Oracle定义事务的SQL语句

Question

如题所述

Answer 1

以oracle自带的scott为例：
1、select
t1.ename,t2.ename
as
mgrname,d.dname
from
scott.emp
t1,scott.emp
t2,scott.dept
d
where
t1.mgr=t2.empno
and
t2.deptno=d.deptno
2、select
d.*
from
scott.dept
d,(select
rownum
n,
tt.*
from
(select
count(*)
c,deptno
from
scott.emp
group
by
deptno
order
by
c
desc)
tt)t
where
t.n=1
and
t.deptno=d.deptno
3、select
*
from(select
t.*,dense_rank()over
(partition
by
deptno
order
by
sal)
r
from
scott.emp
t
where
deptno=30)
where
r<=3
4、select
*
from(select
t.*,rank()over
(partition
by
n
order
by
sal)
r
from
(select
''
as
n,tt.*
from
scott.emp
tt)
t)
where
r
between
5
and
10

Answer 2

SQL>
select
*
from
test_main;
ID
VALUE
----------
--------------------
2
TWO
3
THREE
1
ONE
SQL>
BEGIN
2
--
插入2条同样的数据，使主键重复，引发错误后回滚事务.
3
INSERT
INTO
test_main(id,
value)
VALUES
(4,
'FOUR');
4
INSERT
INTO
test_main(id,
value)
VALUES
(4,
'FOUR');
5
COMMIT;
6
EXCEPTION
7
WHEN
OTHERS
THEN
8
dbms_output.put_line('Error
Code
=
'
||
TO_CHAR(SQLCODE)
);
9
dbms_output.put_line('Error
Message
=
'
||
SQLERRM
);
10
--
回滚事务
11
ROLLBACK;
12
END;
13
/
PL/SQL
procedure
successfully
completed.
SQL>
select
*
from
test_main;
ID
VALUE
----------
--------------------
2
TWO
3
THREE
1
ONE
SQL>