Once you have data in the temporary table, you can use series of INSERT, UPDATE and DELETE statements to populate other tables in the database. In some scenarios I often add an ID column to the temporary table, and then use the UPDATE…FROM statement to join permanent tables on one or more columns in the temporary table and populate the ID column. After that, I know that any rows in the temporary table where the ID equals NULL are new rows and need to be inserted. The rows where the ID column has a value are considered a match. For those rows I use another UPDATE...FROM statement where I join on the ID column and copy the values from the temporary table to the existing rows. This technique is very useful for data imports using set-based operations rather than row-by-row processing.
Related Q&A from Roman Rehak
There are a few things you can do to tune SQL Server for improved reporting performance. Here are some generic and Reporting Services-specific ...continue reading
Learn about working with image files in SQL Server, including advice on using queries to locate them, in this expert answer.continue reading
Discover the best solutions for encrypting, decrypting and restoring a database in SQL Server 2005.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.