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# 表操作

# sequence 和表默认值

创建基于类型 sequence 默认值的表

create sequence seq_person_id
minvalue 1
maxvalue 999999999999999999
start with 1
increment by 1;
create table person(
person_id number default seq_person_id.nextval,
person_name varchar2(20) default '');
# 基本查询
# to_char
select to_char(sysdate,'DD-MON-YYYY') from dual;
select to_char(sysdate,'MM-DD-YYYY') from dual;
select to_char(sysdate,'yyyy-mm-dd HH:mm:ss') from dual;
# ||字符串连接
select Rtrim(t.vend_name) || '----' || Rtrim(t.vend_city) || '----' || Rtrim(t.vend_country)  from VENDORS t
# 连接查询
select ( select count(1) from vendors) vendors_all,
         ( select count(1) from products) products_all
from dual;
vendors_allproducts_all
614
# 笛卡尔积(交叉连接) :A 表和 B 表连接查询，无查询条件
select v.vend_id,v.vend_name, p.vend_id, p.prod_id,p.prod_name  from vendors v,products p
-- 查询结果工 84 条记录
select v.vend_id, v.vend_name, p.vend_id, p.prod_name from vendors v, products p
 where v.vend_id = p.vend_id
# 内连接(等值连接)
select v.vend_id, v.vend_name, p.vend_id, p.prod_name
  from vendors v inner join  products p
 on v.vend_id = p.vend_id
# 自连接
-- 查询产品 Id 为 DTNTR 的供应商的所有产品
select p2.prod_id, p2.prod_name
  from products p1, products p2
 where p1.vend_id = p2.vend_id
   and p1.prod_id = 'DTNTR'   
   
select p2.prod_id, p2.prod_name
  from products p1
 inner join products p2
    on p1.vend_id = p2.vend_id
 where p1.prod_id = 'DTNTR'
# 左连接
-- 内连接：查询顾客的订单数量
select cus.cust_id, cus.cust_name, ord.order_num
  from customers cus
 inner join orders ord
    on cus.cust_id = ord.cust_id
 order by cus.cust_id
 
