mysql - Left join - how to be more efficient? -


i wrote query difficult read , im afraid efficiency might bad. can query written more efficiently in terms of matching consumerid's each table consumerdata.consumerid?

select   consumerdata.consumerid,  signupdate,  city,  state,  year(dob),  topaffiliate,  activestatus,  lastuseddate,  (select sum(achload.transactionamount) achload achload.consumerid = consumerdata.consumerid) total_ach, (select sum(billpay.transactionamount) billpay billpay.consumerid = consumerdata.consumerid) bill_pay, (select sum(recharge.transactionamount) recharge recharge.consumerid = consumerdata.consumerid) revenue, (select count(cash.consumerid) cash cash.consumerid = consumerdata.consumerid) cash__txns, (select sum(moneytransfer.transactionamount) moneytransfer moneytransfer.consumerid = consumerdata.consumerid) transfer, (select sum(moneytransfer.commissionfeeamount) moneytransfer moneytransfer.consumerid = tbl_accounts_consumerdata.consumerid) commission_fee, (select count(interchangetransactions.transactiondescription) interchangetransactions interchangetransactions.transactiondescription = "withdrawal" , interchangetransactions.consumerid = consumerdata.consumerid) withdrawals, (select count(interchangetransactions.responsecode) interchangetransactions interchangetransactions.responsecode in (01) , interchangetransactions.consumerid = consumerdata.consumerid , interchangetransactions.transactiondescription = "withdrawal") code_01, (select count(interchangetransactions.responsecode) interchangetransactions interchangetransactions.responsecode in (02) , interchangetransactions.consumerid = consumerdata.consumerid , interchangetransactions.transactiondescription = "withdrawal" ) code_02, (select count(interchangetransactions.transactiondescription) interchangetransactions interchangetransactions.transactiondescription in ("2 cash advance", "1 cash advance") , interchangetransactions.consumerid = consumerdata.consumerid) cash_advance_count, (select count(interchangetransactions.transactiondescription) interchangetransactions interchangetransactions.transactiondescription in ("balance") , interchangetransactions.consumerid = consumerdata.consumerid) inquiry_count, (select sum(interchangetransactions.transactionamount) interchangetransactions interchangetransactions.transactiontypecode = 195 , interchangetransactions.consumerid = consumerdata.consumerid)  intnl_txn_sum, (select count(interchangetransactions.transactionamount) interchangetransactions interchangetransactions.transactiontypecode = 195 , interchangetransactions.consumerid = consumerdata.consumerid)  intnl_txn_count   consumerdata  left join achload on achload.consumerid=consumerdata.consumerid  left join  billpay on billpay.consumerid = consumerdata.consumerid  left join recharge on recharge.consumerid = consumerdata.consumerid  left join cash on cash.consumerid = consumerdata.consumerid  left join moneytransfer on moneytransfer.consumerid = consumerdata.consumerid  left join interchangetransactions on interchangetransactions.consumerid = consumerdata.consumerid  consumerdata.signupdate between date(20120101) , curdate() group consumerdata.consumerid order signupdate asc;

since you're not selecting of transaction tables, simple improvement rid of left join clauses. they're not being used anything, since you're getting totals correlated subqueries. causing database create huge cross product between tables, discard when group by @ bottom.

another way join subqueries calculate grouped totals of each transaction table, instead of correlated subqueries.

select      c.consumerid, signupdate, state, year(dob), topaffiliate, activestatus, lastuseddate,     ifnull(total_ach, 0) total_ach, ifnull(bill_pay, 0) bill_pay, ifnull(revenue, 0) revenue,      ifnull(cash__txns, 0) cash__txns, ... consumerdata c left join (     select consumerid, sum(transactionamount) total_ach     achload     group consumerid) on a.consumerid = c.consumerid left join (     select consumerid, sum(transactionamount) bill_pay     billpay     group consumerid) b on b.consumerid = c.consumerid left join (     select consumerid, sum(transactionamount) revenue     recharge     group consumerid) r on r.consumerid = c.consumerid left join (     select consumerid, count(*) cash__txns     cash     group consumerid) cash on cash.consumerid = c.consumerid ... c.signupdate between date(20120101) , curdate() order signupdate asc

i'm not sure way faster -- depend on how data there in transaction tables consumers signup dates outside range specify. try both , see better.


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