好的，4个小时的编码，只有6个小时的搜索......而且我开始时没有比这更好的了。这是我的问题。我有一个表（tmpShell），它有12列。它是一个没有约束的基本表 - 用于临时报告。当我们插入数据时，我必须提取一个ID号（PatientId）和所有列NAMES，其中该PatientId的值为null。
示例：
PatientId Fname Lname DOB 123455 Sam NULL NULL
2345455 NULL Doe 1/1/1980
09172349 John Jone NULL
我想要回归的是：
PatientId ErrorMsg 123455 Lname,DOB
2345455 Fname
09172349 DOB
当然，如果所有列都有值，则errormsg将为null。
我已尝试并失败了大约300个不同的代码，但这似乎是我能得到的最接近的代码。不幸的是，这只返回每一列，而不是空值。
ALTER PROC [sp_aaShowAllNullColumns]
@tableName VARCHAR(255)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @sql NVARCHAR(4000);
DECLARE @cols NVARCHAR(4000);
DECLARE @tcols TABLE ( [colbit] NVARCHAR(255) );
--DECLARE @tablename VARCHAR(255) = 'tmpShell';
INSERT @tcols
SELECT
'count(' + [columns].[name] + ') as ' + [columns].[name] + ', ' AS [colbit]
FROM
[sys].[columns]
WHERE
[columns].[object_id] = OBJECT_ID(@tableName);
SELECT
@cols = COALESCE(@cols, ', ', '') + [@tcols].[colbit]
FROM
@tcols;
SELECT
@cols = SUBSTRING(@cols, 1, ( LEN(@cols) - 1 ));
SELECT
@cols = ISNULL(@cols, '');
SELECT
@sql = 'select patientid, count(*) as Rows' + @cols + ' from ' + @tableName + ' group by patientid having count(*) > 0';
CREATE TABLE [tmpShell2]
(
[patientid] VARCHAR(15)
,[Rows] CHAR(2)
,[Rn] CHAR(2)
,[patId] CHAR(2)
,[fname] CHAR(2)
,[lname] CHAR(2)
,[dob] CHAR(2)
,[addr1] CHAR(2)
,[city] CHAR(2)
,[state] CHAR(2)
,[zip] CHAR(2)
,[country] CHAR(2)
,[psite] CHAR(2)
,[csite] CHAR(2)
,[ssite] CHAR(2)
,[scode] CHAR(2)
,[sfid] CHAR(2)
,[taskid] CHAR(2)
,[errormsg] CHAR(2)
);
INSERT INTO [tmpShell2]
EXEC [sys].[sp_executesql]
@sql;
DECLARE @tbl VARCHAR(255) = 'tmpShell2';
SELECT DISTINCT
[TS].[patientid]
, STUFF((
SELECT DISTINCT
', ' + [C].[name]
FROM
[tmpShell2] AS [TS2]
JOIN [sys].[columns] AS [C]
ON [C].[object_id] = OBJECT_ID(@tbl)
WHERE
[C].[name] NOT IN ( 'SFID', 'TaskId', 'ErrorMsg' )
AND [C].[name] IS NOT NULL
FOR
XML PATH('')
), 1, 1, '')
FROM
[tmpShell2] AS [TS];
DROP TABLE [dbo].[tmpShell2];
END;
GO
EXEC [sp_aaShowAllNullColumns]
'tmpShell';
</pre>
答案 0 :(得分：8)
我认为你复杂的事情。
您可以尝试使用 public static void main(String[] args) {
// The name of the file to open.
String fileName = "file.txt";
int counter = 0;
// This will reference one line at a time
String line = null;
FileReader fileReader = null;
int chars = 0;
int max = 55;
try {
// FileReader reads text files in the default encoding.
fileReader
= new FileReader(fileName);
// Always wrap FileReader in BufferedReader.
