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Category: T-SQL

Selecting Into Tables, Sans Identity

Kenneth Fisher shows a couple of ways to remove an identity property from a column when creating a new table:

A while back I did a post about creating an empty table using a SELECT statement. Basically doing something like this:

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SELECT TOP 0 * INTO tableNameArchive FROM tableName

will create a new table with the exact same structure as the source table. It can be a really handy way to create an archive table, a temp table, etc. You don’t create any of the extra objects (indexes, triggers, constraints etc) but what you do end up with is every table property from the original table. This includes datatypes, nullability, and (as I’m sure you realized from the title) IDENTITY. Which if you are creating an archive table, a temp table, etc is probably not something you want. Fortunately, there are two easy ways to get rid of the identity.

Click through to see those two methods.

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Building Temp Tables From Queries

David Fowler shows how to use dm_exec_describe_first_result_set to generate a temp table schema:

Have you ever needed to store the results of a complex query in a temp table?  How did you go about working out what the definition for that temp table should be, the columns and their data types?

It can be a bit of a pain, not to mention time consuming to have to go figuring out what all datatypes of the base tables are.

I got fed up with all that hunting around as well so as a quick blog I thought I’d share a little script that will take your query in a variable and print out a temp table definition for its result set.

Click through for the script, as well as an important comment by frequent curatee Shane O’Neill.

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The Pain Of Multi-Statement TVFs

Andy Mallon walks through a multi-statement table-valued function in Microsoft Dynamics CRM:

Look at all those table-valued function calls! Followed immediately by a really expensive hash match. My Spidey Sense started to tingle. What is fn_GetMaxPrivilegeDepthMask, and why is it being called 30 times? I bet this is a problem. When you see “Table-valued function” as an operator in a plan, that actually means it’s a multi-statement table-valued function. If it were an inline table-valued function, it would get incorporated into the larger plan, and not be a black box. Multi-statement table-valued functions are evil. Don’t use them. The Cardinality Estimator isn’t able to make accurate estimates. The Query Optimizer isn’t able to optimize them in the context of the larger query. From a performance perspective, they don’t scale.

Even though this TVF is an out-of-the-box piece of code from Dynamics CRM, my Spidey Sense tells me that it’s the problem.

That said, Joe Sack and team are working on making multi-statement TVFs faster in SQL Server 2017.  Whether it will move the needle from Andy’s excellent advice, we’ll have to wait and see.

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Your Reminder Not To MERGE

Kevin Wilkie points out the numerous problems with the MERGE operator:

Now, when I last posted, I’m sure you thought I was done talking about the MERGE statement. You are so wrong, compadre! One more post is absolutely needed!

There are a few issues with the MERGE statement. Well, as of this writing, there are 361 possible issues according to Microsoft Connect – the actual website where Microsoft checks to see what issues exist!

So, if you want to use the MERGE statement, please read through every issue listed on the link above and make sure that none of those scenarios could exist for you. If they don’t, great. Knock yourself out and use it.

But wait, there’s more!  Read on to see what else could be a problem.

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CROSS APPLY Replacing REPLACE

Bert Wagner shows off a good use of the APPLY operator:

Here we only have 4 nested REPLACE functions. My shameful record is 29. I’m not proud of it, but sometimes it’s the only way to get things done.

Not only are these nested REPLACE() functions difficult to write, but they are difficult to read too.

Instead of suffering through all of that ugly nesting, what you can do instead is use CROSS APPLY:

Click through for the example.  This is one of several great uses for the APPLY operator.

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Substrings: Powershell Versus T-SQL

Shane O’Neill contrasts the SUBSTRING function in T-SQL with Powershell’s Substring method:

The main difference that I can see when using SUBSTRING() in SQL Server versus in PowerShell is that SQL Server is very forgiving.

If you have a string that is 20 characters longs and you ask for everything from the 5th character to the 100th character, SQL Server is going to look at this, see that the string does not go to the 100th character, and just give you everything that it can.

It’s a small difference but an important one.

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Spheres In SQL Server

Slava Murygin continues his quest to build a graphics engine with spatial data:

Couple of years ago I came up with an algorithm of drawing an ellipse using SQL Server spatial geometry: http://slavasql.blogspot.com/2015/02/drawing-ellipse-in-ssms.html

I’ve used that algorithm to make a sphere and as in my previous blog of drawing 3D Cube I use external procedure to simplify the process.
This time instead of temporary stored procedure I’m using a function to generate Geometrical content.

This has been an enjoyable series so far, showing how to build different shapes using spatial queries.

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ARITHABORT And ANSI_WARNINGS

Shane O’Neill looks at what the ARITHABORT and ANSI_WARNINGS settings do in SQL Server:

So, like a dog when it sees a squirrel, when I found out about the problems with ARITHABORT and ANSI_WARNINGS I got distracted and started checking out what else I could break with it. Reading through the docs, because I found that it does help even if I have to force myself to do it sometimes, I found a little gem that I wanted to try and replicate. So here’s a reason why you should care about setting ARITHABORT and ANSI_WARNINGS on.

These are two settings where the default value makes a lot of sense.

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Conditional Counts

Mark Broadbent shows that COUNT has a few tricks up its sleeve:

When I came to compare the results against aggregated data that I had, I noticed that the values were off and it became fairly obvious that the transactional data also contained refunds and rebates (positive values but logically reflected as negative by the Transaction_Type status) and these were not just causing inaccuracies for the SUM on Sales_Value, but were also causing the COUNT for Number_Of_Sales to be wrong. In other words, refunds and rebates must be removed from the SUM total and not aggregated in the Number_Of_Sales columns. Now at this stage, you might be thinking that we can do this by a simple WHERE clause to filter them from the aggregates, but not only is it wrong to “throw away” data, I realised that my target tables also contained aggregate columns for refunds and rebates.

I have only used the SUM(CASE) method that Mark shows.  It’s interesting that COUNT(CASE) can work, but I agree that it is probably more confusing, if only because it’s so rare.

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