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What are functions and their usage in SQL?

Answer»

SQL functions are short bits of CODE that are commonly used and reused in DATABASE systems to process and manipulate data. The measured values are the functions. It ALWAYS accomplishes a certain goal. When constructing functions, keep the following rules in mind:

  • A function must be given a name, which cannot begin with a special character such as @, $, #, or other characters.
  • Only SELECT statements can be used by functions.
  • It compiles every time a function is called.
  • Functions are required to RETURN a value or a result.
  • Input parameters are always utilised with functions.


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