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You can indicate unknown data by setting values to NULL.

This works only if a column is nullable, meaning that it is not defined as NOT NULL.

You use an append query when you need to add new records to an existing table by using data from other sources.

If you need to change data in an existing set of records, such as updating the value of a field, you can use an update query.

Returns dates from 2-Feb-17 through 1-Dec-17 (ANSI-89).

clause allows you to update data in one or more columns determined by a list of comma-separated assignments.

In Oracle, when you need to update values of certain records from one table, and the value and the records to update are determined by a second table, you can use a subquery in the update statement to achieve the updating efficiently.

updating 2 tables-85updating 2 tables-7updating 2 tables-40

For more information about update queries or make-table queries, or for general information about other ways to add records to a database or change existing data, see the See Also section.

In this scenario, accounting only sent me two records, but in the real life situation I ran into, it was over 10,000 records.

Also, this scenario's master table has only 5 records; my real master table has close to 1,000,000 records.

My first attempt, which was incorrect, was this: The problem with this update statement was that I realized it would update all 5 records instead of just the 2 records accounting wanted to update; this would result in 103 and 104 being updated to the updated amounts, but all other amounts wiped out to null value.

To remedy that, we could throw in a where clause to the update statement, as below: -- Better example, but still inefficient update master_table m set m.invoice_amount=( select a.updated_invoice_amount from data_from_accounting a where m.job_number=a.job_number ) where m.job_number in( select a2.job_number from data_from_accounting a2 where m.job_number=a2.job_number ); This would correctly update the records I wanted to update while leaving the others alone, but this query is a little inefficient as it needs to go through the data from accounting twice.




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