Select from following answers:- As Column_Name.
- As 'Column Name'.
- As [Column Name].
- All of the above.
- All Above
Above all options are used to assign Aliases to columns.
For Example:-
select employee_id as emp_id from table.
select employee_id as 'emp id' from table.
select employee_id as 'emp_id' from table.
select employee_id as [emp id] from table.
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