比find_in_set更好的性能选项

Question

当前我的代码是：

Find_in_set(beerkezes, (SELECT Group_concat(beerkezes ORDER BY beerkezes
                                  ASC)
                           FROM   versenyzo as x
                           WHERE  beerkezes <> '00:00:00'
                                  AND v.tav = x.tav AND `szuletesidatum`<`zarodate` AND `szuletesidatum`>`kezdodate` AND v.nem=x.nem))

我需要基于“ beerkezes”列获取子查询中该行的排名。最好使用索引等。 是的

Answer 1

如果您使用的是MySQL 8.0，则可以使用ROW_NUMBER()：

SELECT *, ROW_NUMBER() OVER(PARTITION BY x.nem, x.tav ORDER BY beerkezes) AS rn
FROM   versenyzo as x
WHERE  beerkezes <> '00:00:00'
  AND `szuletesidatum`<`zarodate` 
  AND `szuletesidatum`>`kezdodate`