Gregory Larsen

Stairway to T-SQL Beyond The Basics

Stairway to T-SQL: Beyond The Basics Level 6: Using the CASE Expression and IIF Function

There are times where you need to write a single T-SQL statement that is able to return different T-SQL expressions based on the evaluation of another expression. When you need this kind of functionality you can use the CASE expression or IIF function to meet this requirement. In this Stairway level Gregory Larsen reviews the CASE and IIF syntax and showing you examples of how the CASE expression and IIF function.

2016-04-20 (first published: )

16,530 reads

Stairway to T-SQL Beyond The Basics

Stairway to T-SQL: Beyond The Basics Level 5: Storing Data in Temporary Tables

There are times when retrieving data for complex business requirement requires you to temporarily store one or more results sets for a short period of time. Typically these temporary tables are stored in the scope of the current connection, but they may also need to be available across multiple connections.

2016-03-18 (first published: )

14,111 reads

Stairway to Advanced T-SQL

Stairway to Advanced T-SQL Level 9: Compare, Modify, Derive and Validate Date and Time Values

When you build applications that store data in SQL Server you will most likely have to store dates and times, and you’ll call functions to do date manipulations. It is important to understand the different date and time data types, and when to use one data type over another. In this level I will be exploring the different date and time data types and discussing when each type is appropriate.

2015-11-25

7,009 reads

Stairway to Advanced T-SQL

Stairway to Advanced T-SQL Level 6: Creating Rows Of Data Using The UNPIVOT Operator

The UNPIVOT operator does just the opposite of the PIVOT operator, which we looked at in the previous level. By using the PIVOT operator we can take multiple rows of data and create as single row as output. The UNPIVOT operator will take values from a single row and will create multiple rows. Microsoft introduced the UNPIVOT operator when they rolled out SQL Server 2005. In this level I will be showing you different examples of how to use the UNPIVOT operator.

2015-06-24

6,740 reads

Stairway to Advanced T-SQL

Stairway to Advanced T-SQL Level 5: Turning Data On Its Side Using PIVOT Operator

The PIVOT operator was added to the Transact-SQL language in SQL Server 2005. It allows you to turn your row data on its side, so it can be presented as column data. This is useful when you want take unique column values and have them displayed as column headings, where the column headings are associated with summarized values displayed below each column heading. In this article I will be exploring how to use the PIVOT operator.

4 (2)

2015-05-27

16,355 reads

Stairway to Advanced T-SQL

Stairway to Advanced T-SQL Level 4: Record Level Processing Using Transact-SQL Cursors

Using a CURSOR is not normally the best way to process through a set of records. Yet when a seasoned programmer moves to writing TSQL for the first time they frequently look for ways to process a sets of records one row at a time. They do this because they are not used to thinking about processing records as a set. In order to process through a TSQL record set a row at a time you can use a cursor. A cursor is a record set that is defined with the DECLARE CURSOR statement. Cursors can be defined as either read-only or updatable. In this article I will introduce you to using cursors to do record level processing one row at a time.

2015-05-06

7,065 reads

Stairway to Advanced T-SQL

Stairway to Advanced T-SQL Level 2: Using the APPLY Operator

The APPLY operator allows you to join a record set with a function, and apply the function to every qualifying row of the table (or view). The APPLY operator takes on two formats: CROSS APPLY, or OUTER APPLY. This article will explain the differences between these two formats, and show you examples of how each of these formats work.

2015-01-28

19,393 reads

Blogs

Graph – Shortest Path

By

‘Shortest path’ is by far the most feature of SQL Graph for now. What...

Last Week Reading (2019-09-22)

By

Hello #datafolks! Let’s review what happened last week in Data World. It’s hard to...

Simple Graph Queries

By

In this post we saw how to create some graph tables with data. In...

Read the latest Blogs

Forums

Is Data the Future of the Vibrant Web?

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Is Data the Future of...

memory not getting released to OS

By vsamantha35

Hi All, Need help here. Why is sql server is not releasing memory to...

Will the principal wait for acknowledgement from mirror?

By coolchaitu

Good Morning Experts, A transaction was sent to mirror database and immediately failover occured....

Visit the forum

Ask SSC

SQL Server Q&A from the SQLServerCentral community

Get answers