Sql server merge how to#
Here is how to get started with the SQL Server MERGE command: Start off by identifying the target table name which will be used in the logic.
Sql server merge update#
Such clashes may arise because merge replication does not require a real-time network connection between the publisher and the subscriber, which raises the very real possibility of one server changing data, and another server later changing the very same data to a different value. In SQL Server 2008 R2 I have a master table called Employees that holds about 20 fields. The SQL Server MERGE command is the combination of INSERT, UPDATE and DELETE commands consolidated into a single statement. The MERGE statement selects the rows from one or more tables (called Source table), and based on conditions specified, INSERT or UPDATE data to another table (called Target table). At any rate, the changes are then synchronized by merge agents that sit on both servers, as well as by a predetermined conflict resolution mechanism in case of clashing data changes. SQL MERGE Statement - SQL Server, Oracle. In this scenario, it is debatable whether the publisher is strictly the primary server, because other servers can also make changes to the data. which does not exist in Target then simply INSERT new record from Source to Target.Merge replication is the most complex type of replication because it allows both publisher and subscriber to independently make changes to the database. Scenario3: If a record is new (TaskId) i.e. INSERT INTO temp_Wrike_Kimble (TaskId,Wrike_Update_Task_URL,ActualMargin,IsProcessed,Rootpid) neither UPDATE / INSERT in the target table -Insert records into target table Scenario2: If a record is already successfully processed in target (IsProcessed= 1), then in the next run, the record having the same (TaskId AND ActualMargin AND BudgetMargin) will be ignored i.e. INSERT INTO temp_Wrike_Kimble (TaskId,Wrike_Update_Task_URL,ActualMargin,BudgetMargin,IsProcessed,Rootpid) INSERT INTO Wrike_Task_Kimble_Log (TaskId,Wrike_Update_Task_URL,ActualMargin,BudgetMargin,IsProcessed,Rootpid) SELECT 1: If in the first run, the record was not processed in target as (IsProcessed= 0), then in next run for the same record, only UPDATE the rootpid of target table to 'test2' -Insert records into the target table And, more importantly, with just a single join. one statement that performs an insert, delete and/or update in a single statement. Using MERGE, you can perform so-called 'upserts', i.e. INSERTED.IsProcessed AS TargetIsProcessed, As of SQL Server 2008, there's a new powerful consolidation statement in the DML toolbox: MERGE. INSERTED.BudgetMargin AS TargetBudgetMargin,
Unpillared and Pushto Collins never interfere his camise Thievish Leighton popple some preterist after edgier. INSERTED.ActualMargin AS TargetActualMargin, Sql Server Merge Replication Schema Changes. INSERTED.Wrike_Update_Task_URL AS TargetWrike_Update_Task_URL, VALUES (SOURCE.TaskId, SOURCE.Wrike_Update_Task_URL,SOURCE.ActualMargin,SOURCE.BudgetMargin,SOURCE.IsProcessed,SOURCE.rootpid) THEN INSERT (TaskId,Wrike_Update_Task_URL,ActualMargin,BudgetMargin,IsProcessed,Rootpid) When no records are matched, insert the incoming records from source table to target table Using Merge query, scenarios 1,2,3 work but scenario 4 does not work. THEN UPDATE SET TARGET.Rootpid = SOURCE.Rootpid I have 4 scenarios to cover so I am using the below Merge query in SQL Server 2016. WHEN MATCHED AND TARGET.Rootpid SOURCE.Rootpid AND TARGET.IsProcessed = SOURCE.IsProcessed
Merge Query: MERGE Wrike_Task_Kimble_Log AS TARGET temp_Wrike_Kimble can have 1 or many records which need to be updated/insert into target table (Wrike_Task_Kimble_Log) Can someone please help? also, I am ok to use other approaches as well like JOINS if it covers all 4 scenarios. I have 4 scenarios to cover so I am using the below Merge query in SQL Server 2016.