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mysql for select using sum in another table

P: 45
guys, please help

i need balance amount of fees all students has to pay. Following is the DB structure. `feepayid` is primary key for paymentstable and paymentregister & `studentid` is primary in studentstable. I have written a query for this, please evaluate the query.

please see the attachment for the db structure


Expand|Select|Wrap|Line Numbers
  1. SELECT d.`studentid`, SUM(a.`totalfee` - (SELECT SUM(`feeamount`) FROM `paymentstable`  WHERE a.`feepayid` = `feepayid`)) AS balancefee
  2. FROM `studentstable` d
  3. LEFT JOIN `paymentregister` a ON a.`studentid` = d.`studentid`
  4. GROUP BY d.`studentid`;
  5.  
  6.  
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Mar 8 '12 #1
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Explain the business rules a bit more. Which table contains the amounts that students are supposed to pay and which one contains the amounts that students actually paid?
Mar 8 '12 #2

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