Question

我需要为A和B列仅提取0个值的ID。一个例子：


+----+------+------+
| ID |   A  |   B  |  
+----+------+------+
|  1 | null | 123  |  
|  2 | 23   | 768  |  
|  3 | 0    | 0    |  
|  4 | 96   | 0    |  
|  5 | 0    | null | 
|  6 | 0    | 0    |  
+----+------+------+

我尝试了几次查询，但是我仍在遍历大于0的值。由于表中存在空值，因此我使用NVL（expr1,0）语法将空值替换为0：

+----+------+------+
| ID |   A  |   B  |  
+----+------+------+
|  1 |  0   | 123  |  
|  2 | 23   | 768  |  
|  3 | 0    | 0    |  
|  4 | 96   | 0    |  
|  5 | 0    | 0    | 
|  6 | 0    | 0    |  
+----+------+------+

我在WHERE子句中使用以下内容，并获得以下结果：


Where status = 'OPEN'
   AND a.value IS NULL OR a.value = '0'
   AND b.value IS NULL OR b.value = '0'

Output:

+----+----+-----+
| ID | A  |  B  |
+----+----+-----+
|  1 |  0 | 123 | 
|  3 |  0 |   0 |  
|  5 |  0 |   0 | 
|  6 |  0 |   0 | 
+----+----+-----+

似乎我只为A拉取0个值，但对于B我仍然得到大于0的值。我只需要为A和B都拉取值为0的ID。

Answer 1

我认为您只需要括号即可

Where status = 'OPEN' AND
      (a.value IS NULL OR a.value = 0) AND
      (b.value IS NULL OR b.value = 0)

Answer 2

我喜欢戈登的回答，但为了简洁起见，我在这里使用COALESCE：

SELECT *
...
WHERE
    status = 'OPEN' AND
    COALESCE(a.value, 0) = 0 AND
    COALESCE(b.value, 0) = 0;

我们也可以用总和表示：

WHERE
    status = 'OPEN' AND
    COALESCE(a.value, 0) + COALESCE(b.value, 0) = 0;

Oracle条件仅拉“ 0”值

2 个答案: