Oracle merge insert when matched

The MERGE statement allows you to specify a condition to determine whether to update data from or insert data into the target table. Merge, when matched insert. An example of a constant filter predicate is ON ( 0=). Oracle sql merge to insert and delete but not.

Say you would like to take transformed data and use it to update our dimension table. The additional DELETE WHERE clause will delete only those rows that were matched , already in the destination table, and meet the criteria of the DELETE WHERE clause. MERGE INTO destination d USING source s ON (s.id = d.id) WHEN MATCHED THEN UPDATE SET d. Note: Primarily of value when moving large amounts of data in data warehouse situations. The merge _ insert _clause specifies values to insert into the column of the target table if the condition of the ON clause is false. If the insert clause is execute then all insert triggers defined on the target table are activated.

MERGE kann jedoch ab Oracle10g noch mehr. So sollen die Zeilen der DEPTNO nicht mehr in die Zieltabelle gemischt werden. CASE WHEN deleteMe=THEN target. What is the MERGE Statement?

It’s a bit smarter than an INSERT INTO SELECT statement. The merge _update_clause specifies the new column values of the target table. You can specify these two clauses in either order. To insert all of the source rows into the table, you can use a constant filter predicate in the ON clause condition. You should use the MERGE statement to select rows from one or more sources for insert or update of one or more tables.

Is there a way to use oracle merge to insert and delete but not update? I have a table representing a set of values related to a single row in another table. I could change the set of values by deleting them all and adding back the new set, or by selectively deleting some and adding others, but I am interested in making it a single statement if.

If the update clause is execute then all update triggers defined on the target table are activated. Both the when matched and when not matched clauses of merge are optional. So you can have insert only or update only merges. Skip to Main Content. The condition can refer only to the data source table.

If you specify both, then they can be in either order. To use it, you need to state how values in the target table relate to those in the source in the join clause. Then add rows in the when not matched clause. And update them using when matched.

A MERGE request can specify at most one WHEN MATCHED clause and at most one WHEN NOT MATCHED clause. When a MERGE request specifies a WHEN MATCHED and a WHEN NOT MATCHED clause, then the INSERT and UPDATE specifications of those clauses must apply to the same AMP. The value specified for the primary index in the INSERT. Updated' DELETE WHERE d. When the person_id does not match, the rows from the people_source table are added to.

Below is a generalized format for the merge statement. MERGE targetTable Using sourceTable ON mergeCondition WHEN MATCHED THEN updateStatement WHEN NOT MATCHED BY TARGET THEN insertStatement WHEN NOT MATCHED BY SOURCE THEN deleteStatement The merge statement works using two tables, the sourceTable and targetTable.