Question

我有以下情况：

COL_1   COL_2   COL_3   COL_4   COL_5   COL_6   COL_7
5678      ?        ?       ?       ?       ?    ?
?        6789      ?       ?       ?       ?    ?
?         ?      1223      ?       ?       ?    ?
?         ?        ?      1223     ?       ?    ?
?         ?        ?       ?       1223    ?    ?
?         ?        ?       ?       ?       1223 ?
?         ?        ?       ?       ?       ?    12823

我想要这个：

COL_1   COL_2   COL_3   COL_4   COL_5   COL_6   COL_7
5678    6789    1223    1223    1223    1223    12823

我尝试使用COLAESCE（）函数，但似乎没有把列作为参数。

Answer 1

如果每行都有一个值，您可以在所有列上使用MAX()：

CREATE TABLE #data
(
    col1 INT,
    col2 INT,
    col3 INT
);

INSERT INTO #data
(
    col1,
    col2,
    col3
)
VALUES
(1, NULL, NULL),
(NULL, 2, NULL),
(NULL, NULL, 3);

SELECT MAX(d.col1) AS col1,
       MAX(d.col2) AS col2,
       MAX(d.col3) AS col3
FROM #data AS d;

DROP TABLE #data;

Answer 2

SELECT   SUM( ISNULL(COL1,0)) AS COL_1
        ,SUM(ISNULL(COL2,0)) AS COL_2
        ,SUM(ISNULL(COL3,0)) AS COL_3
        ,SUM(ISNULL(COL4,0)) AS COL_4
        ,SUM(ISNULL(COL5,0)) AS COL_5
        ,SUM(ISNULL(COL6,0)) AS COL_6
        ,SUM(ISNULL(COL7,0)) AS COL_7
FROM YOUR_TABLE

Answer 3

使用COLAESCE会将所有结果输出到一列。使用参数，例如group by或where列不等于＆＃34;？＆＃34;

Answer 4

SELECT
    (SELECT TOP(1) col1 FROM Table1 WHERE col1 IS NOT NULL ORDER BY SortCol) AS col1,
    (SELECT TOP(1) col2 FROM Table1 WHERE col2 IS NOT NULL ORDER BY SortCol) AS col2,
    (SELECT TOP(1) col3 FROM Table1 WHERE col3 IS NOT NULL ORDER BY SortCol) AS col3,
    (SELECT TOP(1) col4 FROM Table1 WHERE col4 IS NOT NULL ORDER BY SortCol) AS col4,
    (SELECT TOP(1) col5 FROM Table1 WHERE col5 IS NOT NULL ORDER BY SortCol) AS col5,
    (SELECT TOP(1) col6 FROM Table1 WHERE col6 IS NOT NULL ORDER BY SortCol) AS col6,
    (SELECT TOP(1) col7 FROM Table1 WHERE col7 IS NOT NULL ORDER BY SortCol) AS col7

如何在SQL中的行中添加非空值

4 个答案: