SQL Server Tagged SQL Tutorials


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How to Calculate the Average of a Numerical Column SQL Server

Filed in: Queries, SQL Server

This tutorial will show how to calculate the average of a numerical column with the AVG function in SQL Server. The AVG function returns the average value of a numeric column […]

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How to Handle Null Values with the COALESCE Function in SQL Server

Filed in: Queries, SQL Server

This tutorial will show how to use the COALESCE function to handle null values at run time. The COALESCE() function is used to specify how we want to treat NULL […]

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How to Assign Column Aliases in SQL Server

This tutorial will show how to create a table and write a query that assigns aliases to the columns in the table. One of the benefits of using table expressions […]

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How to Count Distinct Values in a Table In SQL Server

Filed in: Queries, SQL Server

This tutorial will show how to create a query that retrieves a count of unique values in a column of a table. To make this query work, we will use […]

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How to Create and Use a Derived Table in SQL Server

This tutorial will show you how to create and use a derived table in SQL Server. Derived tables, also known as subqueries, are defined in the FROM clause of an […]

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How to Alter Tables and Modify Columns in SQL Server

In this tutorial we will show how to use the ALTER TABLE statement to modify columns in a table. We can either add, delete, or modify columns in an existing […]

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How to Check for Existing Rows in a Subquery in SQL Server

This tutorial will show you how to use the EXISTS predicate and check if a row does or doesn’t exist in a subquery. The EXISTS predicate accepts a subquery as […]

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How to Create a Self-Contained Multi-Valued Subquery in SQL Server

In this tutorial you will learn how to create a self-contained multi-valued subquery. You may be wondering, what exactly is a multi-valued subquery? It is a subquery that returns multiple […]

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How to Create a Self-Contained Scalar Subquery in SQL Server

In this tutorial you will learn what a self-contained scalar subquery is and how to create one. A scalar subquery is a subquery that returns a single value regardless if […]

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How to Outer Join Tables in SQL Server

Filed in: Joins, SQL Server

This tutorial will show you how to use the outer joins on tables. Outer joins make use of the JOIN keyword between the table names to let SQL Server know […]

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