Check Data-length of the all the data in the column in Sql Server | query to check size of all the data present in the column

Taking an Example , Suppose we want to check the data-size of all the data present in a column for a Employee table :

Query :

SELECT DATALENGTH(CUSTOMER_ID) AS EMP_ID_LENGTH ,
       DATALENGTH(EMPLOYEE_NAME) AS EMPLOYEE_LENGTH,
       *
FROM EMPLOYEE_TABLE