Category Archives: T-SQL
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Error message: http://System.Data.SqlClient.SqlException (0x80131904): Conversion failed when converting the varchar value ‘NULL’ to data type int.
7December 5, 2019 by Kenneth Fisher
I love this error. Primarily because it demonstrates two very important things. Errors matter. Make sure when you ask someone …
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The curious case of CHAR(0)
10November 14, 2019 by Kenneth Fisher
Over the years I’ve seen quite a few strange things with SQL Server. This one may not have been the …
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SQL Homework – October 2019 – Code review (self and peer)
Leave a commentOctober 2, 2019 by Kenneth Fisher
Every database person I’ve ever met writes at least some code at some point in their career. That code might …
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When were the statistics last updated and how many rows were sampled?
Leave a commentSeptember 4, 2019 by Kenneth Fisher
TL;DR; Final query is at the bottom. Every now and again (particularly when someone is having performance problems) I’ll get …
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Setting Trigger Order
Leave a commentAugust 26, 2019 by Kenneth Fisher
If you can help it you probably shouldn’t be using triggers. But if you have to use a trigger you …
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Why do DBAs dislike loops?
5August 22, 2019 by Kenneth Fisher
If you started out as a developer you were probably taught how important loops are. They are one of the …
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Constructing a datetime from an integer date and an integer time.
4August 15, 2019 by Kenneth Fisher
Occasionally I’ve seen date and time stored separately as integers. This had some practical applications back before we had date …
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Temporary stored procedures
Leave a commentAugust 7, 2019 by Kenneth Fisher
tl;dr; Temporary stored procedures are excellent for testing pieces of code that are going to go into (or come from) …
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Optional vs Required parameters in Stored Procedures
7July 29, 2019 by Kenneth Fisher
If you are executing a stored procedure with a bunch of parameters it can be a bit of a pain …
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Custom error messages
1July 24, 2019 by Kenneth Fisher
I’m sure lots of you have used the function RAISERROR to handle an error caused by your code. The problem …
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