Скачать или смотреть Tricky SQL Interview Problem Asked in Amazon

In this video we are going to discuss a SQL interview problem asked in Amazon for a Business Intelligence Engineer Position.

Here is the script:
create table purchase_history
(userid int
,productid int
,purchasedate date
);
SET DATEFORMAT dmy;
insert into purchase_history values
(1,1,'23-01-2012')
,(1,2,'23-01-2012')
,(1,3,'25-01-2012')
,(2,1,'23-01-2012')
,(2,2,'23-01-2012')
,(2,2,'25-01-2012')
,(2,4,'25-01-2012')
,(3,4,'23-01-2012')
,(3,1,'23-01-2012')
,(4,1,'23-01-2012')
,(4,2,'25-01-2012')
;
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