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    SqlServer2000 2005
 MySql      
 DB2
 ORACLE   sun  SUN
 
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 Êý¾Ý Data
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 DBMS  Êý¾Ý¿â¹ÜÀíϵͳ
    SQL : ½á¹¹»¯²éѯÓïÑÔ
 
 ±ÊÊÔ:  scjp sql    20 - 30%
    Oracle 10g XE
    Oracle 9i 
  
  SQL:
      CRUD
           Ôöɾ¸Ä²é  
     DDL
     DML
     DCL: DBA
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     select  table_name  from  user_tables;
     SELECT  Òª²éµÄÊý¾Ý  from  ´ÓÄÄÀï²é
      1. ²éʲô
      2.  ´ÓÄÄÀï²é  
 ²éѯ s_emp ËùÓÐÐÐËùÓÐÁÐ
    select  *  from  s_emp ; 
  
    Ö¸¶¨Áвéѯ (×Ö¶ÎÃûÖ®¼äʹÓöººÅ·Ö¸ô)
    select  first_name , last_name   from  s_emp ; 
    
 SELECT last_name, salary * 12, commission_pct from s_emp;
   
    ʹÓÃNVLº¯Êý¿ÕÖµÎÊÌâ
    SELECT last_name, title, salary*commission_pct/100 + salary      from  s_emp;
    SELECT last_name, title, salary*NVL(commission_pct,0)/100 + salary   from      s_emp;
   
 ×ֶαðÃû
    as  ±ðÃû  " ±ð Ãû "
 ×Ö·ûÁ¬½Ó
 select  first_name || last_name  " ÐÕ Ãû "   from s_emp ;
 
 DISTINCT  &n


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