![]() ![]() In the above example, Employee is the source table, from where the merge statement pulls the data and Employee1 is the target table where the merge statement Update the data based on ON clause condition that is the ID from both the tables. Now we will use the MERGE statement to update Deptnumber of this table.Įxplanation: In the above output showing 3 rows merged. Rollback the changes in Employee1 table and it consisting only three rows. In this example, we’ll see WHEN MATCHED condition works. Oracle MERGE Statement WHEN MATCHED condition So before this merge statement, Employee1 was holding 3 records and now Employee table consisting of 14 records.Ģ. So while merging the data merge statement checks the condition that ID of source data is matching or not with the ID of target data if it’s not matching then the merge statement inserts the data as a new record. In the above example, Employee is the source table of where the merge statement pulls the data and Employee1 is the target table where the merge statement inserts the data based on the ON clause condition that is the ID from both the tables. (SELECT * FROM Employee) LM ON (LM.Id=M.Id)Įxplanation: In the above output showing 11 rows merged. So in this example, we’ll insert the records which are not present in table Employee1. In the above tables Employee and Employee1 consisting of 14 and 3 records. Oracle MERGEStatement WHEN NOT MATCHED condition For that, we will use the below sample table (Employee&Employee1) with 14& 3records to understand the Oracle MERGE Statement behavior.ġ. In this section, we’ll see the implementation of Oracle MERGE Statement and its behavior. Basically Merge statement takes Data from SourceTable based on condition and performs DML operation on specified condition in ON clause. The MERGE statement is a key technique to perform DML operation (Insert/ Update/ Delete) in a single statement. And Not Matched is just opposite to Matched. Matched tells to start specified DML operation when SourceTable data or conditional data is matching with TargetTable. Matched / Not Matched: This is used to indicate when DML operation should take place. Insert operation performs on this condition. ![]() InsertCondition: This is specifically used for the Insert operation. ![]() Delete operation performs on this condition. Update operation performs on this condition.ĭeleteCondition: This is specifically used for Delete operation. UpdateCondition: This is specifically used for the update operation. Condition: Condition that will be used for the Merge operation. ![]()
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