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  3. Improving Query Performance in PostgreSQL

Exercise

Finding the table type

Throughout this course, you have been working with data about Olympic athletes, countries' climate, and countries' demographics. You may have wondered if these data sources were actually tables or instead views. Knowing this information could help you decide how to structure your queries and understand why a query may be slow (e.g. it uses a view).

In this chapter, you will work with air quality data. One of the main data sources is annual_aqi. Determine if it really is a table.

Instructions 1/2

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  • 1

    Select the table_type from the view called tables that is in the information_schema.

  • 2

    Now find all the metadata for a specific table, annual_aqi, using the table_name column as a filter.