Oracle 常用語句列表

1.複製表結構及其資料

create

table table_name_new as
select * from table_name_old

create

table table_name_new as
select * from table_name_old where
1=2;

如果兩個表結構一樣：

insert
into table_name_new select * from table_name_old

如果兩個表結構不一樣：

insert
into table_name_new(column1,column2...) select column1,column2... from table_name_old

select (select

count(id) from aa)+(select
count(id) from bb) 總數 from dual;
--總數那是沒有單引號的，雙引號可以。

select

ceil(n) from dual;

select last_day(sysdate) from dual;

select * from table_name where rowid!=(select

max(rowid) from table_name where table_name.col1=d.col1 and table_name.col2=d.col2);

delete

from table_name where rowid!=(select
max(rowid) from table_name d where table_name.col1=d.col1 and table_name.col2=d.col2);

檢視使用者下所有的表 

select * from user_tables; 
檢視名稱包含log字元的表 
select object_name,object_id from user_objects 
where instr(object_name,'log')>0; 
檢視某錶的建立時間 
select object_name,created from user_objects where object_name=upper('&table_name'); 
檢視某錶的大小 
select sum(bytes)/(1024*1024) as "size(m)" from user_segments 
where segment_name=upper('&table_name'); 
檢視放在oracle的記憶體區里的表 
select table_name,cache from user_tables where instr(cache,'y')>0;

檢視序列號，last_number是當前值

select * from user_sequences;

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