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Data Interview Qs - State populations

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State populations
SQL Database Querying Window Function

Forward this email to a friend or colleague and challenge them to solve it.

Suppose you come across a table containing 3 fields:

  • country name (country_name)
  • state name (state_name)
  • total population (total_population) #total population for a given state

Using this information, write a function in SQL that returns the following:

  • state_name | total_population | percent_of_country_population

Note the last field, percent_of_country_population, can be calculated by dividing each individual state's population by the total population of its associated country in the table.


 

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