The final level of this stairway looks at the MERGE statement in detail, focusing on how to perform insert, update and delete logic using the MERGE statement.
2014-08-20 (first published: 2013-01-16)
20,033 reads
When you are writing TSQL code there are times when you want to perform the same logic over and over again. To accomplish this you can used the WHILE keyword. There are other times when you want to perform a conditional test and depending on the results of the test you execute one code block for the TRUE condition and possibly a different code block when the condition is FALSE. When you need to conditionally execute code based on the outcome of a condition you can used the IF keyword. In this Stairway level I will be discussing how to use the WHILE and IF constructs to control the flow of your TSQL code.
2014-06-25
8,559 reads
Unless you are working on a reporting-only application you will probably need to update tables in your SQL Server database. To update rows in a table you use the UPDATE statement. In this level we will be discussing how to find and update records in your database, and discuss the pitfalls you might run into when using the UPDATE statement.
2012-10-10
8,635 reads
You may have data in a database that was inserted into a table by mistake, or you may have data in your tables that is no longer of value. In either case, when you have unwanted data in a table you need a way to remove it. The DELETE statement can be used to eliminate data in a table that is no longer needed. In this article you will see the different ways to use the DELETE statement to identify and remove unwanted data from your SQL Server tables.
2012-09-19
11,570 reads
Not all applications are limited to only retrieving data from a database. Your application might need to insert, update or delete data as well. In this article, I will be discussing various ways to insert data into a table using an INSERT statement.
2012-09-05
9,561 reads
In this article I will be expanding on my discussion of the GROUP BY clause by exploring the ROLLUP, CUBE and GROUPING SETS operators. These additional GROUP BY operators make it is easy to have SQL Server create subtotals, grand totals, a superset of subtotals, as well as multiple aggregate groupings in a single SELECT statement.
2012-08-22
15,627 reads
In this article you will be see how to group data using the simple GROUP BY clause, in order to summarize more complex data.
2012-01-04
11,715 reads
In this Level you will see how to use the ORDER BY clause to return your data in a sorted order.
2011-12-14
11,492 reads
Let’s step back in time and discuss the history of Structured Query Language, or what most SQL Server professionals just shorten to SQL. Fasten your seatbelts, crank up the time machine and travel back in time to follow the history of SQL and Microsoft SQL Server from its early years to where they are today.
2011-10-21
12,042 reads
There are lots of different aspects of managing data in a SQL Server database. Before you can get into the complex management issues associated with managing application data you need to start with the basic of retrieving data from a table. To return data from a SQL Server table you use a SELECT statement. In this level I will be cover the components of the basic SELECT statement and how you can use it to retrieve data from a single SQL Server table.
2011-10-07
23,148 reads
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