sqlserver CAST

CAST is a SQL Server function used to convert one data type to another. It allows you to explicitly specify the desired data type for a value or column in a query. Here's the basic syntax:

CAST(expression AS data_type)

The `expression` can be any valid SQL Server expression, such as a column, variable, or literal value. The `data_type` specifies the target data type to which you want to convert the expression.

For example, if you have a column `Age` of type `int` and you want to convert it to `varchar`, you can use CAST like this:

SELECT CAST(Age AS varchar) AS ConvertedAge FROM YourTable

This will return a new column `ConvertedAge` with the age values converted to `varchar`.

Keep in mind that not all data type conversions are supported, and you should ensure that the conversion is valid for your specific scenario.