T-SQL

A Little Fun With Math

I’ve never been much at math But I’ve always liked reading about it. It’s super interesting, and it always blows my mind. Like, guaranteed. Once in a while I’ll even try my hand at solving problems I read about in SQL. Not because SQL is a particularly good language for it; but just because sometimes…
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Tara Kizer

What TRY/CATCH Doesn’t Handle

We were once asked in class what TRY/CATCH doesn’t handle besides object existence errors. It’s well documented in Books Online (BOL). If you’re like me, then tl;dr. Are we even calling it Books Online these days? I still say “bookmark lookup” instead of “key lookup”. I suppose I’ll be saying Books Online for quite some…
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Give Your T-SQL a Semicolonoscopy

In theory, all of your T-SQL statements are supposed to end with a semicolon, like this: Transact-SQL SELECT * FROM dbo.Posts; SELECT * FROM dbo.Comments; GO 123 SELECT * FROM dbo.Posts;SELECT * FROM dbo.Comments;GO Why? Well, SQL Server 2005’s Books Online says: Many code examples use a semicolon (;) as a Transact-SQL statement terminator. Although the…
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Indexing for Windowing Functions

Hooray Windowing Functions They do stuff that used to be hard to do, or took weird self-joins or correlated sub-queries with triangular joins to accomplish. That’s when there’s a standalone inequality predicate, usually for getting a running total. With Windowing Functions, a lot of the code complexity and inefficiency is taken out of the picture,…
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How to Cache Stored Procedure Results

Say you run an online store, and on each item’s page, you need to show related items that people purchased. Let’s take an Amazon page for my favorite rechargeable AA batteries: Frequently Bought Together In a perfect world, we would cache this data in the web/app tier – but back here in the real world,…
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Query Execution Plan

Sargability: Why %string% Is Slow

People love to search. Google has us addicted to fast, easy search functions.  Users expect every application to have a built-in blazing-fast search functionality.  To pull that off, developers build search queries that let users enter a string, and we ask SQL Server to find matches.  For example, say our users need to find some…
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