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Updates Based on Queries. This article describes how a table can be updated using data from another table. Setup; Subquery Method; Inline View Method; MERGE Statement Method; Related articles. MERGE Statement; Setup. The DEST_TAB table contains 10,000 rows.
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.
6 gru 2017 · Using a subquery in an UPDATE statement can be a good way to improve the maintainability of your queries. It can also reduce the number of steps required to update your data by compressing two or more queries into a single query.
This Oracle tutorial explains how to use the Oracle UPDATE statement with syntax, examples, and practice exercises. The Oracle UPDATE statement is used to update existing records in a table in an Oracle database. There are 2 syntaxes for an update query in Oracle.
30 maj 2011 · You could create a trigger on tableB that updates tableA every time field_2 on tableB is updated. Check here for more info on creating triggers - http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14251/adfns_triggers.htm#BABCIBBJ
This tutorial shows you how to use Oracle UPDATE statement to change existing values in a table. It also provides some practical examples of updating data.
You can use the UPDATE WHERE CURRENT OF statement after a fetch from an open cursor (including fetches done by a cursor FOR loop), provided the associated query is FOR UPDATE. This statement updates the row that was just fetched.
