Question

我有一张像下面这样的表格

acct_nbr    counter_1   Counter_2   counter_3
1234           1           1           1
2345           0           2           1
5678           1           0           1
9876           0           0           1
4567           1           0           0
2804           0           1           1
4321           2           1           1

我需要根据计数器生成输出。如果所有三个计数器都是 1 或计数器之一是 1 而其他计数器不大于 1，那么我需要结果集中的那些行。预期输出：

acct_nbr    counter_1   Counter_2   counter_3
1234           1           1           1
5678           1           0           1
9876           0           0           1
4567           1           0           0
2804           0           1           1

我试过了

SELECT *
FROM TABLE
WHERE counter_1 = 1 OR Counter_2 = 1 OR counter_3 = 1

但这会返回所有行。你能帮我修复我的查询以获得所需的输出吗？

Answer 1

你想要：

SELECT *
FROM   table_name
WHERE  ( counter_1 = 1 OR counter_2 = 1 OR counter_3 = 1 )
AND    counter_1 <= 1
AND    counter_2 <= 1
AND    counter_3 <= 1

或（虽然是一个更简单的查询，但 Oracle 不会在列上使用索引，而是需要基于函数的索引）：

SELECT *
FROM   table_name
WHERE  GREATEST( counter_1, counter_2, counter_3 ) = 1

对于样本数据：

CREATE TABLE table_name ( acct_nbr, counter_1, Counter_2, counter_3 ) AS
SELECT 1234, 1, 1, 1 FROM DUAL UNION ALL
SELECT 2345, 0, 2, 1 FROM DUAL UNION ALL
SELECT 5678, 1, 0, 1 FROM DUAL UNION ALL
SELECT 9876, 0, 0, 1 FROM DUAL UNION ALL
SELECT 4567, 1, 0, 0 FROM DUAL UNION ALL
SELECT 2804, 0, 1, 1 FROM DUAL UNION ALL
SELECT 4321, 2, 1, 1 FROM DUAL UNION ALL
SELECT 7654, 0, 0, 0 FROM DUAL;

输出：

<块引用>

<头>

ACCT_NBR	COUNTER_1	COUNTER_2	COUNTER_3
1234	1	1	1
5678	1	0	1
9876	0	0	1
4567	1	0	0
2804	0	1	1

db<>fiddle here

<块引用>

如果三个计数器都为 0，我需要过滤我们的行。

假设这要求在所有 3 个值都为零时包含行，那么您可以使用（假设仅非负整数值）：

SELECT *
FROM   table_name
WHERE  counter_1 IN ( 0, 1 )
AND    counter_2 IN ( 0, 1 )
AND    counter_3 IN ( 0, 1 )

或

SELECT *
FROM   table_name
WHERE  GREATEST( counter_1, counter_2, counter_3 ) <= 1

db<>fiddle here

Answer 2

您的描述似乎是：

where greatest(counter_1, counter_2, counter_3) <= 1

或者：

WHERE counter_1 <= 1 AND Counter_2 <= 1 AND counter_3 <= 1

或者，根据您的评论——假设这些值都是非负的：

where greatest(counter_1, counter_2, counter_3) <= 1 and
      least(counter_1, counter_2, counter_3) > 0

如何根据过滤条件选择行

2 个答案: