How to Prefix 0's in Athena Query?

I have fixed this by adding an If condition.

This is what worked for me: select IF(LENGTH(employee_id)<8,LPAD(employee_id,8,'0'),employee_id) from table1

The third argument is expected to be a string for LPAD function - can you pelase try it like this?

select LPAD(CAST(employee_id As varchar),8,'0') as EmployeeID

Thank you for your response. I tried this last night and found a problem with Lpad function. Its prefixing the 0's however, its also truncating the string if the string size is more than the size of the padding we give. Just wondering if there is any way we can avoid truncating.

select lpad(employee_id,8,'0') from table1 --> This is prefixing 0's to employee id less than 8 however its also truncating employee ids more than 8 characters.

Example: 123456 --> 00123456 123456789012 --> 12345678