CREATE INDEX ISB_1_IDX ON ITEM_SUB_BALANCE (ACCOUNTBOOK_ID);

CREATE INDEX ISB_2_IDX ON ITEM_SUB_BALANCE (IS_BAK_BOOK,ITEM_ID,SUBJECT_ID,PERIOD);

CREATE INDEX ISB_3_IDX ON ITEM_SUB_BALANCE (ACCOUNTBOOK_ID,IS_BAK_BOOK,ITEM_ID,SUBJECT_ID,PERIOD);

    索引1+索引2=索引3的功能
因此索引3是多余的