How to select multiple rows by multi-column primary key in MySQL?

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梦毁少年i
梦毁少年i 2021-02-04 16:11

I have a table with a multi-column primary key (city/state/date) and many more columns of data. I\'m looking to get the latest data for each city/state. How do I do that cleanly

2条回答
  •  情深已故
    2021-02-04 16:23

    I think this should do the trick for you:

    select 
        * 
    from 
        data t1
    natural join 
        ( 
            select 
                city, 
                state, 
                max(date) as date
            from 
                data
            group by 
                city, 
                state
        ) t2;
    

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