Tricky SQL Interview Question || Window Function || Case Statement || Data Analyst SQL Interview
In this video we will solve a SQL interview question which was asked in multiple companies for data related roles.
Question :-
Write a SQL to display the Source_Phone_Nbr and a flag where the flag needs to be set to 'Y' if first called number and last called number are the same and 'N' if first called number and last called number are different.
Table Script :-
create table phone_log(
source_phone_nbr int, destination_phone_nbr int,
call_start_date_time datetime)
insert into phone_log
values(2345,6789,'2099-07-01 10:00:00'),
(2345,1234,'2099-07-01 11:00:00'),
(2345,4567,'2099-07-01 12:00:00'),
(2345,4567,'2099-07-01 13:00:00'),
(2345,6789,'2099-07-01 15:00:00'),
(3311,7890,'2099-07-01 10:00:00'),
(3311,6543,'2099-07-01 12:00:00'),
(3311,1234,'2099-07-01 13:00:00')
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