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Convert Int to String
There are two different functions that can be used when converting an integer to a string. One is CAST and the other is CONVERT. Either of these functions can be used with the exact same result when...
View ArticleCTE’s vs Temp tables – an Opinion
This is one of those topics that will get people fired up. But here goes. I am mostly an explicit temp table developer. By contrast, I am not an implicit temp table developer. What I mean by that is –...
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Top 3 SQL Errors That Will Leave Your Users Stranded
Over the years I’ve ran across certain situations that cause errors in SQL that error out the calling application if they are not correctly trapped. As unsuspecting as these can be, you end up learning...
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Comparing EXISTS vs LEFT JOIN WHERE NOT NULL
Two of the most common ways to check for the existence of records is to use a WHERE EXISTS or to perform a LEFT JOIN WHERE values are NOT NULL. My personal choice is usually to use the EXISTS method...
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Yet Another Temp Tables Vs Table Variables Article
The debate whether to use temp tables or table variables is an old debate that goes back since they were first introduced. The real answer to knowing the difference lies in what is going on under the...
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The Difference Between UNION and UNION ALL
If you’re like me, after using UNION for many years you may have stumbled upon the UNION ALL and thought, what the heck is the difference? Well it’s pretty simple. UNION gives you the unique results...
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Using WITH (NOLOCK)
The WITH (nolock) hint is an explicit command directed at a specific table or view used to set the transaction isolation level against the table or tables within a view for a specific query. Once...
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How to order numeric values in a varchar field
If you have ever tried to order numerical values in a varchar field you’ll know that the sort doesn’t occur numerically as it would if the datatype were numeric. In other words, the values of 1 and 10...
View ArticleFormat String to Date
Changing the datatype of a string that represents a date to an actual date datatype is relatively easy using the CAST function. As long as the date string is in a format recognizable to the regional...
View ArticleDelete Using INNER JOIN
The need to join tables in order to determine which records to delete is a common requirement. The syntax can be somewhat tricky because you need to use an alias for the table you want to delete from....
View ArticleMatch identity columns after INSERT
One common requirement in SQL when inserting data between tables is to match the new identity column with the old identity column. The most common solution to this problem is to perform a cursor and do...
View ArticleUsing the OUTPUT Clause in SQL Server
The OUTPUT clause in SQL Server 2008 was probably one of the most functional T-SQL enhancements added. I personally don’t use it enough because I often forget about it, however I have used it to...
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User Defined Functions and Performance
There is definitely a lack of awareness in the SQL world regarding the use of user defined functions and the potential performance hit they can have when using within your queries. Don’t get me wrong,...
View ArticleSubstring Between Two Characters
Though SQL may not be the most elegant language for string handling, it does perform most functions and in a set based manner. The SQL substring function basically has the same syntax as found in other...
View ArticleSelecting Top N Records per Group
When you have multiple rows for let’s say a productID, there will probably be times when you need to select the top n subset of each those productid’s based upon a sort criteria. This is a relatively...
View ArticleDrop Table if Exists
To determine if a table exists, it’s best to go against the sys.objects view by querying the object_id using the fully qualified name of the table. The additional ‘type’ field in the where clause...
View ArticleMulti Row Insert
Performing a multi-row insert got easier in SQL 2008. A new syntax was added to accomodate multiple rows when using the VALUES statement. This code will only work in 2008+. In order to accomplish the...
View ArticleUsing WHERE EXISTS
As you may know, the WHERE EXISTS clause is used to constrain records from an outer query with records from an inner query. What does that mean? It’s just another way to say “it limits the result set”....
View ArticleFormat String to Date
Changing the datatype of a string that represents a date to an actual date datatype is relatively easy using the CAST function. As long as the date string is in a format recognizable to the regional...
View ArticleDelete Using INNER JOIN
The need to join tables in order to determine which records to delete is a common requirement. The syntax can be somewhat tricky because you need to use an alias for the table you want to delete from....
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