fbpx

78. Filling-in Empty Values

This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.
 

This exercise requires performing the opposite operation compared with the previous question. The “Northern Wind” travel store manages a table that holds the addresses of its customers. You can see that each row indicates the state, city, and address of each customer. In the State and City columns, when a certain value repeats itself, it is replaced with NULL:


CREATE TABLE customerLocations
(c_city varchar(25),
c_state varchar(25),
c_address varchar(50))
GO

To read more

UpScale Analytics is one of the largest platforms in the world for learning SQL by doing, consisting over 300 SQL exercises at different levels (including solutions), by topics, across over 100 different datasets. More…