Rajendra Gupta

Rajendra Gupta
difference between RANK() and DENSE_RANK() functions

Overview of SQL RANK functions

July 3, 2019 by

We perform calculations on data using various aggregated functions such as Max, Min, and AVG. We get a single output row using these functions. SQL Sever provides SQL RANK functions to specify rank for individual fields as per the categorizations. It returns an aggregated value for each participating row. SQL RANK functions also knows as Window Functions.

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Overview of SQL Server Rounding Functions – SQL Round, Ceiling and Floor

June 26, 2019 by

Developers deal with numerous data types on a day- to-day basis. We need to change the data type or format as per the user requirement. We use ‘SQL Server rounding function’ like SQL Round, Ceiling and Floor to round the values to the nearest numbers. We perform an arithmetic calculation on data as well. It is a challenging task to change the value of a number to an approximate number. We do not want to display decimal numbers in the application front end.

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Get-DbaTable DBATools command

Script SQL Server objects using DBATools

June 20, 2019 by

This article gives an overview to generate scripts for SQL Server objects with Windows PowerShell tool DBATools.

Database administrators or developers require generating scripts for SQL Server objects. We might need scripts to store a copy of object script before object change, create specific objects into other database environments such as development, UAT or non-prod environment. It is an excellent practice to keep a copy of the object before making a change to it. We can easily refer to the old script and roll back if required. Usually, we use SSMS Generate Scripts wizard to get these scripts.

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insert sample data

SQL Between Operator overview and examples

June 11, 2019 by

We extract data from SQL Server tables along with various conditions. Usually, we have data in large amounts and SQL Between operator helps to extract a specific range of data from this huge data. For example, suppose we want to know the product sales between Jan 2019 to May 2019. In this case, we can use this operator in a SQL query.

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Execution plan and statistics

SQL Server Statistics in Always On Availability Groups

May 27, 2019 by

Introduction to SQL Server Statistics

SQL Server Statistics are an essential part of query performance in SQL Server. They help the query optimizer to prepare a query plan using the distribution of values in participating rows. If we do not have updated statistics, it might lead to resource intensive query execution plan. For example, for a large table having a billion records, SQL may choose to have an index scan instead of an index seek.

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sql server always on

SQL Server Always On Availability Group Data Resynchronization

May 9, 2019 by

In my previous article Data Synchronization in SQL Server Always On Availability Group, we described a scenario where if a secondary replica goes down in synchronous data commit mode, SQL Server Always on Availability group changes to asynchronous data commit mode. It ensures that users can get their transaction commit irrespective of waiting for a secondary replica to come online.

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