这个存储过程错在哪里了？

[JJY1981]

1 create or replace procedure ci
2 as
3 n_cust_id snap_cust_info.cust_id%TYPE;
4 begin
5 select cust_id into n_cust_id from snap_cust_info where input_date = to_char(sysdate,'yyyymmdd');
6 if nvl(n_cust_id,123) then
7 insert into tb_cust_prem_info select poh_cust_id,insan_amt from snap_policy_info where poh_cust_id=n_cust_id;
8 end ci;
------------------------------------------------------------------------
报错是：
LINE/COL ERROR
-------- -----------------------------------------------------------------
8/5 PLS-00103: Encountered the symbol "CI" when expecting one of the
following:
if

[bzszp]

if isnull(n_cust_id) then//是不是判断是否为空？
insert into tb_cust_prem_info select poh_cust_id,insan_amt from snap_policy_info where poh_cust_id=n_cust_id;
end if;
end ci;

[zlqs]

if nvl(n_cust_id,123) then


这句有问题

[zlqs]

换为
if n_cust_id=null then

[JJY1981]

if nvl(n_cust_id,123) then //这句就是判断是不是为空，不为空的话执行下面语句

就是我要表达 if n_cust_id!=Null then
……
不知道pl/sql怎么表达

[zlqs]

if n_cust_id<>null then
insert into tb_cust_prem_info select poh_cust_id,insan_amt from snap_policy_info where poh_cust_id=n_cust_id;
end if

[qyflaoda]

if (n_cust_id is null) then

[LGQDUCKY]

就是我要表达 if n_cust_id!=Null then
……
不知道pl/sql怎么表达

if n_cust_id is not null then 这样判断！