Concatenating cities and states

In the previous exercise, you used the + operator to combine two columns into one. This time you need to do the same, but using the CONCAT() function.

To get this format for the concatenation: 'Las Vegas, Nevada', you will need to use the CASE expression in case the state column has NULL values.

Este ejercicio forma parte del curso

Cleaning Data in SQL Server Databases

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Instrucciones del ejercicio

Concatenate the names of the cities with the states using the CONCAT() function, while using a CASE statement that returns '' when state is NULL and performs a normal concatenation otherwise.

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SELECT 
		client_name,
		client_surname,
    -- Use the function to concatenate the city and the state
		___(
				___,
				CASE WHEN state IS NULL THEN '' 
				ELSE ___(', ', ___) END) AS city_state
FROM clients

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