Question

如果给定参数没有这样的记录，我试图返回默认值。这是sql查询：

DECLARE @List VARCHAR(max) 
DECLARE @date VARCHAR(max)
SET @List = '''4401366'',''3115880'''
SET @date = '''2018-02-09 00:00:00.000'''
DECLARE @SQL NVARCHAR(max)
SET @SQL = N'
select  EmpNo,  attendanceStatus =

CASE 
WHEN AttDate is null then ''false''
WHEN max(AttTimeIn) is null and max(AttTimeOut) is null THEN ''false''
WHEN max(AttTimeIn) is not null and max(AttTimeOut) is not null then(case when (max(AttTimeIn) < max(AttTimeOut)) then ''false'' else ''true'' end)
WHEN max(AttTimeIn) is not null and max(AttTimeOut) is null  THEN ''true''
else ''false''
end

from tablename
where empNo in (' +@list+ ')  AND AttDate = ('+ @date +')
group by EmpNo, AttDate'

EXEC sp_executesql @SQL

更具体地说，如果给定日期（对于每个员工）没有这样的记录，我希望attendanceStatus返回false。我怎样才能做到这一点？

Answer 1

我相信你需要这样的东西，但没有数据就很难测试：

SET @SQL = N'
SELECT      T0.EmpNo
,           attendanceStatus = CASE 
                                    WHEN T1.empNo is null 
                                        THEN ''false''
                                    WHEN max(T1.AttTimeIn) is null and max(T1.AttTimeOut) is null 
                                        THEN ''false''
                                    WHEN max(T1.AttTimeIn) is not null and max(T1.AttTimeOut) is not null 
                                        THEN(CASE WHEN (max(T1.AttTimeIn) < max(T1.AttTimeOut)) 
                                                THEN ''false'' else ''true'' END)
                                    WHEN max(T1.AttTimeIn) is not null and max(T1.AttTimeOut) is null  
                                        THEN ''true''
                                        ELSE ''false''
                                END
FROM        tablename T0
LEFT JOIN   tablename T1
        ON  T1.empNo = T0.empNo
        AND T1.AttDate = ('+ @date +')
WHERE       T0.empNo in (' +@list+ ')  
GROUP BY    T0.EmpNo
,           T1.AttDate
'

Answer 2

你可以试试这个。

DECLARE @List VARCHAR(max) 
DECLARE @date VARCHAR(max)
SET @List = '''4401366'',''3115880'''
SET @date = '''2018-02-09 00:00:00.000'''
DECLARE @SQL NVARCHAR(max)
SET @SQL = N'
select  EmpNo,  attendanceStatus =
    CASE WHEN AttDate = ('+ @date +') THEN 
        CASE 
            WHEN max(AttTimeIn) is null and max(AttTimeOut) is null THEN ''false''
            WHEN max(AttTimeIn) is not null and max(AttTimeOut) is not null then(case when (max(AttTimeIn) < max(AttTimeOut)) then ''false'' else ''true'' end)
            WHEN max(AttTimeIn) is not null and max(AttTimeOut) is null  THEN ''true''
            ELSE ''false''
        END
    ELSE ''false'' END
from tablename
where empNo in (' +@list+ ')  
group by EmpNo, AttDate'

EXEC sp_executesql @SQL

Answer 3

这应该有效

DECLARE @List VARCHAR(max) 
DECLARE @date VARCHAR(max)
SET @List = '''4401366'',''3115880'''
SET @date = '''2018-02-09 00:00:00.000'''
DECLARE @SQL NVARCHAR(max)
SET @SQL = N'
--check if employee exists
with empTable as (
SELECT DISTINCT EmpNo
FROM tablename
WHERE empNo in (' +@list+ '))

select  Et.EmpNo,  attendanceStatus =

CASE 
WHEN T.AttDate is null then ''false''
WHEN max(T.AttTimeIn) is null and max(T.AttTimeOut) is null THEN ''false''
WHEN max(T.AttTimeIn) is not null and max(T.AttTimeOut) is not null then(case when (max(T.AttTimeIn) < max(T.AttTimeOut)) then ''false'' else ''true'' end)
WHEN max(T.AttTimeIn) is not null and max(T.AttTimeOut) is null  THEN ''true''
else ''false''
end

from 
empTable eT 
LEFT JOIN tablename T ON
    et.EmpNo=T.EmpNo
where T.AttDate = ('+ @date +')
group by et.EmpNo, T.AttDate'

EXEC sp_executesql @SQL

Answer 4

我重写了您的代码，简化了案例陈述并删除了一些代码

AttDate is null then 'false'

AttDate永远不会为null，因为它包含在 where子句

中

我还更改了 @date 的数据类型，并将其作为日期的参数化查询。由于 @List ，您的脚本仍然容易被sql注入。将其拆分为表可以避免这种情况。

我不确定您要用默认值替换的内容。但这是改进的脚本：

DECLARE @List VARCHAR(max) 
DECLARE @date DATE
SET @List = '''4401366'',''3115880'''
SET @date = '2018-02-09'
DECLARE @SQL NVARCHAR(max)
SET @SQL = N'
  SELECT coalesce(EmpNo, ''default'') EmpNo,
  CASE WHEN i is not null and (i >= o or o is null) THEN ''true'' ELSE ''false'' END
  FROM
  (
    SELECT
      Empno,
      max(AttTimeIn) over (partition by EmpNo) i,
      max(AttTimeOut) over (partition by EmpNo)o
    FROM tablename  
    WHERE empNo in (' +@list+ ')  AND AttDate = @date
    GROUP BY EmpNo, AttDate
  ) x
  GROUP BY EmpNo'

EXEC sp_executesql @SQL, N'@date date', @date

返回默认值

4 个答案: