oracle随笔

SELECT tablespace_name,file_name,autoextensible
  FROM dba_data_files
 WHERE tablespace_name = ‘SCHEMA‘;

SELECT column_name
  FROM user_col_comments 
 WHERE table_name = ‘tablename‘;

SELECT t.table_name, f.comments
  FROM user_tables t
 INNER JOIN user_tab_comments f
    ON t.table_name = f.table_name;

SELECT t.table_name, f.comments
  FROM user_tables t
 INNER JOIN user_tab_comments f
    ON t.table_name = f.table_name
 WHERE t.table_name LIKE ‘BIZ_DICT%‘;

SELECT a.num_rows, a.table_name, b.comments
  FROM user_tables a, user_tab_comments b
 WHERE a.table_name = b.table_name
 ORDER BY table_name;

merge into test_merge a
using test b
on(a.no=b.no)
when matched then update set a.no2=b.no2 where a.no<>1
when not matched then insert values(b.no,b.no2)  where a.no<>100

create or replace procedure NoParPro  
 as  //声明  
 ;  
 begin // 执行  
 ;  
 exception//存储过程异常  
 ;  
 end;  

create or replace procedure queryempname(sfindno emp.empno%type)   //%type表示参数属性与表emp的empno字段一样
as  
   sName emp.ename%type;  
   sjob emp.job%type;  
begin  
       ....  
exception  
       ....  
end;

create or replace procedure runbyparmeters    
    (isal in emp.sal%type,   
     sname out varchar,  
     sjob in out varchar)  
 as   
    icount number;  
 begin  
      select count(*) into icount from emp where sal>isal and job=sjob;  
      if icount=1 then  
        ....  
      else  
       ....  
     end if;  
exception  
     when too_many_rows then  
     DBMS_OUTPUT.PUT_LINE(‘返回值多于1行‘);  
     when others then  
     DBMS_OUTPUT.PUT_LINE(‘在RUNBYPARMETERS过程中出错！‘);  
end;  

DECLARE
  realsal  emp.sal%TYPE;
  realname VARCHAR(40);
  realjob  VARCHAR(40);
BEGIN  / / 过程调用开始
  realsal := 1100;
  realname := ‘‘;
  realjob := ‘CLERK‘;
  runbyparmeters(realsal, realname, realjob);  －－必须按顺序 / / runbyparmeters为存储过程 
  dbms_output.put_line(realname || ‘   ‘ ||realjob);
END;
/ / 过程调用结束

declare  
     realsal emp.sal%type;  
     realname varchar(40);  
     realjob varchar(40);  
begin    //过程调用开始  
     realsal:=1100;  
     realname:=‘‘;  
     realjob:=‘CLERK‘;  
     －－指定值对应变量顺序可变  
     runbyparmeters(sname=>realname,isal=>realsal,sjob=>realjob);      //runbyparmeters为存储过程
    DBMS_OUTPUT.PUT_LINE(REALNAME||‘   ‘||REALJOB);  
END;  //过程调用结束  

 SQL>exec  proc_emp(‘参数1‘,‘参数2‘);//无返回值过程调用  
 SQL>var vsal number  
    SQL> exec proc_emp (‘参数1‘,:vsal);// 有返回值过程调用  
      或者：call proc_emp (‘参数1‘,:vsal);// 有返回值过程调用 

CREATE  OR REPLACE VIEW V554211TJ01
AS
SELECT T1.columnname1,
       t2.columnname2,
       ta.columnname2,
       t3.columnname2
  FROM table1 T1
  LEFT JOIN (SELECT ta.columnname1 columnname1
               FROM table2 T2
              WHERE T2.SDSRP5 = ‘KIT‘) TA
    ON TA.columnname1 = T1.columnname1,
   LEFT JOIN table3 T3 ON T3.columnname1=T1.columnname1
 WITH READ ONLY