How Do I Inner Join With First Table(Result Of Some Conditions ) In A Union With Second Table

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i have two table FoodList and AlternateFoodList . I want All Food and Alternate Food For a person in an appointment

Appointment

AID	Date
1	1-1-2013
2	2-1-2014

FoodLsit

FoodAptID	AID	FoodID	QTY
1	1	1	1
2	1	2	2

AlternateFoodList

FoodAlternateID	FoodAptID	FoodID	QTY
1	1	3	1
2	1	5	2

requiredResult is

FoodAlternateID	FoodAptID	AID	FoodID	QTY	A_F
	1	1	1	1	F
1	1	1	3	1	A
2	1	1	5	1	A

i tried query like this

SQL

 select null as 'FoodAlternateID',P. *,"F" as A_F from  FoodAptID P inner join Appointment A on A.AID=P.AID where A.Date ='1-1-2013'
union
(some query where i able to use A.Date ='1-1-2013' in sub table )

PLZ help

Posted 7-Jan-14 19:18pm

rajin kp

Updated 7-Jan-14 19:50pm

Maciej Los

v5

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Maciej Los 8-Jan-14 1:55am

Please, be more specific and provide more details.

rajin kp 8-Jan-14 2:03am

Need All Data from Tables with appointment date 1-1-2013 see result table .problem is that i didnt add AID in subtable insted it contain FoodAptID and Table FoodLsit has AID . Is this possible to use result we get before Union to use inside query after union .ie
(select null as 'FoodAlternateID',P. *,"F" as A_F from FoodAptID P inner join Appointment A on A.AID=P.AID where A.Date ='1-1-2013') as TT
union
(some query where i can USe TT to join with AlternateFoodList so that only reuired row come in here )

Maciej Los 8-Jan-14 2:07am

You don't need to add AID into several tables. You need to know the relationships between tables. And based on these relationships, you will be able to get proper data.

Maciej Los 8-Jan-14 2:09am

Please, provide more details about FoodAptID table.

rajin kp 8-Jan-14 3:51am

FoodAptID is PK for FoodLsit and FK for AlternateFoodList

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Maciej Los · Answer 1 · 2014-01-07T22:22:00

Sorry, but your question is not clear still.

Have a look at example:

SQL

DECLARE @Appointment TABLE (AID INT IDENTITY(1,1),  [Date] DATETIME)
INSERT INTO @Appointment ([Date])
VALUES ('2013-01-01'), ('2014-01-02')

DECLARE @FoodLsit TABLE (FoodAptID INT IDENTITY(1,1), AID INT, FoodID INT, QTY INT)
INSERT INTO @FoodLsit (AID, FoodID, QTY)
VALUES(1, 1, 1), (1, 2, 2)

DECLARE @AlternateFoodList TABLE (FoodAlternateID   INT IDENTITY(1,1), FoodAptID INT, FoodID INT, QTY INT)
INSERT INTO @AlternateFoodList (FoodAptID, FoodID, QTY)
VALUES(1, 3, 1), (1, 5, 2)


SELECT AFL.FoodAlternateID , FL.FoodAptID, AFL.FoodID, FL.QTY , A.AID, A.Date
FROM @AlternateFoodList AS AFL INNER JOIN @FoodLsit AS FL ON AFL.FoodAptID = FL.FoodAptID INNER JOIN @Appointment AS A ON FL.AID = A.AID
WHERE A.Date = '2013-01-01'

For further information about JOIN's, please see: Visual Representation of SQL Joins[^]