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Joining data from two tables to another Expand / Collapse
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Posted Monday, August 12, 2013 12:55 PM
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Last Login: Saturday, January 4, 2014 3:59 PM
Points: 2, Visits: 12
Hi All;

. I am testing some code with temporary tables. I have let’s say table 1 which I will call “mother table”. Here what it looks like.

ID Letter Data1
1 A 23
2 B 24
3 C 25
4 D 12
5 E 14
6 F 10
7 G 12

I am trying to join data from two tables which I will call “child1” and “child2” to the mother table on matches from letter column to have something like this.

ID Letter Data1 LetterC DataC
1 A 23 A 123
2 B 24 B 124
3 C 25 C 125
4 D 12 D 127
5 E 14 E 128
6 F 10 F 129
7 G 12 G 130

Here is “Child1” and “Child2” respectively

ID Letter DataC2
1 D 127
2 E 128
3 F 129
4 G 130

ID Letter DataC1
1 A 123
2 B 124
3 C 125

I have tried for one hour to come up with some code, but it seems that I am only able to get only data from one table joined to the mother table with the following query. I’m stuck and was wondering if any suggestion or code for a poor soul like me. Here is what I have so far. thanks

USE TEMPDB
IF exists (SELECT * FROM Mother AS M inner join dbo.cHILD1 AS C1 ON M.Letter = C1.LETTER)
begin
SELECT M.LETTER, C1.LETTER, M.DATA1, C1.DATAC1 FROM Mother as M
inner join child1 as c1 on c1.letter = m.Letter
end
else
begin
select M.Letter , C2.Letter, M.data1, C2.DataC2 from Mother as m
inner join child2 as c2 on c2.letter = m.Letter
end

Post #1483428
Posted Monday, August 12, 2013 1:16 PM
Old Hand

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Group: General Forum Members
Last Login: Yesterday @ 6:00 PM
Points: 346, Visits: 1,389
Try this code and see if it works for you:

select m.id, m.letter, m.data1, coalesce(c1.letter, c2.letter), coalesce(c1.data1, c2.data1)
from @Mother m
left join @child1 c1 on c1.letter = m.Letter
left join @child2 c2 on c2.letter = m.Letter

NOTE: You may have to change some of the table names to match your tables.

Also, for future posts, it would be nice if you could post your DDL and Insert statements like this:

declare @Mother table
(
ID int,
Letter char(1),
data1 int
)

insert @Mother (id, letter, data1) values
(1, 'A', 23)
,(2, 'B', 24)
,(3, 'C', 25)
,(4, 'D', 12)
,(5, 'E', 14)
,(6, 'F', 10)
,(7, 'G', 12)

declare @child1 table
(
ID int,
Letter char(1),
data1 int
)
insert @child1 (ID, Letter, data1) values
(1, 'A', 123)
,(2, 'B', 124)
,(3, 'C', 125)


declare @child2 table
(
ID int,
Letter char(1),
data1 int
)
insert @child2 (ID, Letter, data1) values
(1, 'D', 127)
,(2, 'E', 128)
,(3, 'F', 129)
,(4, 'G', 130)

It makes it so much easier and faster to come up with a possible solution.


__________________________________________________________________________________________________________
How to Post to get the most: http://www.sqlservercentral.com/articles/Best+Practices/61537/
Post #1483439
Posted Monday, August 12, 2013 1:28 PM
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Last Login: Saturday, January 4, 2014 3:59 PM
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Hi;

That did it! thanks for the speedy response and for the heads up for the post format.

Cheers,
Post #1483446
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