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Using 4 tables

Author

Topic

alain-janquart
Starting Member

4 Posts

Posted - 2012-10-01 : 14:40:19

Hello,

I need to connect 4 tables.

Tabel 1:
P_ID, Firstname, lastname

Table 2:
P_ID, DOS_ID (P_ID can have multiple DOS_ID)

Table 3:
DOS_ID, test, test_date

Tabel 4:
DOS_ID, Payment, pay_date

I have made an sql-statement that display the dates from table 3 and table 4.Now I want to link these to the person from table 1.

Any idea how I can achieve this?

Thanks in advance

greetings

Lainkes

lazerath
Constraint Violating Yak Guru

343 Posts

Posted - 2012-10-01 : 14:55:48

Can you provide what you have so far?

sunitabeck
Master Smack Fu Yak Hacker

5155 Posts

Posted - 2012-10-01 : 14:57:28

The simple-minded way to join the tables would be as shown below - but that is probably not what you want. Is it possible that one DOS_ID have multiple tests and multiple payments? if that is the case, what do you need to get? Perhaps the number of tests done, or the total amount paid or something like that? Can you show with some sample data?

SELECT
	t1.P_ID,
	t1.FirstName,
	t1.Lastname,
	t2.P_ID,
	t2.DOS_PID,
	t3.DOS_ID,
	t3.test,
	t3.test_date,
	t4.DOS_ID,
	t4.Payment,
	t4.pay_date
FROM
	Table1 t1
	INNER JOIN Table2 t2 ON t1.P_ID=t2.P_ID
	LEFT JOIN Table3 t3 ON t3.DOS_ID=t2.DOS_ID
	LEFT JOIN Table4 t4 ON t4.DOS_ID = t2.DOS_ID;

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-10-01 : 15:00:35

in any case posting some sample data and explaining your output will make it clear for us on what exactly you're looking at!

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

alain-janquart
Starting Member

4 Posts

Posted - 2012-10-01 : 15:03:12

Every P_ID can have multiple DOS_ID's.
But one DOS_ID has only one record in table 3 and table 4.

What I have now is a list with following fields :
DOS_ID, test_date, pay_date, difference between those 2 days.

And I want :
Lastname, Firstname, DOS_ID, test_date, pay_date, difference between those 2 days.

Thanks

Lainkes

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-10-01 : 15:05:32

quote:
Originally posted by alain-janquart

Every P_ID can have multiple DOS_ID's.
But one DOS_ID has only one record in table 3 and table 4.

What I have now is a list with following fields :
DOS_ID, test_date, pay_date, difference between those 2 days.

And I want :
Lastname, Firstname, DOS_ID, test_date, pay_date, difference between those 2 days.

Thanks

Lainkes

so for each P_ID whats rule for determining which DOS_ID to be returned? By default if you link using DOS_ID you will get mutiple records per PID. so you need to determine rule to fetch single DOS_ID per P_ID ie like earliest one, latest one,random one etc.

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

alain-janquart
Starting Member

4 Posts

Posted - 2012-10-01 : 15:10:17

I want to view all records, even if there are different ones for a P_ID

If P_ID with value 50 and name 'John Doe' has 3 DOS_ID's, then I want 3 rows like :
Doe, John, 50, test_date, pay_date, difference between those 2 days.
Doe, John, 50, test_date, pay_date, difference between those 2 days.
Doe, John, 50, test_date, pay_date, difference between those 2 days.

I hope I explain correctly what i want.

Greetings

Lainkes

sunitabeck
Master Smack Fu Yak Hacker

5155 Posts

Posted - 2012-10-01 : 15:24:55

[code]SELECT
t1.Lastname,
t1.FirstName,
t2.DOS_PID,
t3.test_date,
t4.pay_date,
DATEDIFF(dd,t3.test_date, t4.pay_date) AS Days
FROM
Table1 t1
INNER JOIN Table2 t2 ON t1.P_ID=t2.P_ID
INNER JOIN Table3 t3 ON t3.DOS_ID=t2.DOS_ID
INNER JOIN Table4 t4 ON t4.DOS_ID = t2.DOS_ID;[/code]

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-10-01 : 15:28:25

quote:
Originally posted by alain-janquart

I want to view all records, even if there are different ones for a P_ID

If P_ID with value 50 and name 'John Doe' has 3 DOS_ID's, then I want 3 rows like :
Doe, John, 50, test_date, pay_date, difference between those 2 days.
Doe, John, 50, test_date, pay_date, difference between those 2 days.
Doe, John, 50, test_date, pay_date, difference between those 2 days.

I hope I explain correctly what i want.

Greetings

Lainkes

then Sunita's suggestion should work


SELECT
	t1.P_ID,
	t1.FirstName,
	t1.Lastname,
	t2.P_ID,
	t2.DOS_PID,
	t3.DOS_ID,
	t3.test,
	t3.test_date,
	t4.DOS_ID,
	t4.Payment,
	t4.pay_date,
        DATEDIFF(t3.test_date,t4.pay_date) AS TimeDiff
FROM
	Table1 t1
	INNER JOIN Table2 t2 ON t1.P_ID=t2.P_ID
	LEFT JOIN Table3 t3 ON t3.DOS_ID=t2.DOS_ID
	LEFT JOIN Table4 t4 ON t4.DOS_ID = t2.DOS_ID;

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

alain-janquart
Starting Member

4 Posts

Posted - 2012-10-01 : 15:34:57

Thanks,

This seems to work.
Never had such a quick answer on whatever forum.
And a correct answer :-)

Thank you very much

Lainkes

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-10-01 : 16:09:00

welcome

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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