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SQL SERVER – What Does WHERE 1=1 Mean in the Code?

October 1, 2015
Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
One of the blog followers asked this question “The code written by my colleague has WHERE 1=1. What does it mean?” Well. You have seen people using it when they dynamically construct WHERE condition based on the input values. Let us create this dataset CREATE TABLE #t (emp_name VARCHAR(100), experience…
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SQL SERVER – What is Windows Internal Database Edition?

September 30, 2015
Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
The more you read the more you learn. But some of the best learnings need not come from known sources. These can be accidental too. These learnings in my opinion involves tons of exploration which you would have never done before. This blog post today is something on the similar…
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SQL SERVER – Fix: SQL Server CPU Schedulers Offline

September 29, 2015
Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
SQL CPU
Performance troubleshooting are some of the most common things I get to see as part this blog. A number of you keep sending me interesting mails that keep me up-to-date on my learnings. Yes, it is tough to know everything, but at the same time, it is almost impossible to…
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SQL SERVER – Basic architecture of Transaction Logs

September 28, 2015
Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
SQL Log
Readers bump into this blog because it tries to simplify some of the most complex topics into a digestible format. I am a strong believer of this and try to bring some of these topics from time-to-time. Even I find some of these topics confusing, if I can understand them…
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Interview Question of the Week #038 – What is Left Semi Join Showplan Operator?

September 27, 2015
Pinal Dave
SQL, SQL Interview Questions and Answers, SQL Server, SQL Tips and Tricks
SQL Joins
It is very common of interviewers to ask questions which are a bit off and sometimes not used in daily life.  Here is such question I heard the other dya. Question: What is Left Semi Join Showplan Operator? Answer:  There are few interesting kinds of joint operations exists when execution…
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SQL SERVER – How to Restore Corrupted Model Database from Backup?

September 26, 2015
Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
SQL Error Messages
Another email from one of my blog reader, which made me think about the incorrect information which is available on the internet. Hi Pinal, I have corruption in model database and due to that SQL Service is not able to start. Here are the messages in SQL ERRORLOG 2015-09-23 21:45:07.00…
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SQL SERVER – Failed Rule “Valid DSN” and “Valid Database compatibility level and successful connection”

September 25, 2015
Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
SQL Error Messages
I always try to keep myself up-to-date with latest release of SQL Server. As a part of that I wanted to upgrade my SQL Server 2016 CTP2.2 to CTP2.3 version. While doing in-place upgrade I was blocked with few error and I was not able to proceed. Here is the…
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