递归查询部门

select * from table start with id= ? connect by prior id = parent_id;//查询id的子部门（包 括id自身）
    select * from table start with id= ? connect by prior parent_id= id;//查询id的父部门（包括id自身）

copy表

create table tableName as select * from tableName;//copy表

设置百分点

concat(to_char(count(distinct l.person_id) /
                              count(l.person_id) * 100,
                              ‘990.99‘),
                      ‘%‘) baifen

for循环执行SQL语句

declare
    begin
    for i in 1..100
    loop
    dbms_output.put_line(‘sql语句‘||i);
    end loop;
    end;

oracle查询已锁住的表

SELECT
	OBJECT_NAME,
	SESSION_ID SID,
	MACHINE,
	VS.MODULE,
	‘ALTER SYSTEM KILL SESSION ‘‘‘ || SESSION_ID || ‘, ‘ || SERIAL#|| ‘‘‘; ‘ KILL_SESSION,
	VS.STATUS,
	VS.ACTION,
	SERIAL#,
	ORACLE_USERNAME,
	OS_USER_NAME
FROM
	V$LOCKED_OBJECT VO,
	V$SESSION VS,
	ALL_OBJECTS AO
WHERE
	VO.SESSION_ID = VS.SID
	AND AO.OBJECT_ID = VO.OBJECT_ID
	AND NVL(VS.ACTION, ‘ ‘) <> ‘Service Management ‘
ORDER BY
	OBJECT_NAME,
	MACHINE,
	VS.MODULE;

其中KILL_SESSION为对应解锁的SQL，需要具有权限才能执行