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How to quiry from the same table 2 times

Posted on 2007-11-23
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Last Modified: 2010-03-20
Hello,

i am trying to write a quiry that has 2 tables.

Table1:
Companies:
Company Name, Manager Name 1, Manager Name 2.
Exampe Data.
Company ABC, 1, 2
Company DEB, 2, 1

Table 2:
Managers:
Manger_ID, Manager_name
Example Data.
1, Alex
2, Peter
3, Stan

Need to create a quiry to Display manager names.

Thanks in advance,

Roman
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Question by:dizel247
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11 Comments
 
LVL 20

Expert Comment

by:informaniac
ID: 20341860
Is Manager 1 the same as Manager_Id
0
 

Author Comment

by:dizel247
ID: 20341873
Manager1 and Manger2 - to make it clear Person To manage Sales, Person to manage Purchasing

1 is Manager ID
2 is manager ID

So to answer your question YES Manger 1 is related to managers.manager_id

Thanks in advance,

Roman
0
 
LVL 17

Expert Comment

by:Shanmuga Sundaram
ID: 20342357
Based on your input the query will be like as given below.

select * from Companies a, Managers b where a.[Manager Name 1]=b.Manger_ID
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LVL 17

Expert Comment

by:Shanmuga Sundaram
ID: 20342360
or as this.
select * from Companies , Managers  where companies.[Manager Name 1]=managers.Manger_ID
0
 
LVL 93

Accepted Solution

by:
Patrick Matthews earned 252 total points
ID: 20342451
dizel247 said:
>>Manager1 and Manger2 - to make it clear Person To manage Sales, Person to manage Purchasing

I would suggest altering your design to something more like:

tblCompanies
----------------------------------------------------------
CompanyID (PK)
CompanyName

tblRoles
----------------------------------------------------------
RoleID (PK)
RoleDescr

tblManagers
----------------------------------------------------------
ManagerID (PK)
LName
FName

tblManagerCompany
----------------------------------------------------------
CompanyID (PK, FK)
ManagerID (PK, FK)
RoleID (FK)

With this structure, you can track additional managers if you need to, without having to alter your
basic design.
0
 

Author Comment

by:dizel247
ID: 20344882
shasund your solution didnt work for some reason.

matthewspatrick, I have though of that the problem is that I have this information updated on the Companies section. If I create the way you mention I will have to update different tables @ the same time. I belive its will be difficult.

Roman
0
 
LVL 93

Expert Comment

by:Patrick Matthews
ID: 20345538
dizel247 said:
>>matthewspatrick, I have though of that the problem is that I have this information updated on the
>>Companies section. If I create the way you mention I will have to update different tables @ the
>>same time. I belive its will be difficult.

Please explain what you mean.  The design I suggested should *eliminate* the need to update more
than one table at a time, because it removes redundant data.
0
 
LVL 25

Assisted Solution

by:imitchie
imitchie earned 248 total points
ID: 20346518

Select A.CompanyName, B.Manager_Name, C.Manager_Name
From Company A
LEFT JOIN Managers B ON B.Manager_ID = A.Manager1_ID
LEFT JOIN Managers C ON C.Manager_ID = A.Manager2_ID

Open in new window

0
 
LVL 1

Expert Comment

by:Computer101
ID: 20962587
Forced accept.

Computer101
Community Support Moderator
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