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• SQL Server Add Primary Key

  - by Derek D.

  Adding a primary key can be done either after a table is created, or at the same a table is created. It is important to note, that by default a primary key is clustered. This may or may not be the preferred method of creation. For more information on clustered vs non [...]

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• SQL Server Cast

  - by Derek Dieter

  The SQL Server cast function is the easiest data type conversion function to be used compared to the CONVERT function. It takes only one parameter followed by the AS clause to convert a specified value. A quick example is the following:SELECT UserID_String = CAST(UserID AS varchar(50)) FROM dbo.UserThis example will convert the integer to a character value. [...]

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• Find Duplicate Fields in a Table

  - by Derek Dieter

  A common scenario when querying tables is the need to find duplicate fields within the same table. To do this is simple, it requires utilizing the GROUP BY clause and counting the number of recurrences. For example, lets take a customers table. Within the customers table, we want to find all the [...]

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• Dynamic Number Table

  - by Derek D.

  Using a numbers table is helpful for many things. Like finding gaps in a supposed sequence of primary keys, or generating date ranges or any numerical range. In some cases, you will be in a production system that does not already contain a numbers table and you will also be unable to add [...]

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• SQL Server Begin Try

  - by Derek Dieter

  The try catch methodology of programming is a great innovation for SQL 2005+. The first question you should ask yourself before using Try/Catch should be “why?”. Why am I going to use Try/Catch? Personally, I have found a few uses, however I must say I do fall into the category of not [...]

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• SQL Server Max SmallInt Value

  - by Derek Dieter

  The maximum value for a smallint in SQL Server is: -32768 through 32767 And the byte size is: 2 bytes other maximum values: BigInt: -9223372036854775808 through 9223372036854775807 (8 bytes) Int: -2147483648 through 2147483647 (4 bytes) TinyInt: 0 through 255 (1 byte) Related Posts:»SQL Server Max TinyInt Value»SQL Server Max Int Value»SQL Server Bigint Max Value»Dynamic Numbers Table»Troubleshooting SQL Server Slowness

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• SQL Server Max TinyInt Value

  - by Derek Dieter

  The maximum value for a tinyint in SQL Server is: 0 through 255 And the byte size is: 1 byte other maximum values: BigInt: -9223372036854775808 through 9223372036854775807 (8 bytes) Int: -2147483648 through 2147483647 (4 bytes) SmallInt: -32768 through 32767 (2 bytes) Related Posts:»SQL Server Max SmallInt Value»SQL Server Max Int Value»SQL Server Bigint Max Value»Create Date Table»Dynamic Numbers Table

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• Find Column in All Databases

  - by Derek Dieter

  Occasionally, there comes a requirement to search all databases on a particular server for either columns with a specific name, or columns relating to a specific subject. In the most recent case, I had to find all similar columns in all databases because the company plans to change the datatype of these columns. [...]

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• SELECT TOP 1

  - by Derek Dieter

  There are many good uses of the SELECT TOP 1 method of querying. Essentially, the select top 1 method is used to find the min or max record for a particular value. There is some debate as to whether this is the ‘correct’ method of querying, however it should be known that this [...]

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• String or binary data would be truncated.

  - by Derek Dieter

  This error message is relatively straight forward. The way it normally happens is when you are trying to insert data from a table that contains values that have larger data lengths than the table you are trying to insert into. An example of this would be trying to insert data from a permanent table, into [...]

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• Rownum in SQL Server

  - by Derek Dieter

  Prior to SQL Server 2005, there was no inherent function to generate a rownumber within a row. There is a workaround however for SQL 2000. If you are on SQL 2005+, then you will utilize the following function:-- SQL 2005+ SELECT RowNumber = ROW_NUMBER() OVER (ORDER BY c.CustomerID ASC) [...]

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• Generating a Dynamic Date Table to Find Missing Dates

  - by Derek D.

  Generating a date table on the fly is nice to have for many reasons. The most recent of my adventures required determining when employees did not enter their time in their timesheets. I know I had a tattle tale job, the ironic part is that I ended up getting in trouble the next [...]

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• Get Session ID

  - by Derek Dieter

  To get the session ID, simply use the intrinsic variable @@SPID:SELECT @@SPIDThe acronym for SPID means Server Process ID. It is synonymous with session. Related Posts:»SQL Server Kill»Using sp_who2»Blocking Processes (lead blocker)»A Better sp_who2 using DMVs (sp_who3)»Troubleshooting SQL Server Slowness»SQL Server 2008 Minimally Logged Inserts»Insert Results of Stored Procedure Into Table»SQL Server Slow Performance»View Active [...]

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• SQL Date Comparison

  - by Derek Dieter

  When comparing the datetime datatype in SQL Server, it is important to maintain consistency in order to gaurd against SQL interpreting a date differently than you intend. In at least one occasion I have seen someone specify a short format for a date, like (1/4/08) only to find that SQL interpreted the month as [...]

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• The EXECUTE permission was denied on the object

  - by Derek Dieter

  This error is pretty self explanatory. If you are here, I’m sure you simply want to know how to correct it, so here goes. The user context in which you are executing does not have the rights to execute the procedure or function. So first, in order to find out which user you are, [...]

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• Gracefully Handling Deadlocks

  - by Derek Dieter

  In some situations, deadlocks may need to be dealt with not by changing the source of the deadlock, but by changing handling the deadlock gracefully. An example of this may be an external subscription that runs on a schedule deadlocking with another process. If the subscription deadlocks then it would be ok to [...]

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• Alter Index All Tables

  - by Derek Dieter

  This script comes in handy when needing to alter all indexes in a database and rebuild them. This will only work on SQL Server 2005+. It utilizes the ALL keyword in the Alter index statement to rebuild all the indexes for a particular table. This script retrieves all base tables and stores [...]

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• Copy Table to Another Database

  - by Derek Dieter

  There are few methods of copying a table to another database, depending on your situation. Same SQL Server Instance If trying to copy a table to a database that is on the same instance of SQL Server, The easiest solution is to use a SELECT INTO while using the fully qualifed database names.SELECT * INTO Database2.dbo.TargetTable FROM Database1.dbo.SourceTableThis will [...]

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• Using Coalesce

  - by Derek Dieter

  The coalesce function is used to find the first non-null value. The function takes limitless number of parameters in order to evaluate the first non null. If all the parameters are null, then COALESCE will also return a NULL value.-- hard coded example SELECT MyValue = COALESCE(NULL, NULL, 'abc', 123)The example above returns back [...]

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• Is Job Running?

  - by Derek D.

  The following SQL Server script works to determine if a particular job is currently running. This feature is nice to have if you do not want jobs to step over one another. I frequently will use this script as the first step of the job. If it is currently running, then the [...]

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• SQL Server For Each Row Next

  - by Derek Dieter

  It is difficult for me to write this particular article and I’ll tell you why. If you don’t care then just skip down to the example, but here goes anyway. It is very rare that you should have to perform looping in SQL. There are certain situations that do require it, and [...]

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• SQL Insert Into Statement

  - by Derek Dieter

  The “insert into” statement is used in order to insert data into an existing table. The syntax for this is fairly simple. In the first section of the statement, you specify the table name and column names in which you are inserting data into. The second part is where the source of [...]

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• How to Optimize Stored Procedures

  - by Derek D.

  There are many factors to speeding up stored procedures. Knowing these in advance can save you and your company many hours of headaches. Using these practices when writing procedures, you can turn your SQL Server into a fine-tuned machine. This tutorial will cover the specifics to help you tune your procedures optimally. Know [...]

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• How to Truncate the Log File

  - by Derek Dieter

  Sometimes after one or more large transactions, the t-log (transaction log) will become full. In these particular cases you may receive an error message indicating the transaction log is full. In order to alleviate this issue, you need to find the names of the transaction logs on your system and then shrink them. To find the [...]

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• Gracefully Dealing with Deadlocks

  - by Derek Dieter

  In some situations, deadlocks may need to be dealt with not by changing the source of the deadlock, but by changing handling the deadlock gracefully. An example of this may be an external subscription that runs on a schedule deadlocking with another process. If the subscription deadlocks then it would be ok to [...]

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