几种数据库的SQL判断表是否存在

 Oracle：

 

 

declare
var_exists int;

begin
 select count(1) into var_exists from user_all_tables where table_name = upper('table_01');
 if (var_exists = 0) then
  execute immediate('create table table_01  (
   id               NUMBER(10)                      not null,
   name             VARCHAR2(100)                   not null,
   constraint table_01_11735761881 primary key (id)
  )');
 end if;
end ;

/
commit;

 

 

Sybase：

 

if  not exists(select 1 from sysobjects where id = object_id('table_01) )
 
exec("create table table_01(
    id            numeric(10)           not null,                --  
    name          varchar(100)          not null,                --  
    primary key (id)                        
)")
go