SQL SERVER – Cursor to Kill All Process in Database
I indeed wrote this cursor and when I often look back, I wonder how naive I was to write this. The reason for writing this cursor was to free up my database from any existing connection so I can do database operation. This worked fine but there can be a potentially big issue if there was any important transaction was killed by this process. There is another way to to achieve the same thing where we can use ALTER syntax to take database in single user mode. Read more about that over here and here.
Rules of Third Normal Form and Normalization Advantage – 3NF
The rules of 3NF are mentioned here
- Make a separate table for each set of related attributes, and give each table a primary key.
- If an attribute depends on only part of a multi-valued key, remove it to a separate table
- If attributes do not contribute to a description of the key, remove them to a separate table.
Correct Syntax for Stored Procedure SP
Sometime a simple question is the most important question. I often see in industry incorrectly written Stored Procedure. Few writes code after the most outer BEGIN…END and few writes code after the GO Statement. In this brief blog post, I have attempted to explain the same.
Switch Between Result Pan and Query Pan – SQL Shortcut
Many times when I am writing query I have to scroll the result displayed in the result set. Most of the developer uses the mouse to switch between and Query Pane and Result Pane. There are few developers who are crazy about Keyboard shortcuts. F6 is the keyword which can be used to switch between query pane and tabs of the result pane.
Interesting Observation – Use of Index and Execution Plan
Query Optimization is a complex game and it has its own rules. From the example in the article we have discovered that Query Optimizer does not use clustered index to retrieve data, sometime non clustered index provides optimal performance for retrieving Primary Key. When all the rows and columns are selected Primary Key should be used to select data as it provides optimal performance.
Interesting Observation – TOP 100 PERCENT and ORDER BY
If you pull up any application or system where there are more than 100 SQL Server Views are created – I am very confident that at one or two places you will notice the scenario wherein View the ORDER BY clause is used with TOP 100 PERCENT. SQL Server 2008 VIEW with ORDER BY clause does not throw an error; moreover, it does not acknowledge the presence of it as well. In this article we have taken three perfect examples and demonstrated which clause we should use when.
Comma Separated Values (CSV) from Table Column
A Very common question – How to create comma separated values from a table in the database? The answer is also very common if we use XML. Check out this article for quick learning on the same subject.
Azure Start Guide – Step by Step Installation Guide
Though Azure portal has changed a quite bit since I wrote this article, the concept used in this article are not old. They are still valid and many of the functions are still working as mentioned in the article. I believe this one article will put you on the track to use Azure!
Size of Index Table for Each Index – Solution
Earlier I have posted a small question on this blog and requested help from readers to participate here and provide a solution. The puzzle was to write a query that will return the size for each index that is on any particular table. We need a query that will return an additional column in the above listed query and it should contain the size of the index. This article presents two of the best solutions from the puzzle.
Well, this week in 2010 was the week of puzzles as I posted three interesting puzzles. Till today I am noticing pretty good interesting in the puzzles. They are tricky but for sure brings a great value if you are a database developer for a long time. I suggest you go over this puzzles and their answers. Did you really know all of the answers? I am confident that reading following three blog post will for sure help you enhance the experience with T-SQL.
- SQL SERVER – Challenge – Puzzle – Usage of FAST Hint
- SQL SERVER – Puzzle – Challenge – Error While Converting Money to Decimal
- SQL SERVER – Challenge – Puzzle – Why does RIGHT JOIN Exists
DVM sys.dm_os_sys_info Column Name Changed in SQL Server 2012
Have you ever faced a situation where something does not work? When you try to fix it ‑ you enjoy fixing it and started to appreciate the breaking changes. Well, this was exactly I felt yesterday. Before I begin my story, I want to candidly state that I do not encourage anybody to use * in the SELECT statement. Now the disclaimer is over – I suggest you read the original story – you will love it!
Here is the question to you – why would you do something in SQL Server where you can do the same task in command prompt much easily. Well, the answer is sometime there are real use cases when we have to do such thing. This is a similar example where I have demonstrated how in SQL Server 2012 we can use extended stored procedure to retrieve directory structure.
Reference: Pinal Dave (https://blog.sqlauthority.com)