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Updating multiple tables in oracle

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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.This is the syntax: update (select T1.* from T1, T2 where .. They require a join condition between T1 and T2, and a unique index on the join column in T2 to assure that the select returns at most one column per row in T1.Unfortunately for you there is another limitation that says, that only columns in one of the tables can be updated (T1 here).

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UPDATE summary_data SET current_category = (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id) WHERE EXISTS (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id); If you want to test your skills using the SQL UPDATE statement, try some of our practice exercises.

These exercises allow you to try out your skills with the UPDATE statement.

Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.

We are going to update column DESCRIPTION and PICTURE in table Categories_Test by using data in table Categories, based on data in the common column CATEGORY_ID. Update data in a column in table A based on a common column in table B. Update data in two columns in table A based on a common column in table B. Conditionally update data in table A based on a common column in table B. No portion may be reproduced without my written permission.