 -- 左连接：查询所有游客的订单，如果没有订单，则 order_num 为 nulll
 select cus.cust_id, cus.cust_name, ord.order_num
  from customers cus
  left join orders ord
    on cus.cust_id = ord.cust_id
 order by cus.cust_id
# UNION组合查询
-- union 可消除重复行
select vend_id, prod_id,prod_name,prod_price from products where vend_id in (1001,1002)
union 
select vend_id,prod_id,prod_name,prod_price from products where prod_price<5
idvend_idprod_idprod_nameprod_price
11001ANV01.5 ton anvil5.99
21001ANV021 ton anvil9.99
31001ANV032 ton anvil14.99
41002FU1Fuses3.42
51002OL1Oil can8.99
61003FCCarrots2.5
71003SLINGSling4.49
81003TNT1TNT (1 stick)2.5
-- union all 不会去重
select vend_id, prod_id,prod_name,prod_price from products where vend_id in (1001,1002)
union all
select vend_id,prod_id,prod_name,prod_price from products where prod_price<5
idvend_idprod_idprod_nameprod_price
11001ANV01.5 ton anvil5.99
21001ANV021 ton anvil9.99
31001ANV032 ton anvil14.99
41002OL1Oil can8.99
51002FU1Fuses3.42
61002FU1Fuses3.42
71003SLINGSling4.49
81003TNT1TNT (1 stick)2.5
91003FCCarrots2.5
# listagg
SELECT A.ENTERPRISE_ID  ,
                B.LOGON_ID  
                FROM EPAN_ENT_USER_RELATION_REQ  A
                JOIN EPAN_ENT_USER B ON A.ENTERPRISE_ID=B.ENTERPRISE_ID
        WHERE A.STATUS = 'Confirm' 
        AND A.ENTERPRISE_ID < 122
        ORDER BY A.ENTERPRISE_ID
ENTERPRISE_IDLOGON_ID
111zhaoliiu1
112wagnwu2
112zhaoliiu7
114zhaoliiu6
115zhaoliiu5
115zhaoliiu5
select users.ENTERPRISE_ID,listagg(users.LOGON_ID,',')within group(order by users.ENTERPRISE_ID) LOGON_IDS  from   
( 
        SELECT A.ENTERPRISE_ID  ,
                B.LOGON_ID  
                FROM EPAN_ENT_USER_RELATION_REQ  A
                JOIN EPAN_ENT_USER B ON A.ENTERPRISE_ID=B.ENTERPRISE_ID
        WHERE A.STATUS = 'Confirm' 
        AND A.ENTERPRISE_ID < 122
        ORDER BY A.ENTERPRISE_ID
) users group by users.ENTERPRISE_ID
ENTERPRISE_IDLOGON_IDS
111zhaoliiu1
112wagnwu2,zhaoliiu7
114zhaoliiu6
115zhaoliiu5,zhaoliiu5
# 用户管理
select * from all_users
select * from dba_users
select username,sid,serial# from v$session ;
alter system kill session '4,13' 
drop user C##HURUIYI cascade;
create user c##huruiyi identified by huruiyi;
grant dba to c##huruiyi;
revoke UPDATE ANY TABLE from "C##HURUIYI" container=ALL;
revoke CREATE TABLE from "C##HURUIYI" container=ALL;
revoke BACKUP ANY TABLE from "C##HURUIYI" container=ALL;
grant CREATE TABLE to "C##HURUIYI" container=ALL;
grant BACKUP ANY TABLE to "C##HURUIYI" container=ALL;
grant UPDATE ANY TABLE to "C##HURUIYI" container=ALL;
drop user "C##TEST" cascade;
很多时候我们用拥有DBA权限的用户 从oracle数据库导出数据，那么再导入新的数据库时就还得需要DBA权限的用户，下面是如何创建一个新用户并授予DBA权限命令。
1.用有dba权限的用户登录：sys用户
2.创建一个新用户：create user abc identified by 123456;
3.授予DBA权限： grant connect,resource,dba to abc;
ok,创建好了，就可以用abc这个用户登录了，abc用户拥有dba权限。
select * from dba_users; 查看数据库里面所有用户，前提是你是有dba权限的帐号，如sys,system
select * from all_users; 查看你能管理的所有用户！
select * from user_users; 查看当前用户信息 ！
原文地址:https://blog.csdn.net/u012630060/article/
# 函数
create or replace function func_join_strs(str1 varchar2, str2 varchar2)
  return varchar2 IS
begin
  return str1 || '-' || str2;
end;
select func_join_strs('A', 'B') from dual;
-- 会话级别的变量
variable session_var varchar2(50);
call  func_join_strs('A','B') into :session_var;
select :session_var sv from dual;
# 常用函数
# 版本查看
select * from v$version;

select * from product_component_version;

select * from v$instance

# 触发器
# 触发器动作
  • Alter
  • Create
  • Drop
  • Delete
  • Insert
  • Update
# 特殊触发器
​	Oracle 还支持服务器启动和关闭，用户登录和注销上的触发器
# 创建触发器的必要信息
  • 唯一的触发器名称
  • 触发器关联的表
  • 触发器响应的动作 (Insert,Update 或 Delete)
  • 何时执行触发器 (响应动作前或后)
# 触发器 - Before-Insert (模拟自增主键)
create table test
(
  id    number not null,
  name  nvarchar2(10) default '' not null,
  isvip char(1)
)
;
comment on column test.name  is '用户名';
  
create sequence SEQ_HURUIYI_TEST
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
nocache;
 
select * from all_sequences where sequence_owner='C##HURUIYI'
create or replace trigger TEST_HURUIYI_TRIGGER
  before insert on TEST
  for each row
  when (new.id is null)
begin
  select SEQ_HURUIYI_TEST.nextval into :NEW.ID from dual;
end;
 
select * from user_triggers where trigger_name='TEST_HURUIYI_TRIGGER'
# 触发器 - After-Insert
  • 创建表
  • create table orders_log(
      changed_on timestamp not null,
      changed_type char(1) not null,
      order_num int not null
    );
  • 创建存储过程
  • create or replace trigger orders_after_insert
  after insert on orders
  for each row
begin
  insert into orders_log
    (changed_on, changed_type, order_num)
  values
    (sysdate, 'A', :new.order_num);
end;

  • 插入数据
  • insert into orders
      (order_num, order_date, cust_id)
    values
      (50040, sysdate, 10001);
  • 查询执行结果
  • select * from orders_log;
# 触发器 - Before-Delete
create or replace trigger orders_before_delete
  before delete on orders
  for each row
begin
  insert into orders_log
    (changed_on, changed_type, order_num)
  values
    (sysdate, 'D', :old.order_num);
end;
create or replace trigger orders_before_delete
  before delete on orders
  for each row
begin
	-- 删除订单时，插入日志
  insert into orders_log
    (changed_on, changed_type, order_num)
  values
    (sysdate, 'D', :old.order_num);
    -- 删除订单的时候，要存档
  insert into orders_archive
    (order_num, order_date, cust_id)
  values
    (:old.order_num, :old.order_date, :old.cust_id);
end;
delete orders where order_num='50040'
select * from orders_log

