SQL Server and String Concatenation

Slava Murygin walks us through the rules around string concatenation with the + operator in SQL Server:

Pretty recently hit very interesting problem of how SQL Server concatenates strings.

The very same SELECT clause in some cases produced VARCHAR(MAX), but in same cases it cut the result to VARCHAR(8000) ( or NVARCHAR(4000) )

After a research I’ve discovered following:

Read on to see what Slava has discovered.

Related Posts

Isolation Levels and Dynamic SQL

Max Vernon points out how transaction isolation levels work when combined with sp_executesql: Imagine you have a piece of code where you don’t care about the downsides to the “read uncommitted” isolation level, and do your due diligence by adding SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; at the start of your code. The code following that statement […]

Read More

Reading SQL Server Error Logs

Thomas Rushton has a script for us: Why Script This? What’s Wrong With SSMS’s GUI?Well, although SSMS does allow you to look at the error logs, it’s not very helpful for filtering – you can only filter for items that match, rather than exclude items. There are a few other filters as well – I […]

Read More

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Categories

August 2019
MTWTFSS
« Jul  
 1234
567891011
12131415161718
19202122232425
262728293031