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If you want to update specific rows (ie where the IDs match) you probably want to do a coordinated subquery. However, since you are using Oracle, it might be easier to create a materialized view for your query table and let Oracle's transaction mechanism handle the details.
Subquery Method. The first option is to do an update of the DEST_TAB table using a subquery to pull the correct data from the SOURCE_TAB table. Notice the EXISTS predicate to exclude rows from the DEST_TAB table with no matching row in the SOURCE_TAB table.
27 maj 2011 · Looking up the UPDATE statement syntax on oracle, I found the following link, which shows that you can use a subquery in place of a table name. When I tried to write the query like this, I got a "ORA-01779: Cannot modify a column which maps to a non key-preserved table". UPDATE. (. SELECT.
6 gru 2017 · Learn about several methods to update data using subqueries in UPDATE statements to make them more effective and easier to maintain in Oracle SQL.
Introduction to the Oracle subquery. A subquery is a SELECTstatement nested inside another statement such as SELECT, INSERT, UPDATE, or DELETE. Typically, you can use a subquery anywhere that you use an expression. Consider this following subquery example that uses the productstable from the sample database.
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5 gru 2014 · Essentially you create a table type, then create a variable with that table type, then do a select for update to get all of the data that you want to update, then do a forall update to update the data.