# 存储过程
create or replace procedure Proc_Hello IS
begin
  Dbms_Output.put_line('Hello World');
end;
create or replace procedure PROC_TEST Is
  h number;
  g varchar2(50);
begin
  select extract(hour from current_timestamp) into h from dual;
  if h >= 20 or h <= 5 then
    g := '休息时间';
  elsif h > 5 and h <= 12 then
    g := '上午好';
  elsif h > 12 and h <= 17 then
    g := '下午好';
  else
    g := '晚上好 ';
  end if;
  DBMS_OUTPUT.PUT_LINE(g);
end;
create or replace procedure PROC_TEST(h in number, g out varchar2) as
begin
  if h >= 20 or h <= 5 then
    g := '休息时间';
  elsif h > 5 and h <= 12 then
    g := '上午好';
  elsif h > 12 and h <= 17 then
    g := '下午好';
  else
    g := '晚上好 ';
  end if;
end;
# 有参存储过程
create 
	or replace procedure PROC_ADD (
	v_cust_name in customers.cust_name % type,
	v_cust_address in customers.cust_address % type,
	v_cust_city in customers.cust_city % type,
	v_cust_state in customers.cust_state % type,
	v_cust_zip in customers.cust_zip % type,
	v_cust_country in customers.cust_country % type,
	v_cust_contact in customers.cust_contact % type,
	v_cust_email in customers.cust_email % type 
	) IS v_cust_id number;
begin
select
	max( cust_id ) into v_cust_id 
from
	customers;
v_cust_id := v_cust_id + 1;
insert into customers ( cust_id, cust_name, cust_address, cust_city, cust_state, cust_zip, cust_country, cust_contact, cust_email )
values
	( v_cust_id, v_cust_name, v_cust_address, v_cust_city, v_cust_state, v_cust_zip, v_cust_country, v_cust_contact, v_cust_email );
commit;
end;
执行存储过程
begin
	proc_add (
	v_cust_name => 'HuRuiyi',
	v_cust_address => 'ShangHai',
	v_cust_city => 'YangPu',
	v_cust_state => 'CH',
	v_cust_zip => '231000',
	v_cust_country => 'China',
	v_cust_contact => 'ZiHuaXinYuan',
	v_cust_email => '807776962@qq.com' 
	);
commit;
end;
                 
begin
	proc_add ( 'HuRuiyi', 'ShangHai', 'YangPu', 'CH', '231000', 'China', 'ZiHuaXinYuan', '807776962@qq.com' );
commit;
end;
# 游标
基本的游标应用
declare
  -- 变量声明 --
  v_vend_id      vendors.vend_id%type;
  v_vend_name    vendors.vend_name%type;
  v_vend_address vendors.vend_address%type;
  v_vend_city    vendors.vend_city%type;
  v_vend_state   vendors.vend_state%type;
  v_vend_zip     vendors.vend_zip%type;
  v_vend_country vendors.vend_country%type;
  -- 变量声明 --
  cursor cr_test is
    select vend_id,
           vend_name,
           vend_address,
           vend_city,
           vend_state,
           vend_zip,
           vend_country
      from vendors;
begin
  open cr_test;
  loop
    fetch cr_test
      into v_vend_id,
           v_vend_name,
           v_vend_address,
           v_vend_city,
           v_vend_state,
           v_vend_zip,
           v_vend_country;
    exit when cr_test%notfound;
  end loop;
  close cr_test;
end;
游标应用-循环更新 - 批量更新 vend_country = USA 的值为 China
declare
  -- 变量声明 --
  v_vend_id      vendors.vend_id%type;
  v_vend_name    vendors.vend_name%type;
  v_vend_address vendors.vend_address%type;
  v_vend_city    vendors.vend_city%type;
  v_vend_state   vendors.vend_state%type;
  v_vend_zip     vendors.vend_zip%type;
  v_vend_country vendors.vend_country%type;
  -- 变量声明 --
  cursor cr_test is
    select vend_id,
           vend_name,
           vend_address,
           vend_city,
           vend_state,
           vend_zip,
           vend_country
      from vendors;
begin
  open cr_test;
  loop
    fetch cr_test
      into v_vend_id,
           v_vend_name,
           v_vend_address,
           v_vend_city,
           v_vend_state,
           v_vend_zip,
           v_vend_country;
    update vendors
       set vend_country = 'China'
     where vend_id = v_vend_id
       and rtrim(v_vend_country) = 'USA';
    exit when cr_test%notfound;
  end loop;
  close cr_test;
end;
# 表复制
表结构复制
create table  vendors_test as select * from vendors where 1=2;
数据导入
insert into vendors_test ( vend_id, vend_name, vend_address, vend_city, vend_state, vend_zip, vend_country )
				    select vend_id, vend_name, vend_address, vend_city, vend_state, vend_zip, vend_country from	vendors
# 数据的导入与导出
exp c##wxsw/wxsw@orcl full=y inctype=complete file=131516.dmp
exp scott/123456@192.168.35.129:1521/ORCL  full=y inctype=complete  file=d:/scott-wxsw.dmp


