oracle判断语句怎么写 _语句

1. oracle中判断语句怎么写是存储过程里面的 IF/ELSE ？还是简单的 DECODE ?
SQL> DECLARE
2 testvalue INT;
3 BEGIN
4 testvalue := 100;
5
6 IF testvalue > 100 THEN
7 dbms_output.put_line( '100+' );
8 ELSIF testvalue = http://www.xuexi88.com/zhishi/100 THEN
9 dbms_output.put_line( '100' );
【oracle判断语句怎么写】10 ELSE
11 dbms_output.put_line( '100-' );
12 END IF;
13
14 END;
15 /
100
PL/SQL procedure successfully completed.
SQL> SELECT
2 DECODE(GROUPING(sale_item), 1, 'ALL', sale_item) AS iten,
3 SUM(sale_money) AS money
4 FROM
5 sale_report
6 GROUP BY
7 ROLLUP(sale_item);
ITEN MONEY
------ ----------
A 733285
B 2382
C 5738
ALL 741405
2. oracle查询语句条件判断怎么写一个多条件判断的sql:
select
oper.opid,
oper.user_name,
oper.user_host,
case
when oper.oper_type = 1 then 'System Manager'
when oper.oper_type = 2 then 'USER Manager'
end case,
case
when oper.oper_object_type = 1 then 'User'
when oper.oper_object_type = 2 then 'Role'
when oper.oper_object_type = 3 then 'Broker'
when oper.oper_object_type = 4 then 'QM Manager'
when oper.oper_object_type = 5 then 'User Group'
when oper.oper_object_type = 6 then 'Msg Flow'
when oper.oper_object_type = 7 then 'Queue'
end case
from esb_log_user_oper oper;
3. oracle数据库条件判断的查询语句怎么写建表，测试数据：
create table test
（收款标志 int）
insert into test values (1);
insert into test values (1);
insert into test values (1);
commit；执行：
select case
when a.cnt = b.cnt then
'未收款'
when a.cnt = d.cnt then
'已收款'
when c.cnt 0 then
'部分收款'
end 收款状态
from (select count(*) cnt from test) a,
(select count(*) cnt from test where 收款标志 = 1) b,
(select count(*) cnt from test where 收款标志 = 2) c,
(select count(*) cnt from test where 收款标志 = 3) d结果：
然后你自己换点其他数据测试一下吧，思路就这么个思路了。
4. oracle中能否写判断语句如果是select查询做显示的话select code, name, case when length(code) =3 then 1 when length(code)=6 then 2 when length(code)=9 then 3 end id from table；如果是要插入的话 update table set id =( case when length(code) =3 then 1 when length(code)=6 then 2 when length(code)=9 then 3 end) 。