SQL group by

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Hi guys I have the following query

"SELECT tbl_loans.loanID,tbl_Borrowers.BorrowerName FROM tbl_loans
INNER JOIN tbl_Borrowers ON tbl_loans.loanID = tbl_Borrowers.loanID"

with the following result:

loanID BorrowerName
----------- --------------------------------------------------
1 Sevak
1 Arsineh
1 Sarmen
2 Arpa
2 Garen
3 Varoosh
4 Orbel

I need to add a GROUP BY and show how many persons have the same loadID
for example:
Load ID BorrowerName
------- ------------
1 3
2 2
3 1
4 1

Posted 3-Nov-10 11:42am

Mastersev

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Comments

AspDotNetDev 3-Nov-10 19:09pm

I updated my answer to be a little more explicit.

3 solutions

Solution 2

Something like this should work

SQL

SELECT tbl_loans.loanID, Count(*) 
FROM tbl_loans
Group By tbl_loans

Posted 3-Nov-10 12:40pm

Yusuf

Solution 3

I found the solution

SELECT tbl_loans.loanID,COUNT(*) BorrowerLoanCount FROM tbl_loans
INNER JOIN tbl_Borrowers ON tbl_loans.loanID = tbl_Borrowers.loanID
GROUP BY tbl_Loans.loanID

loanID BorrowerLoanCount
----------- -----------------
1 3
2 2
3 1
4 1

Posted 3-Nov-10 13:25pm

Mastersev

Comments

Yusuf 3-Nov-10 22:49pm

why do you need the inner join when no field is accessed from the second table?

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AspDotNetDev · Accepted Answer · 2010-11-03T12:11:00

Solution 1

Group by the loan ID, then use COUNT(*) to count the number of people in that group:

SQL

SELECT
    tbl_loans.loanID, COUNT(*) AS CountInGroup
FROM tbl_loans
JOIN tbl_Borrowers
    ON tbl_loans.loanID = tbl_Borrowers.loanID
GROUP BY
    tbl_loans.loanID

Note that it does not matter which loanID you choose so long as you are consistent between your GROUP BY and SELECT.

Posted 3-Nov-10 12:11pm

AspDotNetDev

Updated 3-Nov-10 13:08pm

v2

Comments

Mastersev 3-Nov-10 18:27pm

GROUP BY tbl_Loans.loanID OR GROUP BY tbl_Borrowers.loanID???
and can you show me where to put the count(*) exactly in the script?

Nish Nishant 3-Nov-10 19:12pm

Voted 5, proposed as answer!