BufferedReader bufferedReader
= new BufferedReader(fileReader);
while ((line = bufferedReader.readLine()) != null) {
counter++;
if (counter == 1) {
chars += line.length();
System.out.println(chars);
System.out.println(line);
if (chars == max) {
//if max characters reached jump to the 7th line
counter += 6;
}
System.out.println(counter);
}
}
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}
：
CASE EXPRESSION这将导致SELECT t.patientID,
CASE WHEN t.fname is NULL THEN 'Fname,' ELSE '' END +
CASE WHEN t.Lname is NULL THEN 'Lname,' ELSE '' END +
CASE WHEN t.DOB is NULL THEN 'DOB,' ELSE '' END
..... as ErrorMsg
FROM YourTable t
末尾有一个不必要的逗号，为了处理它你可以这样做：
errorMsg这将使最后一个逗号唯一，因为它将有一个与其连接的空格，并确保它只会被删除。
答案 1 :(得分：3)
这样的事情怎么样？
SELECT
a.PatientID
, CASE a.tmpCol
WHEN '' THEN NULL
ELSE STUFF(a.tmpCol,1,1,'')
END AS ErrorMsg
FROM
(
SELECT
PatientID
, CASE WHEN FirstName IS NULL THEN ',FirstName' ELSE '' END
+ CASE WHEN LastName IS NULL THEN ',LastName' ELSE '' END
+ CASE WHEN DOB IS NULL THEN ',DOB' ELSE '' END AS tmpCol
FROM
<tableName>
) a;
答案 2 :(得分：2)
您可以使用数据透视查询来获得所需的结果。以下查询应该近似于您想要的输出：
SELECT PatientId,
CONCAT(CASE WHEN Fname IS NULL THEN 'Fname ' ELSE '' END,
CASE WHEN Lname IS NULL THEN 'Lname ' ELSE '' END,
CASE WHEN DOB IS NULL THEN 'DOB' ELSE '' END)
FROM yourTable
答案 3 :(得分：1)
这是一个基于https://stackoverflow.com/a/38036046/2314737的SQLfiddle，处理逗号
http://sqlfiddle.com/#!9/708796/1
SELECT PatientId,
REPLACE(RTRIM(CONCAT(CASE WHEN Fname IS NULL THEN 'Fname ' ELSE '' END,
CASE WHEN Lname IS NULL THEN 'Lname ' ELSE '' END,
CASE WHEN DOB IS NULL THEN 'DOB' ELSE '' END)),
' ',',')
FROM YourTable
答案 4 :(得分：0)
这是一个存储过程，它将接受模式名称，表名和列名，然后生成所需的结果。
ALTER PROCEDURE [dbo].[DynamicErrorProducing]
@schema_name NVARCHAR(100),
@table_name NVARCHAR(100),
@column_name NVARCHAR(100)
AS
BEGIN
DECLARE @countTable TINYINT;
DECLARE @countColumn TINYINT;
DECLARE @string NVARCHAR(MAX);
DECLARE @sqlString NVARCHAR(MAX);
SET @countTable=0;
SELECT
@countTable=COUNT(*)
FROM
sys.tables
WHERE
SCHEMA_NAME(schema_id)=@schema_name
AND name=@table_name;
-- If there is no table as described, quit with an error
IF (@countTable = 0)
RETURN 0;
SET @countColumn=0;
SELECT
@countColumn=COUNT(*)
FROM
sys.columns
WHERE
object_id = OBJECT_ID(@schema_name+'.'+@table_name)
AND name=@column_name;
IF (@countColumn<> 1)
RETURN;
SELECT
@countColumn=COUNT(*)
FROM
sys.columns
WHERE
object_id = OBJECT_ID(@schema_name+'.'+@table_name)
AND name<>@column_name;
IF (@countColumn<1)
RETURN;
SELECT @string=STUFF(
(
SELECT
'+ CASE WHEN '+name+' IS NULL THEN '''' ELSE '','+name+''' END '
FROM
sys.columns
WHERE
object_id = OBJECT_ID(@schema_name+'.'+@table_name)
AND name<>@column_name
FOR XML PATH(''))
,1,2,'');
SET @sqlString=N'
SELECT
a.'+@column_name+'
, CASE WHEN a.tmpCol='''' THEN NULL ELSE STUFF(a.tmpCol,1,1,'''') END AS ErrMsg
FROM
(
SELECT
'+@column_name+'
,'+@string+' AS tmpCol
FROM
'+@schema_name+'.'+@table_name+'
) a';
EXEC sp_executesql
@statement=@sqlString;
END
GO