create index atd_idx1 on attendance(member_seq);
create index rci_idx1 on receipt_item(receipt_seq);
create index voi_idx1 on voucher_item(ac_doc_seq);
create index mgm_idx1 on member_group_member(member_seq);
create index acb_idx1 on ac_balance(ac_month_seq);
create index acl_idx1 on ac_ledger(ac_month_seq);