Question

我有一个包含许多列的表，用于指定错误是否有效。我需要以这样的方式输出：将错误指定为行的列名称以及每个错误的有效字段和无效字段的计数。

下面类似输入和预期输出的示例

id   name            txn_column_name  flag1 flag2 flag3 
1    Resident Count  resident_ct      Y     Y     N
2    Incident Count  incident_ct      Y     Y     Y
3    Facility Status facil_stat       N     N     N

需要输出

Col1_name Y_Count    N_Count
flag1       2            1
flag2       2            1
flag3       1            2

Answer 1

我们可以在此处尝试使用Oracle的UNPIVOT运算符：

SELECT
    flag AS Col1_name,
    COUNT(CASE WHEN val = 'Y' THEN 1 END) AS Y_Count,
    COUNT(CASE WHEN val = 'N' THEN 1 END) AS N_Count
FROM yourTable
UNPIVOT
(
    val FOR (flag) IN (
        flag1 AS 'flag1',
        flag2 AS 'flag2',
        flag3 AS 'flag3'
    )
)
GROUP BY
    flag
ORDER BY
    flag;

Demo

另一个简单的选择是使用一系列联合：

SELECT
    'flag1' AS Col1_name,
    COUNT(CASE WHEN flag1 = 'Y' THEN 1 END) AS Y_Count,
    COUNT(CASE WHEN flag1 = 'N' THEN 1 END) AS N_Count
FROM yourTable
UNION ALL
SELECT 'flag2', COUNT(CASE WHEN flag2 = 'Y' THEN 1 END),
    COUNT(CASE WHEN flag2 = 'N' THEN 1 END)
FROM yourTable
UNION ALL
SELECT 'flag3', COUNT(CASE WHEN flag3 = 'Y' THEN 1 END),
    COUNT(CASE WHEN flag3 = 'N' THEN 1 END)
FROM yourTable
ORDER BY 1;

Oracle中的数据透视表？

1 个答案:

Demo

Demo