1, ' Tibbetts ', ' Donn

Build a test environment first: Use Tempdbgoif object_id (' T1 ') was NOT null drop table t1if object_id (' T2 ') was NOT null drop table T2gocreate tabl E T1 (ID1 int,val1 varchar) CREATE TABLE T2 (ID2 int,val2 varchar ()) Goinsert into T1select 1, ' A ' UNION allselect 2, ' B ' UNION allselect 3, ' C ' now our goal is to synchronize the T2 table with the T1 table, I directly post the complete merge statement