Fragen im Vorstellungsgespräch bei King: Q 3.1: In SQL, what statement... | Glassdoor.de

Frage im Vorstellungsgespräch

Data Scientist-Vorstellungsgespräch Berlin

Q 3.1: In SQL, what statement will count the total number

  of rows in this table? Q 3.2: In SQL, what statement will count the total number of rows corresponding to logins on 1st May 2015? Q 3.3: In SQL, what statement will count the number of unique customers? Q 3.4: In SQL, what statement would be used to create the above table (without any data in it). Q 3.5: In SQL, what is the difference between an inner join and an outer join? Please give an example of some circumstances where you would recommend to use an outer join?
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