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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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In this article I will show you a number of different ways to use the UPDATE statement to modify the data in your SQL Server tables.

Finally, I came up with a solution that works very efficiently, even with my large 1,000,000-record table.

-- Best practice update ( select m.invoice_amount, a.updated_invoice_amount from master_table m, data_from_accounting a where m.job_number=a.job_number ) set m.invoice_amount=a.updated_invoice_amount; Note that the job number field in both tables in this example scenario are both primary keys.

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.

I ran into a situation today when I need to update 10,000 records in a master table totaling 1,000,000 rows, and the value that I'm going to use comes from the accounting department. In sum, accounting wants to update job 103's invoice amount to 0 and job 104's invoice amount to 0, while leaving all other amounts the same.




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