sql - Mysql Join three tables with a WHERE on the third -


i have 3 tables need join show following.
can join first 2 , show unique nominal_acc_no's query 

select nominal_acc_no,coa_name (     select nominal_acc_no ,coa_name acc_chart_of_accounts     union     select nominal_acc_no,coa_name acc_chart_of_sub_accounts ) a;

but i'm struggling how join third , output results shown below. need group on nominal_acc_no , sum debit & credit on company_id in acc_posting_details table. , appreciated.

 acc_chart_of_accounts            coa_id   nominal_acc_no      1           10        2           20          acc_chart_of_sub_accounts coa_sub_id    nominal_acc_no  company_id       1             10                 1       2             20                 1       3             110                1    acc_posting_details id         nominal_acc_no   debit    credit  company_id 1              10           25.00                1 2              10           15.00                1 3              20                    30.00       1 4              110          10.00                1 5              110           8.00                1  result nominal_acc_no        debit       credit    company_id 10                    40.00         -           1 20                      -         30.00         1 110                   18.00         -           1 

select   acsa.nominal_acc_no,   ifnull(sum(apd.debit),0) debit,   ifnull(sum(apd.credit),0) credit,   acsa.company_id acc_chart_of_sub_accounts acsa   left join acc_posting_details apd     on acsa.nominal_acc_no = apd.nominal_acc_no group acsa.nominal_acc_no, acsa.company_id

output

nominal_acc_no        debit     credit    company_id ----------------------------------------------------- 10                    40.00     0           1 20                    0         30.00       1 110                   18.00     0           1

edit : there alias problem have fixed in query.

sql fiddle demo here


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