Question

我目前有一个表，它在一个我无法改变的系统中。所以不是理想的格式，我知道，但我需要计算6列以显示是否输入了某些内容然后将总和放在最后一列中。条目是文本，所以我只需要知道6列中的总数。

[data1]
[data2]
[data3]
[data4]
[data5]
[data6]
--To be created [totalcount]

Answer 1

如果我理解正确：

select t.*,
       ( (case when col1 is not null then 1 else 0 end) +
         (case when col2 is not null then 1 else 0 end) +
         (case when col3 is not null then 1 else 0 end) +
         (case when col4 is not null then 1 else 0 end) +
         (case when col5 is not null then 1 else 0 end) +
         (case when col6 is not null then 1 else 0 end)
       ) as num_notnull
from t;

Answer 2

首先要考虑的是空字符串（''）是否为空。然后，您可以对整个表格执行以下操作：

SELECT
    COUNT(CASE WHEN T.Col1 IS NULL OR T.Col1 = '' THEN 1 END) Col1Blanks,
    COUNT(CASE WHEN T.Col2 IS NULL OR T.Col2 = '' THEN 1 END) Col2Blanks,
    COUNT(CASE WHEN T.Col3 IS NULL OR T.Col3 = '' THEN 1 END) Col3Blanks,
    COUNT(CASE WHEN T.Col4 IS NULL OR T.Col4 = '' THEN 1 END) Col4Blanks,
    COUNT(CASE WHEN T.Col5 IS NULL OR T.Col5 = '' THEN 1 END) Col5Blanks,
    COUNT(CASE WHEN T.Col6 IS NULL OR T.Col6 = '' THEN 1 END) Col6Blanks
FROM
    YourTable T

如果你需要所有这些的总和（ISNULL是一个SQL Server函数，每个DMBS都有一个等价物）：

SELECT
    X.Col1Blanks,
    X.Col2Blanks,
    X.Col3Blanks,
    X.Col4Blanks,
    X.Col5Blanks,
    X.Col6Blanks,
    ISNULL(X.Col1Blanks, 0) +
        ISNULL(X.Col2Blanks, 0) +
        ISNULL(X.Col3Blanks, 0) +
        ISNULL(X.Col4Blanks, 0) +
        ISNULL(X.Col5Blanks, 0) +
        ISNULL(X.Col6Blanks, 0) TotalBlanks
FROM
    (
    SELECT
        COUNT(CASE WHEN T.Col1 IS NULL OR T.Col1 = '' THEN 1 END) AS Col1Blanks,
        COUNT(CASE WHEN T.Col2 IS NULL OR T.Col2 = '' THEN 1 END) AS Col2Blanks,
        COUNT(CASE WHEN T.Col3 IS NULL OR T.Col3 = '' THEN 1 END) AS Col3Blanks,
        COUNT(CASE WHEN T.Col4 IS NULL OR T.Col4 = '' THEN 1 END) AS Col4Blanks,
        COUNT(CASE WHEN T.Col5 IS NULL OR T.Col5 = '' THEN 1 END) AS Col5Blanks,
        COUNT(CASE WHEN T.Col6 IS NULL OR T.Col6 = '' THEN 1 END) AS Col6Blanks
    FROM
        YourTable T
    ) X

计算SQL表中的条目

2 个答案: