The only thing I require from an SQL formatter is to make typos and boolean mistakes super easy to spot, especially as it grows in size. At first glance it might seem strange, but I like indentation on even the first term of an AND.

    SELECT
        a,
        b,
        count(*) as count
    FROM
        table
    JOIN
        table2
    ON
            table.key1 = table2.key1
        AND
            table.key2 = table2.key2
        AND
            -- 1 day apart
            DATEADD('day', 1, table.key3) = table2.key3
    WHERE
            cond1
        AND
            cond2
        AND
            (
                cond3
            OR
                cond4
            )
    GROUP BY
        (a, b)
    ORDER BY
        count desc,
        a asc
    LIMIT
        1000
    ;

Yes, that's a lot of whitespace, but it helps for complex queries.