SQL ROW_NUMBER，INNER JOIN

Question

我需要在以下查询中使用ROW_NUMBER（）以返回结果的第5至10行。 谁能告诉我我需要做什么？ 我一直都无济于事。 如果有人可以提供帮助，我将非常感激。

SELECT * 
FROM   villa_data 
       INNER JOIN villa_prices 
         ON villa_prices.starRating = villa_data.starRating 
WHERE  villa_data.capacity >= 3 
       AND villa_data.bedrooms >= 1 
       AND villa_prices.period = 'lowSeason' 
ORDER  BY villa_prices.price, 
          villa_data.bedrooms, 
          villa_data.capacity 

Answer 1

您需要将其粘贴在表表达式中以对ROW_NUMBER进行过滤。 您将无法使用* ，因为它将抱怨列名starRating出现多次，因此需要明确列出所需的列。 无论如何，这是更好的做法。

WITH CTE AS
(
SELECT /*TODO: List column names*/
       ROW_NUMBER() 
          OVER (ORDER BY villa_prices.price, 
                         villa_data.bedrooms, 
                         villa_data.capacity) AS RN
FROM   villa_data 
       INNER JOIN villa_prices 
         ON villa_prices.starRating = villa_data.starRating 
WHERE  villa_data.capacity >= 3 
       AND villa_data.bedrooms >= 1 
       AND villa_prices.period = 'lowSeason' 

)
SELECT /*TODO: List column names*/
FROM CTE
WHERE RN BETWEEN 5 AND 10
ORDER BY RN

Answer 2

您可以使用with子句。 请尝试以下

WITH t AS
(
SELECT villa_data.starRating, 
   villa_data.capacity,
   villa_data.bedrooms,
   villa_prices.period,
   villa_prices.price,
   ROW_NUMBER() OVER (ORDER BY villa_prices.price, 
      villa_data.bedrooms, 
      villa_data.capacity ) AS 'RowNumber'
FROM   villa_data 
   INNER JOIN villa_prices
     ON villa_prices.starRating = villa_data.starRating 
WHERE  villa_data.capacity >= 3 
   AND villa_data.bedrooms >= 1 
   AND villa_prices.period = 'lowSeason' 
)
SELECT * 
FROM t 
WHERE RowNumber BETWEEN 5 AND 10;