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ROW_NUMBER() in MySQ

I want the row with the single highest col3 for each (col1, col2) pair. That’s a groupwise maximum, one of the most commonly-asked SQL questions (since it seems like it should be easy, but actually it kind of isn’t). I often plump for a null-self-join: “Get the rows in the table for which no other … Read more

SQL select only rows with max value on a column

At first glance… All you need is a GROUP BY clause with the MAX aggregate function: It’s never that simple, is it? I just noticed you need the content column as well. This is a very common question in SQL: find the whole data for the row with some max value in a column per some group identifier. I heard that … Read more