Sql queries for updating a column
If the item already exists, instead update the stock count of the existing item.
To do this without failing the entire transaction, use savepoints: BEGIN; -- other operations SAVEPOINT sp1; INSERT INTO wines VALUES('Chateau Lafite 2003', '24'); -- Assume the above fails because of a unique key violation, -- so now we issue these commands: ROLLBACK TO sp1; UPDATE wines SET stock = stock 24 WHERE winename = 'Chateau Lafite 2003'; -- continue with other operations, and eventually COMMIT; If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.
The positioned update statement depends on the cursor and any tables the cursor references.
You can compile a positioned update even if the cursor has not been opened yet.
Specifying DEFAULT for the update value sets the value of the column to the default defined for that table.
Attempt to insert a new stock item along with the quantity of stock.
In my first TSQL script above, when I create the TOY table, there is typo in the first Toy Name.
I created a Toy Name of “Magic Wnd” when it should have been “Magic Wand”.
If you want to review the complete syntax of the UPDATE statement then please refer to Books Online.
To properly show you how to use the UPDATE statement I will need to create a few tables to hold some sample data. Below is the code to create my Toy table: In order to show you how to UPDATE a table from data in another table I need to build a second sample data table that I will call New Toy Price.