问题：有如下的sql性能差：

select rowid,pkg_life_query_func.f_get_deposit_account_value(deposit_id,account_code) as account_value,pkg_life_query_func.f_get_deposit_account_value(deposit_id,account_code) as account_value,a.* from v_cust_deposit_list a where ( account_code='27902')

v_cust_deposit_list 是一个视图如下：

create or replace view v_cust_deposit_list as

select row_number() over(order by tcdl.account_code,

trunc(tcdl.deposit_date), to_number(decode(tcd.distri_type,

'1', 1, '2', 5, '3', decode(tpf.fee_type, 169, 2, 69, 6),

'10', 3, '71', 4, '8', 9, 8))) rn,tcdl.*

from t_cust_deposit_list tcdl,

t_capital_distribute tcd,

t_product_fee tpf

where tcdl.capital_id = tcd.capital_id(+)

and tcd.prem_id = tpf.list_id(+)

order by tcdl.account_code,

trunc(tcdl.deposit_date),

to_number(decode(tcd.distri_type,'1',1,'2',5,'3',

decode(tpf.fee_type, 169, 2, 69, 6),'10',3,'71',4,'8',9,8));

在t_cust_deposit_list有account_code;

原因：由于在视图上含有row_number分析函数，所以没法走索引：把语句改为：

select rowid,

pkg_life_query_func.f_get_deposit_account_value(deposit_id,account_code) as account_value,

pkg_life_query_func.f_get_deposit_account_value(deposit_id,account_code) as account_value,

a.*

from (

select row_number() over (order by tcdl.account_code,trunc(tcdl.deposit_date),to_number(decode(tcd.distri_type,'1',1,'3',decode(tpf.fee_type,169,2,69,5),'10',3,'71',4,'2',9,8))) rn,tcdl.*

from

(select tcd2.* from t_cust_deposit_list tcd2

where tcd2.account_code='27902') tcdl,t_capital_distribute tcd,t_product_fee tpf

where tcdl.capital_id = tcd.capital_id(+) and tcd.prem_id = tpf.list_id(+)

order by tcdl.account_code,trunc(tcdl.deposit_date),to_number(decode(tcd.distri_type,'1',1,'3',decode(tpf.fee_type,169,2,69,5),'10',3,'71',4,'2',9,8))

) a