2015-11-03
1,786 reads
Nolock
2015-11-02
1,999 reads
Avoid using NOLOCK on SQL Server UPDATE and DELETE statements
Occasionally I come across UPDATE and DELETE statements where the target SQL Server table is referenced with the NOLOCK hint. Does this hint help or hurt performance in this case?
2014-03-03
4,698 reads
Understanding the SQL Server NOLOCK hint
It seems that in some SQL Server shops the use of the NOLOCK (aka READUNCOMMITED) hint is used throughout the application. In this tip we take a closer look at how this works and what the issues maybe when using NOLOCK.
2011-08-24
6,556 reads
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Question of the Day
The Funny SELECTs
What is returned from this query?
SELECT
( SELECT COUNT (*) FROM Sales.SalesOrderHeader AS soh
WHERE soh.OrderDate >= '01/01/2011' AND soh.OrderDate < '01/01/2012') AS OrdersIn2011
, ( SELECT COUNT (*) FROM Sales.SalesOrderHeader AS soh
WHERE soh.OrderDate >= '01/01/2012' AND soh.OrderDate < '01/01/2013') AS OrdersIn2012
, ( SELECT COUNT (*) FROM Sales.SalesOrderHeader AS soh
WHERE soh.OrderDate >= '01/01/2013' AND soh.OrderDate < '01/01/2014') AS OrdersIn2013; See possible answers