SQL SERVER – Convert Text to Numbers (Integer) – CAST and CONVERT

How to convert text to integer in SQL?
If table column is VARCHAR and has all the numeric values in it, it can be retrieved as Integer using CAST or CONVERT function.

How to use CAST or CONVERT?

SELECT CAST(YourVarcharCol AS INT) FROM Table
SELECT CONVERT(INT, YourVarcharCol) FROM Table

Will CAST or CONVERT thrown an error when column values converted from alpha-numeric characters to numeric?
YES.

Will CAST or CONVERT retrieve only numbers when column values converted from alpha-numeric characters to numeric?
NO.