External Article

Showplan Operator of the Week – BookMark/Key Lookup

Fabiano continues in his mission to describe the major Showplan Operators used by SQL Server's Query Optimiser. This week he meets a star, the Key Lookup, a stalwart performer, but most famous for its role in ill-performing queries where an index does not 'cover' the data required to execute the query. If you understand why, and in what circumstances, key lookups are slow, it helps greatly with optimising query performance.

Blogs

Why Database AI Agents need Layers?

By

Third part in my Ai series with databases. When building AI solutions within the...

Un-Migrating From the Cloud: T-SQL Tuesday #199

By

This month we have a very interesting invitation from Koen Verbeeck. He has hosted...

T-SQL Tuesday #199: Back to the on-prem

By

It’s the second tuesday of the month, which means T-SQL Tuesday time! This month’s...

Read the latest Blogs

Forums

Unable to restrict permission

By LearningDBA

I have 13 restricted views in my EDW DB. 6 of them are created...

Install SQL Scripts via GUI Wizard

By Jörg

Hallo all! My problem is this: I have quite a bunch of TSQL scripts...

Would You Retire Rather Than ...

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Would You Retire Rather Than...

Visit the forum

Question of the Day

Converting Money

Does this run successfully on a SQL Server 2022, US English default installation?

DECLARE @YenAmount MONEY;
SET @YenAmount = ¥1500; 

SELECT @YenAmount AS RawValue;

See possible answers