Question

<pre>
I have 3 tables and one table valued function: EmpHistory,EmpRank,Emp and fnEmpRank.
The sample data are given as follows:
EmpHistory
EmpHistID  EmpID  RankID  MonitorDate  RankName
1          aba     JPR     2008-10-06   Junior Prof
2          aba     JPR     2009-11-07   Junior Prof
3          aba     TERM    2012-2-08    Termoinated Prof
4          aba     ASST    2012-6-22     lab Assistant
5          aba     ASST    2012-7-2      Lab Assistant
6          aba     TSST    2012-8-4      Terminated Assistant

EmpRank
RankID    RankName
JPR       Junior Professor
SPR       Senior Professor
ASST      Junior Assistant
SASST     Senior Assistant
PL        Principal

Employee
EmpID    EmpStartDate
aba       2008-10-06
abc01     2007-09-23
sdh        2009-7-26
sbs        2012-2-8


The fnEmpRank function takes the emproleID and gives the employee history same as the empHistory Table. There is also empoyeerole table which has employeeroleid column.

Now my problem is: I want the second last professor rank of the employee i.e in this case I want Junior Professor row(i.e) 2nd row from emphistory table). Currntly my code is using emphistory table but now intead of that table I want to use fnEmpRank as it gives the same data. I am also giving the sample code.


select
a.EmpID,
a.StartDate,
J.RankID,
c.MonitorDate,
from dbo.vwEmployee A(nolock)
INNER join dbo.EmpHistory c(nolock) on c.Empid = a.EmpID
and c.EmpHistoryID = (select max(c1.EmpHistoryID)
            from dbo.EmpHistory c1(nolock)
            where c1.Empid = c.EmpID
            and c1.MonitorDate = 
                    (

我有3个表和一个表值函数：EmpHistory，EmpRank，Emp和fnEmpRank。样本数据如下：

创建表EmpHistory（ EmpHistID int， EmpID varchar， RankID varchar， Monitordate日期， Rankname varchar）

插入EmpHistory 选择1，'aba'，'JPR'，'2008-10-6'，'初级教授'

插入EmpHistory 选择2，'aba'，'JPR'，'2009-11-7'，'初级教授'

插入EmpHistory 选择3，'aba'，'TERM'，'2012-2-8'，'终止教授'

插入EmpHistory 选择4，'aba'，'ASST'，'2012-6-22'，'Lab Assistant'

插入EmpHistory 选择5，'aba'，'ASST'，'2012-7-2'，'Lab Assistant'

插入EmpHistory 选择1，'aba'，'JPR'，'2012-8-4'，'终止助理'

创建表EmpRank（ RankID varchar， RankName varchar ）

插入EmpRank 选择'JPR'，'初级教授'

插入EmpRank 选择'SPR'，'高级教授'

插入EmpRank 选择'ASST'，'初级助理'

插入EmpRank 选择'SASST'，'高级助理'

插入EmpRank 选择'PL'，'Principal'

创建表员工（ EmpID varchar， EmpStartDate日期）

插入员工选择'aba'，'2008-10-06'

插入员工选择'abc01'，'2007-9-23'

插入员工选择'sdh'，'2009-7-26'

插入员工选择'sbs'，'2012-2-8'

The fnEmpRank function takes the emproleID and gives the employee history same as the empHistory Table. There is also empoyeerole table which has employeeroleid column.

Now my problem is: I want the second last professor rank of the employee i.e in this case I want Junior Professor row(i.e) 2nd row from emphistory table). Currntly my code is using emphistory table but now intead of that table I want to use fnEmpRank as it gives the same data. I am also giving the sample code.


select
a.EmpID,
a.StartDate,
J.RankID,
c.MonitorDate,
from dbo.vwEmployee A(nolock)
INNER join dbo.EmpHistory c(nolock) on c.Empid = a.EmpID
and c.EmpHistoryID = (select max(c1.EmpHistoryID)
            from dbo.EmpHistory c1(nolock)
            where c1.Empid = c.EmpID
            and c1.MonitorDate = 
                    (
                    SELECT MAX(C2.MonitorDate)
                    FROM dbo.EmpHistory C2
                    WHERE C2.EmpID = C1.EmpID
                    )

                    )
join dbo.EmpRank d(nolock) on d.RankID = a.RankID
left join dbo.EmpHistory f(nolock) on f.EmpID = a.EmpID
    and f.EmpHistoryID = (select max(g.EmpHistoryID)
                from dbo.EmpHistory g(nolock)
                where g.EmpID = a.EmpID
                AND G.RankID not like 'T%'
                and g.EmpHistoryID &lt; c.EmpHistoryID)
left join dbo.EmpRank h(nolock) on h.RankID = f.RankID

LEFT JOIN dbo.EmpHistory J(NOLOCK) ON J.EmpID = A.EmpID 
    AND J.EmpHistoryID = (
        SELECT max(K.EmpHistoryID )
        FROM dbo.EmpHistory K(NOLOCK) 
        WHERE K.EmpID = J.EmpID
        AND K.AgentRankID NOT LIKE 'T%'
        AND K.MonitorDate = (
            SELECT max(M.MonitorDate )
            FROM dbo.EmpHistory M(NOLOCK)
            WHERE M.EmpID = J.EmpID 
            AND M.RankID NOT LIKE 'T%'
        )
    )

where
A.Prof=1
 c.RankID like 'T%'
AND c.RankID <>'TSST'
AND A.StartDate is not null

Here there is one more problem: Even if the Employee is terminated from professor to Assitant, A.Prof values is still 1 and basically Assistant dont have the start dates but when professor are transformed to Assitant, they still contain the start date. How can I handle this in the code. Basically this code assumes that that if emp has the start date then he is the professor. Can any one help me?


                    SELECT MAX(C2.MonitorDate)
                    FROM dbo.EmpHistory C2
                    WHERE C2.EmpID = C1.EmpID
                    )

                    )
join dbo.EmpRank d(nolock) on d.RankID = a.RankID
left join dbo.EmpHistory f(nolock) on f.EmpID = a.EmpID
    and f.EmpHistoryID = (select max(g.EmpHistoryID)
                from dbo.EmpHistory g(nolock)
                where g.EmpID = a.EmpID
                AND G.RankID not like 'T%'
                and g.EmpHistoryID < c.EmpHistoryID)
left join dbo.EmpRank h(nolock) on h.RankID = f.RankID

LEFT JOIN dbo.EmpHistory J(NOLOCK) ON J.EmpID = A.EmpID 
    AND J.EmpHistoryID = (
        SELECT max(K.EmpHistoryID )
        FROM dbo.EmpHistory K(NOLOCK) 
        WHERE K.EmpID = J.EmpID
        AND K.AgentRankID NOT LIKE 'T%'
        AND K.MonitorDate = (
            SELECT max(M.MonitorDate )
            FROM dbo.EmpHistory M(NOLOCK)
            WHERE M.EmpID = J.EmpID 
            AND M.RankID NOT LIKE 'T%'
        )
    )

where
A.Prof=1
 c.RankID like 'T%'
AND c.RankID <>'TSST'
AND A.StartDate is not null

Here there is one more problem: Even if the Employee is terminated from professor to Assitant, A.Prof values is still 1 and basically Assistant dont have the start dates but when professor are transformed to Assitant, they still contain the start date. How can I handle this in the code. Basically this code assumes that that if emp has the start date then he is the professor. Can any one help me?
</pre>

Answer 1

 create fnemprank(@inputrankid int)
 returns @result table(
         EmpHistID int,
         EmpID nvarchar,
         RankID nvarchar,
         MonitorDate  date,
         RankName nvarchar)
 as
 begin
     insert into @result (EmpHistID,EmpID,RankID,MonitorDate,RankName)
     select top 1 * from emphistory eh where eh.rankid=@inputrankid 
     order by eh.monitordate desc
 return
 end

使用Table值函数代码

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