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It makes the entity name easy to understand and memorize, since the description closely matches the entity.
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Just compare the names in the following table:
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@@CurrentDate @@ActivityCount @@EquipmentType CalculateOrderTotal
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NOTE: Such descriptions are usually just the basis for a name. Standards generally prescribe the use of different prefixes or suffixes to further describe other attributes such as the type of object, the datatype of a variable, and the scope.
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A very common mistake is to use computer-oriented instead of business-oriented terminology. For example, ProcessRecord is a confusing name for a procedure. It should be replaced with a business description of the process such as CompleteOrder.
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Unfortunately, if you are too literal in naming procedures according to their business descriptions, you end up with names like
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w s v
PickupReconciliationInventoryIdentifier TotalAmountOfMonthlyPayments GetParentOrganizationalUnitName
Although SQL Server supports the use of identifiers up to 128 characters long, research has shown that code in which most variable names have a length between 8 and 15 characters is easiest to develop, read, debug, and maintain. This fact does not imply that all of your variables must have lengths in that range, but you can use it as a rule of thumb.
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Another rule of thumb is that you should try to limit names to three (3) words. Otherwise, names become too long, and thus too difficult to use and maintain. You could go to an extreme in the other direction as well. If you are using a variable as a temporary counter in a loop, you could name it @I. But even in that case, it might be easier to understand your code if you name it @OrderItem.
Abbreviations
A simple way to reduce the length of a name is to abbreviate it. If you can find an abbreviation in a thesaurus or dictionary, you should use it. You will avoid potential confusion. If not, you can simply remove vowels (except at the beginning of the word) and duplicate letters from each word, as in these examples:
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Current Crnt Address Adr Error Err Average Avg
You could also use the first letters of words or first few letters of a word, but make sure that the names you create will not be confused with other more common abbreviations. For example, you could abbreviate Complete Order Management to COM, but Visual Basic programmers might assume it stands for component. If you do not want to confuse readers of your code (such as the fellow programmers trying to maintain it months after you have moved to California to join an Internet start-up), you should avoid using phonetic abbreviations like
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4tran (Fortran) xqt (execute) b4 (before)
Abbreviations are great, but you should be careful not to confuse your colleagues. Try to be consistent. If you start abbreviating one
SQL Server 2000 Stored Procedure Programming
word, you should do the same in all occurrences (variables, procedures, objects). It is potentially confusing to abbreviate the word Equipment as Eq in one case and leave the full word in another case. You will cause confusion as to which to use and whether they are equivalent. To avoid confusion, you can write a description (using full words) in comments beside the declaration of a variable, in the definition of an object, or in the header of a procedure, for example
declare @ErrCd int -- Error Code
Name Formatting
I have seen people have endless debates about formatting identifiers. To underscore or not to underscore that is the question:
LeaseScheduleId lease_schedule_id
The truth is: it does not matter. You should avoid mixing these two conventions, because developers will never know what they have used for which variable. Unfortunately, you can catch even Microsoft developers mixing them. They are just human beings, after all. In some rare cases, I believe it is justifiable to mix these two conventions in one identifier. For example, I like to note modification statements at the end of the name of a trigger (insert and update trigger on OrderItem table):
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