1 Essential Oracle SQL Interview Question *

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What is wrong with the below statement?

select employee_id emp, last_name emp_name, hire_date date 
from employees;

date has been used as an alias to the hire_date column, but we cannot use any Oracle reserved keyword as an alias. If want to use it, we have to mention it in quotation marks:

select employee_id emp, last_name emp_name, hire_date "date" 
from employees;

There is more to interviewing than tricky technical questions, so these are intended merely as a guide. Not every “A” candidate worth hiring will be able to answer them all, nor does answering them all guarantee an “A” candidate. At the end of the day, hiring remains an art, a science — and a lot of work.

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Pablo Albella

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BrazilToptal Member Since January 30, 2014

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