Question

我有一个包含三列的表格，我想检查列中的Null或Empty数据Imp或Main或Comp

我使用以下查询：

SELECT Imp,Main,Comp
FROM Items_tbl
WHERE Contributor = 37 
 AND NULLIF(Imp, '') IS NULL
 AND NULLIF(Main, '') IS NULL
 AND NULLIF(Comp, '') IS NULL;

Answer 1

因此，如果您想COUNT行，您可以执行以下操作：

SELECT COUNT(*)
FROM Items_tbl
WHERE Contributor=37 
 AND NULLIF(Imp, '') IS NULL
 AND NULLIF(Main, '') IS NULL
 AND NULLIF(Comp, '') IS NULL;

或者，如果您只需要其中一列为NULL：

SELECT COUNT(*)
FROM Items_tbl
WHERE Contributor=37 
 AND (NULLIF(Imp, '') IS NULL
      OR NULLIF(Main, '') IS NULL
      OR NULLIF(Comp, '') IS NULL
     );

Answer 2

根据您对需要点名的评论......

SELECT Count(*)
  FROM Items_tbl
 WHERE  Contributor=37 and  ISNULL(Imp, '') = '' 
 and   ISNULL(Main, '') = '' 
 and  ISNULL(Comp, '') = '' ;

Answer 3

嗯，我不确定我是否正确理解了这个问题，但是如果你想要3列的所有行都是NULL /空，你可以试试这个：

SELECT     ID, Contributor,
           Imp,
           Main,
           Comp
FROM       Items_tbl
WHERE      Contributor = 37
AND        (Imp IS NULL OR Imp = '')
AND        (Main IS NULL OR Main = '')
AND        (Comp IS NULL OR Comp = '')

你可以在这里看到 - ＆gt; SQL fiddle

请注意，对于此查询，要么所有3列都应该全部为NULL或全部为空。

如果您希望所有上述列中的一行都为NULL /空的行，您可以使用`UNION＆＃39;得到这个如下：

SELECT     ID, Contributor,
           Imp,
           Main,
           Comp
FROM       Items_tbl
WHERE      Contributor = 37
AND        (Imp IS NULL OR Imp = '')
AND        (Main IS NULL OR Main = '')
AND        (Comp IS NULL OR Comp = '')

UNION

SELECT     ID, Contributor,
           Imp,
           Main,
           Comp
FROM       Items_tbl
WHERE      Contributor = 37
AND        (Imp IS NULL)
OR         (Main IS NULL)
OR         (Comp IS NULL)

在此处查看 - ＆gt; SQL fiddle

希望这有帮助!!!

Answer 4

试试这个。

修改

SELECT Imp,Main,Comp FROM Items_tbl WHERE Contributor=37 AND COALESCE(NULLIF(ISNULL(Imp,''),''),NULLIF(ISNULL(Main,''),''),NULLIF(ISNULL(Comp,''),'')) is NULL

检查SQL Server中三列中的null或空数据

4 个答案: