• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 259
  • Last Modified:

Combine three tables

Hello:

I have three tables that look like this:

TableA

PersonNane
IDCodeAbbv
WorkID
Location
WorkDate

TableB
IDCodeAbbv
IDCodeName

TableC
WorkID
WorkLocation

In TableA if IDCodeAbbv is not null than WorkID will not be in TableC but IDCodeAbbv will be in TableB. If WorkID is not null than WorkID will be in TableC. At no time, will either IDCodeAbbv or WorkID be null at the same time.

This is an example of how the output should look like

PersonName        WorkID      WorkLocation          IDCodeAbbv               IDCodeName
Dan                          2                 Base 1                                                        
Tom                                                                             SR                        South Rear
John                        4                 Base 2
Sam                                                                             NE                        North Entrance
0
RecipeDan
Asked:
RecipeDan
  • 2
  • 2
2 Solutions
 
COANetworkCommented:
SELECT
	A.PersonName,
	C.WorkID,
	C.WorkLocation,
	B.IDCodeAbbv,
	B.IDCodeName
FROM TableA A WITH(NOLOCK)
LEFT JOIN TableB B WITH(NOLOCK) ON A.IDCodeAbbv = B.IDCodeAbbv
LEFT JOIN TableC C WITH(NOLOCK) ON A.WorkID = C.WorkID

Open in new window

0
 
didnthaveanameCommented:
I came up with the following (close to the same as COANetwork's):

select
	A.personName,
	coalesce( B.IDCodeAbbv, '' ) as IDCodeAbbv,
	coalesce( B.IDCodeName, '' ) as IDCodeName,
	coalesce( C.workID, '' ) as workID,
	coalesce( C.workLocation, '' ) as workLocation
from
	tableA as A
		left join tableB as B on A.IDCodeAbbv = B.IDCodeAbbv
		left join tableC as C on A.workID = C.workID;

Open in new window


Pretty much aesthetics, but you your sample output didn't have NULLs in it, so...
0
 
RecipeDanAuthor Commented:
Sorry about this...I did not create the database, it was handed to me.

After giviing the data a closer look. In TableA if IDCodeAbbv is not null than WorkID will not be in TableC but IDCodeAbbv will be in TableB. However, when IDCodeAbbv is not null WorkID is given a value of -1
0
 
COANetworkCommented:
it does not matter, as long as there is no corresponding WorkID = -1 in TableC.  Both mine and didnthaveaname's sampels will work - mine will produce NULL where there is no data, his will produce an empty string.  The actual values of your keys do not matter, what matters is the presence or absence of SAME values in the corresponding tables.
0
 
RecipeDanAuthor Commented:
Thank you both for your help
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now