1. 查找字段中的换行符

select * from lggzw.gzw_cent_conversation where  content like '%'||chr(13)||chr(10)||'%'

2. 查看锁表原因，并进行解锁锁定的表

2.1. ORACLE中查看当前系统中锁表情况

查询SQL如下：

--内容更丰富
select 
  s.sid,
  s.serial#,
  lock.oracle_username,
  lock.os_user_name,
  dba.object_name,
  lock.locked_mode
from v$locked_object lock, dba_objects dba, v$session s, v$process p
where dba.object_id = lock.object_id 
  and lock.session_id = s.sid
  and object_name = '表名';

--比较简洁能直接看出表名
select 
  b.owner TABLEOWNER,
  b.object_name TABLENAME,
  c.OSUSER LOCKBY,
  c.USERNAME LOGINID,
  c.sid SID,
  c.SERIAL# SERIAL
from v$locked_object a,dba_objects b, v$session c
where b.object_id = a.object_id 
AND a.SESSION_ID =c.sid;

2.2查询是什么SQL引起了锁表的原因，SQL如下：

select 
  l.session_id sid,
  s.serial#,
  l.locked_mode,
  l.oracle_username,
  s.user#,
  l.os_user_name,
  s.machine,
  s.terminal,
  a.sql_text,
  a.action
from v$sqlarea a, v$session s, v$locked_object l
where l.session_id = s.sid and s.prev_sql_addr = a.address
order by sid, s.serial#;

2.3ORACLE解锁的方法

alter system kill session 'SID,serial#';  --SID和Serial#共同确定一唯一的session。

原文链接https://www.cnblogs.com/su1643/p/6598571.html

3 oracle 中的空间计算

--1.计算面积
select 
  c.code,
  c.gridname, 
round(SDO_GEOM.SDO_AREA(c.GEOM, m.diminfo,'unit=SQ_METER')) 
from worknet_poly c, MDSYS.USER_SDO_GEOM_METADATA m 
where m.table_name = 'WORKNET_POLY' 
  and m.COLUMN_NAME = 'GEOM';

4 在plsql中导入sql文件

start    D:\aa.sql