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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.
6 Δεκ 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.
15 Ιουν 2017 · Update statement with correlated subquery that intentionally passes multiple rows. I am trying to update one table using a subquery that totals several transactions from another table. I cannot figure how to link specific rows from my parent table to the rows in my subquery.
Update using correlated subquery. This statement uses a correlated subquery to update a single column across multiple rows in the FLIGHTS table. It increases the duration of all BA flights by thirty minutes. The subquery returns all flights with OPERATING_CARRIER_CODE set to 'BA'. This result is used as the predicate value in the UPDATE statement.
2 Φεβ 2021 · Think of the with clause as defining an on-the-fly view. So even though a table alias matches the named subquery, you've not accessed the CTE in the query itself. Thus the query never references the CTE's contents. For example, the query below uses a with clause having the same name as a table alias, but the main query doesn't select from the ...
This chapter contains these sections: About Queries and Subqueries. Creating Simple Queries. Hierarchical Queries. The UNION [ALL], INTERSECT, MINUS Operators. Sorting Query Results. Joins. Using Subqueries. Unnesting of Nested Subqueries.
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.
