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Editorial Team
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Asked: 2026-06-16T00:15:58+00:00

I have this query that return to me all rows for one user $strSQL

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I have this query that return to me all rows for one user 

$strSQL = "SELECT * FROM customer , bills , vouchers
WHERE 
bills.bills_CustomerName = customer.customer_Name and
vouchers.vouchers_CustomerName = customer.customer_Name and
bills.bills_CustomerName like '%".$_POST["MyName"]."%'
";

I have the problem that one row are repeated 2 times, the customer table is related to the bills table and to the vouchers table on one FK column.

bills table :

bills_ID  - bills_CustomerName - bills_Total

customer table :

customer_ID - customer_Name - customer_Tell

vouchers table :

vouchers_ID - vouchers_CustomerName - vouchers_Total

we are get 

Name       Total    Tell 

kam johin   100      0444444444
kam johin   100      0444444444
mak pop    200      0588888888
mak pop    200      0588888888
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1 Answer

  1. Editorial Team

    If customer to bill is one-to-many and customer to voucher is also one-to-many then you have what is sometimes known as a “chasm trap”, and you will have to aggregate child values from bill and voucher before joining to customer.

    Or perhaps your data model should be more like:- Customer->Bill->Voucher, in which case you need to include in the voucher table a foreign key to the Bill to which the voucher relates.

    BTW you could probably use some surrogate key for customer – what happens when two different customers have the same name?

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