Updating multiple columns using forall dating ladies in abuja

Let us start with a simple table: UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1200 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1200 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1250 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1250 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; We are no longer setting all the salary fields to the same value, so we can’t collapse it into a single statement.

But we can group the updates according to the value being set, and then do one UPDATE statement per distinct value.

The sub-query can refer to old values of the current row of the table being updated.

you should ensure that the join produces at most one output row for each row to be modified.

A requirement arises in many systems to update multiple SQL database rows.

You use an update query when you have to update or change existing data in a set of records.

Oracle’s MERGE statement is tailor-made for situations when you want to do an "upsert" i.e.

update existing rows in a table or insert new rows depending on a match condition.

clause; columns not explicitly modified retain their previous values.

There are two ways to modify a table using information contained in other tables in the database: using sub-selects, or specifying additional tables in the sub-query that produces as many output columns as are listed in the parenthesized column list preceding it.

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