Oracle merge with where condition

The MERGE statement allows you to specify a condition to determine whether to update data from or insert data into the target table. Each row in the source table is checked against this condition. If it is true, then the record in the target table is update based on what you specify in the update clause.

The condition can refer only to the data source table. Oracle Database skips the insert operation for all rows for which the condition is not true. You can specify this clause by itself or with the merge_update_clause.

If you specify both, then they can be in either order. Oracle will skip the insert operation for all rows where the condition evaluates to false. If both are specifie then they can be in either order.

Ask Question Asked years, months ago. Active year, months ago. Oracle 10g includes a number of amendments to the MERGE statement making it more flexible.

The following examples use the table defined below. Oracle Merge statement with conditional insert.

This statement compares the people_source and people_target tables by using the person_id column. When the person_id matches, the corresponding rows in the people_target table are updated by using values from the people_source table. The DELETE clause removes all the rows in people_target where title =. Use the MERGE statement to select rows from one table for update or insertion into another table.

Use the ON clause to specify the condition upon which the MERGE operation either updates or inserts. The decision whether to update or insert into the target table is based on a condition in the ON clause. It is a new feature of Oracle Ver.

MERGE INTO catalogsUSING catalogsON (s1.id = s2.id) WHEN MATCHED THEN UPDATE SET s1. WHEN NOT MATCHED THEN INSERT (i item, price) values (s2.i s2.item, s2.price) row(s) updated. The merge statement works using two tables, the sourceTable and targetTable. The targetTable is the table to be modified based in data contained within the sourceTable.

The two tables are compared using a mergeCondition. This condition specifies how rows from the sourceTable are matched to the targetTable. Note: Primarily of value when moving large amounts of data in data warehouse situations. Now you have to take some maxium value of quantity. For example, you only can take 1(accumulative), and you can’t divide the registers of type “A”.

So you have to discard the row with price (because with it you have 130). In the last row (price 11), the Qty sould be put at because you only have left.

Skip to Main Content. I have tried using Merge clause for the same.