SQL: Select most recent date for each category

Question

I\'m pulling data from a database and one of the tables contain two columns that together identify a location and another column containing a date of each time it was servic

Answer 1

SELECT
    category_a,
    category_b,
    MAX(date)
FROM
    Some_Unnamed_Table
GROUP BY
    category_a,
    category_b
ORDER BY
    category_a,
    category_b

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