What is SQL Server's master..spt_values Table and How Can It Be Used?
Understanding the System Table master..spt_values
The system table master..spt_values, inherited from Sybase, is a hidden gem in the SQL Server landscape that often sparks curiosity among developers. This article delves into its purpose, usage, and the meaning of its values.
Purpose and Use of master..spt_values
Despite its undocumented nature, master..spt_values plays a crucial role in SQL Server's operation. It is primarily used to translate internal system values into human-readable strings. For example, it can convert status codes into their corresponding descriptions or provide localized values based on a user's language settings.
Meaning of Values
The table consists of three columns:
- Type: Identifies the type of value being stored, such as status codes, numbered constants, or date conversion tables.
- Low: Represents the lowest value in the range for the specified type.
- High: Denotes the highest value in the range for the specified type.
Examples of Usage
While the use of master..spt_values is not recommended, it has been observed in code snippets in MSDN blogs as a handy source of sequential numbers. However, creating a custom number table is a safer option.
Word of Caution
Despite its use in certain scenarios, master..spt_values is not officially documented by Microsoft. Its structure and values may change in future SQL Server versions. Therefore, relying on it is not advisable.
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