导出
exp username/password@address/listener file=D:\test\a.dmp
 
导入
imp username/password@host/listener file = D:\xx\xx.dmp log = D:\xx\xx.log full = y

# listagg
create table TR_RATE_FACILITY_ASSIGN("UUID" CHAR(32) NOT NULL ENABLE, 
  "TRF_GROUP_UUID" CHAR(32), 
  "FCIL_CDE" VARCHAR2(20) NOT NULL ENABLE )
  
  
    1	1 	e1dadd566f894627b26a19ee347ac788	APU02
    2	2 	e1dadd566f894627b26a19ee347ac788	APU01
    3	3	e1dadd566f894627b26a19ee347ac788	APU03
    4	4	e1dadd566f894627b26a19ee347ac788	AQG01
    5	5	9d630d6df637484ab6f966e47a077d00	BHY01
    6	6 	9d630d6df637484ab6f966e47a077d00	BHY02
    7	7 	9d630d6df637484ab6f966e47a077d00	APU02
  
SELECT TRF_GROUP_UUID,
    listagg(FCIL_CDE,',') within GROUP(ORDER BY uuid) facility
FROM
    TR_RATE_FACILITY_ASSIGN
GROUP BY
    TRF_GROUP_UUID
    
    
1	9d630d6df637484ab6f966e47a077d00	BHY01,BHY02,APU02
2	e1dadd566f894627b26a19ee347ac788	APU02,APU01,APU03,AQG01
# 表字段 - 注释
select t.*
  from ALL_OBJECTS t
 where t.OBJECT_TYPE = 'TABLE'
   and t.OBJECT_NAME = 'BIZ_TASK'
   and t.OWNER = 'C##WXSW';
SELECT distinct t.OBJECT_TYPE from all_objects t;
SELECT * FROM V$VERSION;
select * from ALL_VIEWS;
SELECT * FROM PRODUCT_COMPONENT_VERSION;
SELECT * FROM PRODUCT_PROFILE;
SELECT * FROM PRODUCT_USER_PROFILE;
-- 表备注信息
select *
  from all_tab_comments t
 where t.OWNER = 'C##WXSW'
   and t.TABLE_NAME = 'BIZ_TASK';
select * from all_tab_comments t where t.TABLE_NAME = 'BIZ_TASK';
Comment on table BIZ_TASK is '表备注信息......';
Comment on table "C##LIUZHE".BIZ_TASK is '表备注信息......';
-- 表字段信息
select *
  from all_tab_cols t
 where t.OWNER = 'C##WXSW'
   and t.TABLE_NAME = 'BIZ_TASK';
select *
  from all_tab_columns t
 where t.OWNER = 'C##WXSW'
   and t.TABLE_NAME = 'BIZ_TASK';
-- 表字段注释信息
select *
  from all_col_comments t
 where t.OWNER = 'C##WXSW'
   and t.TABLE_NAME = 'BIZ_TASK';
-- 表字段注释信息修改
Comment on column Biz_Task.Id is '主键'
# 锁
# 死锁查看
SELECT object_name, machine, s.sid, s.serial#
FROM gv$locked_object l, dba_objects o, gv$session s
WHERE l.object_id = o.object_id
 AND l.session_id = s.sid
order by s.sid;
# 杀掉死锁
alter system kill session '317,36633';
# PL/SQL 工具查看
工具->会话
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