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DISTINCT vs GROUP BY Performance in SQL Query

T SQL Date format convert function

If you ever wonder which one is really faster in Distinct vs Group By Performance Test then I will show some facts in this post so you can write your query accordingly.   To test distinct vs group by performance in SQL Query

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Posted in SQL Server, T-SQL Tips

How to overwrite SQL Server Backup rather than Append Mediaset

T SQL Date format convert function

In this post I will show you how to overwrite sql server backup file rather than append (default action is append to backup media set) If you try below t-sql command to take full sql server database backup then you

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Posted in DBA, SQL Server, T-SQL Tips

SQL Server parent child query example using recursive CTE (Common Table Expression)

How to get parent child relationship using recursive CTE query

Many times we have to write recursive parent child query (Multiple levels of Parent-Child Links)  in SQL Server. There are multiple approaches to achieve this Using Hierarchy ID builtin CLR datatype in SQL Server 2008 or higher (not ion sql server

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Posted in SQL Server, T-SQL Tips

SQL Date format using T-SQL CONVERT function (More than 40 formats)

T SQL Date format convert function

 How many time you had to t sql date format date specific way such as yyyymmdd ??   Many people don’t know hidden feature of builtin T-SQL CONVERT function . This function can not only convert data types but also change format of  dates/numbers.

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Posted in SQL Server, T-SQL Tips