If you will not use all of the rows in the staging table, you can filter the DELETE and INSERT statements by using a WHERE clause to leave out rows that are not actually changing.
The following tables show the exams and the corresponding courses for OCA.
Students are introduced to the utilization of some of the Oracle-supplied packages.
This course is designed to give students a firm foundation in basic administration of Oracle Database 11g.
Using a single transaction also reduces the number of commits, which saves time and resources.
If you are overwriting all of the columns in the target table, the fastest method for performing a merge is by replacing the existing rows because it scans the target table only once, by using an inner join to delete rows that will be updated.