What is the usage of SQL functions?
 

SQL functions are used for following purpose:

To perform calculations on data.
To modify individual data items.
To manipulate the output.
To format dates and numbers.
To convert data types.

SQL functions are used extensively in databases to manipulate and process data. All SQL systems have built-in as well as user-defined SQL functions. SQL functions can act on each individual row of data or on multiple rows of data grouped on the values of a field (or fields) in the table.

MySQL function is a stored program that can be called when required and passed parameters to get a value in return. You can create your own functions, but there are many built-in functions provided you can use off the shelves.

You can use the functions in SQL statements or as queries in MySQL. Alternatively, they can also be used within a MySQL programming environment.

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MySQL can’t even touch MS SQLServer's performance and power, especially with a properly set up multi-tiered, multi-server, multi-node, multi-cluster, and high availability setup. Also, with MS SQLserver you are already paying for SSIS, SSRS, and SSAS which are the best ETL tools, the easiest to use reporting tools, and by far the only tabular or multi-dimensional (cube) development framework that should ever be discussed.

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