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Channel: Journey to SQL Authority with Pinal Dave » SQL Constraint and Keys
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SQL SERVER – 2008 – Interview Questions and Answers Complete List Download

SQL Server Interview Questions and Answers Print Book Available (207 Pages) | Sample Chapters Download SQL Server 2008 Interview Questions and Answers Complete List UPDATE: This article series has...

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SQL SERVER – Guidelines and Coding Standards Part – 1

Use “Pascal” notation for SQL server Objects Like Tables, Views, Stored Procedures. Also tables and views should have ending “s”. Example: UserDetails Emails If you have big subset of table group than...

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SQL SERVER – Guidelines and Coding Standards Complete List Download

SQL SERVER – Guidelines and Coding Standards complete List Download Coding standards and guidelines are very important for any developer on the path of successful career. A coding standard is a set of...

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SQL SERVER – Interesting Observation about Order of Resultset without ORDER BY

Today I observed very interesting little thing about SQL Server and I felt that I should share this with my readers. I ran following two queries and found that I am getting different result-set. When I...

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SQL SERVER – Observation – Effect of Clustered Index over Nonclustered Index

Today I came across very interesting observation while I was working on query optimization. Let us run the example first. Make sure to to enable Execution Plan (Using CTRL + M) before running...

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SQL SERVER – Introduction to Force Index Query Hints – Index Hint

This article, I will start with disclaimer instead of having it at the end of article. “SQL Server query optimizer selects the best execution plan for a query, it is recommended to use query hints by...

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SQL SERVER – Introduction to Force Index Query Hints – Index Hint – Part2

In my previous article SQL SERVER – Introduction to Force Index Query Hints – Index Hint I have discussed regarding how we can use Index Hints with any query. I just received email from one of my...

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SQL SERVER – Observation – Effect of Clustered Index over Nonclustered Index

Note: This article is re-write of my previous article SQL SERVER – Observation – Effect of Clustered Index over Nonclustered Index. I have received so many request that re-write it as it is little...

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SQL SERVER – 2008 – Find Relationship of Foreign Key and Primary Key using...

While searching for how to find Primary Key and Foreign Key relationship using T-SQL, I came across my own blog article written earlier SQL SERVER – 2005 – Find Tables With Foreign Key Constraint in...

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SQL SERVER – How to Drop Primary Key Contraint

One area that always, unfailingly pulls my interest is SQL Server Errors and their solution. I enjoy the challenging task of passing through the maze of error to find a way out with a perfect solution....

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SQL SERVER – Difference Between Candidate Keys and Primary Key

Let us first try to grasp the definition of the two keys. Candidate Key – A Candidate Key can be any column or a combination of columns that can qualify as unique key in database. There can be multiple...

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SQL SERVER – Clustered Index on Separate Drive From Table Location

How to improve performance of SQL Server Queries is a common topic of discussion among many of us. Much has been said, much has been discussed. Few days back, I had an interesting discussion with one...

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SQL SERVER – Two Methods to Retrieve List of Primary Keys and Foreign Keys of...

There are two different methods of retrieving the list of Primary Keys and Foreign Keys from database. Method 1: INFORMATION_SCHEMA SELECT DISTINCT Constraint_Name AS [Constraint], Table_Schema AS...

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SQL SERVER – Puzzle – Write Script to Generate Primary Key and Foreign Key

In one of my recent projects, a large database migration project, I confronted a peculiar situation. SQL Server tables were already moved from Database_Old to Database_New. However, all the Primary Key...

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SQL SERVER – Discussion – Effect of Missing Identity on System – Real World...

About a week ago, SQL Server Expert, Imran Mohammed, provided a script, which will list all the missing identity values of a table in a database. In this post, I asked my readers if any could write a...

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SQL SERVER – Difference Between Candidate Keys and Primary Key

Introduction Not long ago, I had an interesting and extended debate with one of my friends regarding which column should be primary key in a table. The debate instigated an in-depth discussion about...

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SQL SERVER – Disable CHECK Constraint – Enable CHECK Constraint

Foreign Key and Check Constraints are two types of constraints that can be disabled or enabled when required. This type of operation is needed when bulk loading operations are required or when there is...

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SQL SERVER – A Common Design Problem – Should the Primary Key Always be a...

In SQL Server, whenever we create any key, a Primary Key automatically creates clustered index on the same. I like this feature and I use this feature every now and then. The question is does the...

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SQL SERVER – Create Primary Key with Specific Name when Creating Table

It is interesting how sometimes the documentation of simple concepts is not available online. I had received email from one of the reader where he has asked how to create Primary key with a specific...

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SQL SERVER – GUID vs INT – Your Opinion

I think the title is clear what I am going to write in your post. This is age old problem and I want to compile the list stating advantages and disadvantages of using GUID and INT as a Primary Key or...

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