Yet another bunch of SQL string functions
January 13, 2020This article is a supplement to the previously published article, An overview of SQL String Functions . This time, we will describe another bunch of SQL string functions used in SQL Server.
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Learn SQL: SELECT statement
January 13, 2020The SELECT statement is probably the most important SQL command. It’s used to return results from our database(s) and no matter how easy that could sound, it could be really very complex. In this article, we’ll give an intro to the SELECT statement and we’ll cover more complex stuff in the upcoming articles.
Linking relational databases with OLAP cubes
January 10, 2020One of the most asked questions is how to link an OLAP cube with a relational database, or in another way how to join the result of an MDX query with a table stored in a relational database.
Using SQL CREATE INDEX to create clustered and non-clustered indexes
January 10, 2020The SQL CREATE INDEX statement is used to create clustered as well as non-clustered indexes in SQL Server. An index in a database is very similar to an index in a book. A book index may have a list of topics discussed in a book in alphabetical order. Therefore, if you want to search for […]
An overview of sp_getapplock and sp_releaseapplock stored procedures
January 9, 2020This article explains about the sp_getapplock and sp_releaselock stored procedures and their usage with example.
SQL Unit Testing Data Warehouse Extracts with tSQLt
January 7, 2020This article talks about basic concepts of SQL unit testing from a Data Warehouse point of view using tSQLt, a highly productive and acclaimed SQL unit testing framework.
Learn SQL: Foreign Key
January 7, 2020In the previous article, we talked about the primary key (PK). In this one, we’ll check what is the foreign key (FK) and how it’s related to the primary key. This is the final step, after creating tables, inserting data, and defining primary keys, to cover all basics related to the database theory. There is […]
An overview of the STRING_AGG function in SQL
January 3, 2020In this article, we will explore the STRING_AGG function in SQL and we will also reinforce our learning with various examples. STRING_AGG function can be counted as a new member of the SQL aggregation functions and it was announced in SQL Server 2017. STRING_AGG function gathers all expression from rows and then puts it together […]
How to fix the “Agent XPs disabled” error
December 27, 2019This article explains how we can fix SQL Server error “Agent XPs Disabled”. Before we dive into troubleshooting and methods for fixing the error, let me explain about Microsoft SQL Server Agent and the Agent XPs configuration parameter.
Rollback SQL: Rolling back transactions via the ROLLBACK SQL query
December 26, 2019The rollback SQL statement is used to manually rollback transactions in MS SQL Server.
Use Python SQL scripts in SQL Notebooks of Azure Data Studio
December 25, 2019This article explores the Python SQL scripts in SQL Notebook of Azure Data Studio.
SQL Injection: Introduction and prevention methods in SQL Server
December 25, 2019A SQL injection attack is one of the most commonly used hacking techniques. It allows hacks to access information from a database that is otherwise not publically accessible.
Using sp_executesql stored procedure for executing dynamic SQL queries
December 24, 2019The sp_executesql stored procedure is used to execute dynamic SQL queries in SQL Server. A dynamic SQL query is a query in string format. There are several scenarios where you have an SQL query in the form of a string.
Understanding the SQL EXCEPT statement with examples
December 23, 2019The SQL EXCEPT statement is one of the most commonly used statements to filter records when two SELECT statements are being used to select records. The SQL EXCEPT statement returns those records from the left SELECT query, that are not present in the results returned by the SELECT query on the right side of the […]
Overview of SQL Server Clustered indexes
December 23, 2019This article targets the beginners and gives an introduction of the clustered index in SQL Server.
Learn SQL: Primary Key
December 20, 2019If you’ve already worked with databases, then you could hardly miss the term – Primary Key (PK). And if you’re reading this series and use it to learn about databases, well, this article should give you a good overview of what the PK really is. Still, if you’re a database expert, maybe you’ll find something […]
Replace a SQL While loop and a cursor with ranking functions in SQL Server for better query performance
December 19, 2019SQL While loop and cursor are the most common approach to repeat a statement on condition-based or determined limits. Loop and cursor can be utilized in a circumstance to deal with row-based processing in T-SQL. We generally observe moderate execution of old made procedures, which are composed of using loop and cursors. Those procedures take […]
Send an alert when the database state changes to SQL Server single-user mode
December 18, 2019This article explains the SQL Server single-user mode and how to configure an automated email alert when the state of the user database changes to the single-user mode. To send an alert, we will create a DDL trigger that executes when the user runs the ALTER DATABASE query. It collects the pieces of information using […]
An overview of native differential backups in AWS RDS SQL Server
December 9, 2019This article explores the differential backups in AWS RDS SQL Server using recovery scenarios.
An overview of the SQL Server Update Join
December 5, 2019This article explores the SQL Server Update Join statement in T-SQL for SQL Server.
Learn SQL: CREATE DATABASE & CREATE TABLE Operations
December 5, 2019Welcome to the first article in the Learn SQL series. In this part, we’ll start with two essential commands in SQL: Create Database and Create Table. While both are pretty simple, they should be used first before you start working on anything with data (unless you use some template database).
Forwarded Records Performance issue in SQL Server
December 5, 2019This article discusses the Forwarded Records and its performance issues for heap tables in SQL Server.
Audit and Alert SQL Server Jobs Status Changes (Enabled or Disabled)
December 4, 2019In this article, we will talk about how to track enabled or disabled SQL jobs in SQL Server using T-SQL. Users with the Sysadmin role have the default permissions to modify the information of any jobs in SQL Server. If a user is not in this role and wants access to this activity, then the […]
The Table Variable in SQL Server
December 3, 2019In this article, we will explore the table variable in SQL Server with various examples and we will also discuss some useful tips about the table variables.
An overview of SSIS Pivot and SSIS Unpivot Transformations
November 28, 2019This article explores an SSIS Pivot transformation and SSIS Unpivot transformation for creating Pivot and Unpivot data tables.