Updating multiple columns in oracle


venkotch and budim have given good examples of how to update multiple columns simultaneously.All INSTEAD OF triggers are fired for each row and you cannot narrow down the event by column.What I was saying is you can't update rows in more than one table with one update statement (in Oracle or SQL Server)."What you propose only works if I want to update all rows in the table being updated to the same value in all the other tables." UPDATE statements like "UPDATE carts c SET c.format_code = (SELECT DISTINCT p.format_code FROM prices p WHERE p.item_id = c.cart_item_id)" update individual rows in carts according to the restriction critera in the sub-select, so they are not all updated to the same value - they are individual set as you require.I received the following error: ORA-01779: cannot modify a column which maps to a non key-preserved table You can update multiple rows from anywhere you want in one UPDATE statement, but you can't update two tables at the same time (the accepted answer given does not make sense).Oracle is expecting the SET keyword straight after the one and only one table name.



What you propose only works if I want to update all rows in the table being updated to the same value in all the other tables.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.The differences in syntax are quite dramatic compared to other database systems like MS SQL Server or My SQL. Updates based on two or more common columns are normally used for tables where multiple columns work together as a primary key (known as composite primary key).

In this article, we are going to look at four scenarios for Oracle cross table update. Category_ID) where exists ( select * from Categories b where b. These columns uniquely identify a record in a table.

It would look like: UPDATE carts c SET c.format_code = (select p.format_code from PRICES p where C.table_key = P.table_key) WHERE c.cart_item_id IN (SELECT t.cart_item_id from prices r, carts t WHERE r.


Updating multiple columns in oracle comments


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