Update statement in ms access jdbc not updating the row top sex and dating chatsites
The MERGE statement supports inserting and updating rows in a table with a single operation.
In order to accomplish this the MERGE statement requires both a Source and Target table.
When the “WHEN NOT MATCHED” condition is met the unmatched rows in the Source table were inserted into the Target table.
Can the MERGE statement be used to delete records from a table? To see how this works let’s suppose we have a business requirement to delete rows from the Target table of the MERGE statement when they don’t exist in the Source table.
I will use the following code to create my Source and Target table: With this code I created two tables.
The other table, New Inventory, is the Source table.
With the introduction of the MERGE statement with SQL Server 2008 you can perform either an INSERT or UPDATE statement using a single MERGE statement.
Being able to use the MERGE statement to perform inserts or updates to a table makes it easier to code your UPSERT logic in TSQL.
My Source table identifies the records that will be used to determine if a new record needs to be inserted into my Product table.
The Source table is also used to determine if an UPDATE needs to be performed against any existing records in my Product table.
In this article I discuss how to use the MERGE statement to UPDATE, INSERT and DELETE records from a target table.