Updating multiple columns in a single update transaction

Posted on 2013-12-10
Last Modified: 2013-12-10
I have a table with many columns.  Some have a default value of 0 and need to set it to null (after removing the constraint of course).

Rather than have multiple update statements that look like this:

update table1 set column1 = null where column1 = 0
update table1 set column2 = null where column2 = 0

Is there a way to wrap these up into a single update statement or transaction with multiple where clauses?
Question by:ccleebelt
LVL 21

Expert Comment

by:Dale Burrell
ID: 39710310
update table1 set
  column1 = case when column1 = 0 then null else column1 end
  , column2 = case when column2 = 0 then null else column2 end
LVL 24

Accepted Solution

chaau earned 500 total points
ID: 39710548
I would perhaps add a WHERE clause to restrict the number of scanned rows, like this:
update table1 set
  column1 = case when column1 = 0 then null else column1 end
  , column2 = case when column2 = 0 then null else column2 end 
WHERE column1 = 0 OR column2 = 0

Open in new window


Featured Post

Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
.htaccess file settings 4 32
Sql query for filter 12 21
Sql query to Stored Procedure 6 14
BULK INSERT most recent CSV 19 17
Nowadays, some of developer are too much worried about data. Who is using data, who is updating it etc. etc. Because, data is more costlier in term of money and information. So security of data is focusing concern in days. Lets' understand the Au…
JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
Via a live example, show how to extract insert data into a SQL Server database table using the Import/Export option and Bulk Insert.

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now