You can determine the number of rows that will be inserted by running the following Oracle SELECT statement before performing the insert. I know that you use the Oracle INSERT statement to insert information in the database, but how do I make sure that I do not enter the same client information again?
If an ID exists, I would like to update the VALUE, else insert the new VALUE with a new ID. The solution can be with an SQL query, a stored procedure or Java code, but it must be transactionally safe and must not use exception handling for flow control.
With this type of insert, you may wish to check for the number of rows being inserted.
Once the trigger is created, entering the following SQL statement: A trigger is either a stored PL/SQL block or a PL/SQL, C, or Java procedure associated with a table, view, schema, or the database itself.
Oracle Database automatically executes a trigger when a specified event takes place, which may be in the form of a system event or a DML statement being issued against the table.
Because the trigger uses the clause, it might be executed multiple times, such as when updating or deleting multiple rows.
You might omit this clause if you just want to record the fact that the operation occurred, but not examine the data for each row.