Question

Hi i want to make a stored procedure that will join 2 table and will check some values to update.
We will use FETCH to make a update process for each record.

But we are considering performance. Is this a bad idea to use FETCH?

Example:

Table1
BookID
BookName

Table2
RatingID
BookName
BookID

We will join this two tables like this.

SELECT * FROM Table2
LEFT JOIN Table1 ON Table2.BookName = Table1.BookName 
WHERE Table2.BookID = 0

For each record which this query pulls, we will make an UPDATE to set Table1’s bookID to Table2’s BookID column.

Answer 1

Yes.

You should nearly always strive to avoid cursors in SQL Server and use set based alternatives instead.

The UPDATE statement does support JOINs to other tables.