如何聯接同一表以檢查a> b是否為10

Question

表mytable

id      numbers       whereonly

1       2                1
2       35               1
3       22               1
4       20               1
5       3                1
6       70               1
7       80.15925         1
8       60               7
9       50               7

我需要按數字排序並以ID 1進行搜索，直到找到一個ID，其ID的數字行大10。
期望的結果：2，20，35，70，80.15925
僅在列whereonly為1的地方
有沒有辦法做到這一點？

Answer 1

您可以嘗試一下：

SELECT DISTINCT t1.id AS id, t1.numbers AS numbers
FROM table AS t1
INNER JOIN table AS t2 ON t1.numbers > t2.numbers - 10
WHERE t1.whereonly = 1
GROUP BY t2.numbers
ORDER BY t1.numbers;

這是sqlfiddle 。

編輯1： 草莓建議

SELECT DISTINCT x.* 
  FROM mytable x
  JOIN
     ( SELECT t2.numbers t2n
            , MIN(t1.id) id
         FROM mytable t1
         JOIN mytable t2 
           ON t1.numbers > t2.numbers - 10
        GROUP 
           BY t2.numbers
     ) y
    ON y.id = x.id
    ORDER BY x.numbers
    WHERE x.whereonly = 1;

這是sqlfiddle 。