find coumn name and his type with greatest size in bytes

Hello all!
can you help, i need to write a query that displays column name with his
data type that have maximum bytes length in row for every table in database:

for example, for table employees with data:
emp_id, emp_name, emp_dept, emp_surname
1 alexey 2 trew

i need to get such output:

table_name, emp_id, column_name, bytes, datatype
employees 1 emp_name 6 text