计算出现的位置

Question

SELECT serial, model, owner, COUNT(*) AS occurrences 
FROM cars
GROUP BY serial WHERE owner = 'Mike'
ORDER BY occurrences DESC 
LIMIT 5

如何修改此查询以实际工作？我想计算Mike拥有的5个最常见的序列号，并显示模型 - 所有者 - 现场连续数据的数量。

Answer 1

您必须更改WHERE子句和GROUP BY的顺序。

试试这个：

  SELECT serial, model, owner, COUNT(*) AS occurrences 
  FROM cars
  WHERE owner = 'Mike'
  GROUP BY serial 
  ORDER BY occurrences DESC 
  LIMIT 5