oracle資料庫的操作語句

//備份

create table [備份名] as select * from [表名]
;//恢復
truncate table org_group;
//此為清空表操作,慎用
insert into org_group select * from [備份名]
;

//備份表

//oracle使用者終端執行：
exp [使用者名稱]
/[密碼] tables=
[表一]
,[表二] file=
/home/oracle/table.dmp
//恢復表
//oracle使用者終端執行：
imp [使用者名稱]
/[密碼] grants=y commit=y full=y ignore=y file=
/home/oracle/table.dmp

create table tablename (age int

,name string ……)

select * from user_tab_columns t where t.table_name=

'表名'
;

truncate table [表名]

;

drop table [表名]

;

alter table [老表名] rename to [新錶名]

;

alter table [表名] add  [新增字段]

[字段型別]
;

alter table [表名] modify [表字段]

[新型別]
default
'[預設填充的值]'
;

alter table [表名] rename column [老表字段] to [新表字段]

;

alter table [表名] drop column  [要刪除的表字段]

;

update [表名] set [欄位名]

=[新值] where [條件]
;

insert into [表名]

([欄位1],
[欄位2
]) values (
[值1]，[值2])
;

insert into [表名]  values (

[值1]
,[值2],
[值3]..
....
);

delete from [表名] where [字段]

=[值]
;

select distinct [字段]  from [表名]

;

select * from [表名] where [欄位名] is not null;

//字串沒有限制,主要是用來標識查詢到的字段資訊

select  '[字串1]'
||[欄位名1]||
'[字串2]'
||[欄位名2]||
'[字串3]'
||[欄位名3
] as [新建的欄位名,用來放前面的查詢來的資訊] from [表名]
;

update t_mp_material_news_item a

set is_deleted =
1where  exists (select 1
from t_mp_material_news b
where b.id=a.news_id and to_char
(b.create_time,
'yyyy-mm-dd'
)<
'2019-01-01'
)//查詢驗證
select a.create_time,b.is_deleted
from
t_mp_material_news_item b ,t_mp_material_news a  
where b.news_id=a.id and to_char
(a.create_time,
'yyyy-mm-dd'
)>
'2019-01-01'

<

if test=
"item.title != null and item.title != ''"
>
and title like concat
(concat
('%',#)
,'%'
)>

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