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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.
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 · There are several different ways to use subqueries in UPDATE statements. Let’s take a look at each of them. SET and Subquery. The first method we will look at is using a subquery in the SET clause of an UPDATE statement. Let’s say we had a table of products that looked like this: [table id=29 /]
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.
30 maj 2011 · UPDATE table_a a. SET field_2 = ( SELECT field_2. FROM table_b b. WHERE b.id = a.id ) ; Add a comment. update user1.table1 a.
You can use a table_collection_expression to update rows in one table based on rows from another table. For example, you could roll up four quarterly sales tables into a yearly sales table. t_alias. Specify a correlation name (alias) for the table, view, or subquery to be referenced elsewhere in the statement.
To changes existing values in a table, you use the following Oracle UPDATE statement: UPDATE table_name SET column1 = value1, column2 = value2, column3 = value3, ... WHERE condition; Code language: SQL (Structured Query Language) ( sql )
