When do you use MERGE statement in Oracle?
USING Use the MERGE statement to select rows from one or more sources for update or insertion into a table or view. You can specify conditions to determine whether to update or insert into the target table or view. This statement is a convenient way to combine multiple operations.
Why do I need to merge two rows in SQL?
The reason for me in merging two rows is because the table I’m referring to stores transactions in both Debit and Credit. therefore, whenever a transaction occurs, there will always be two new records inserted into the table, one for Debit and one for Credit. What I need to do is merge those two related transactions, for example:
How to calculate rowcount in Oracle merge SQL?
This statement is a convenient way to combine multiple operations. It lets you avoid multiple INSERT, UPDATE and DELETE DML statements.” If you search for term “oracle merge sql rowcount” you will notice that there is alot of people out their asking for how to capture the number of rows affected by a MERGE statement divided by each DML operations.
How to combine multiple rows into one row in Oracle?
The function that you need is listagg () with does string concatenation when aggregating. You also need to first concatenate the ids together: By the way, the result data is incorrect (because the id is the same on all three rows). This probably accounts for the downvote.
When to use the MERGE statement in DML?
Use the MERGE statement to select rows from one or more sources for update or insertion into a table or view. You can specify conditions to determine whether to update or insert into the target table or view. This statement is a convenient way to combine multiple operations. It lets you avoid multiple INSERT, UPDATE, and DELETE DML statements.
Can a MERGE statement update the same table multiple times?
That is, you cannot update the same row of the target table multiple times in the same MERGE statement. Oracle Database does not implement fine-grained access control during MERGE statements.
How to merge table name to table name in Oracle?
The syntax of a MERGE statement in Oracle looks like this: MERGE INTO table_name USING table_name ON (condition) WHEN MATCHED THEN update_clause DELETE where_clause WHEN NOT MATCHED THEN insert_clause [LOG ERRORS log_errors_clause reject_limit ]