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SQL> DESC TEST  ²âÊÔ±í:        Name    Type            Nullable    Default Comments
       ----     ------------         --------      -------     --------
       A        NUMBER           Y                        
       B        VARCHAR2(20) Y          SQL> select * from test;                  A B
       ---------- --------------------
                 1 a
                 1 b
                 1 c
                 1 d
                 1 e
                 2 a
                 2 b
                 3 a
         


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oracle 10.2.0.4 ²¹¶¡ÏÂÔØ£¨ÊÊÓÃÓÚËùÓвÙ×÷ϵͳ£©:
ftp://updates.oracle.com/6810189/p6810189_10204_AIX5L.zip
ftp://updates.oracle.com/6810189/p6810189_10204_HPUX-IA64.zip
ftp://updates.oracle.com/6810189/p6810189_10204 ......

oracle Ò»´Îɾ³ý¶àÕűíµÄÊý¾Ý£¨Î´²âÊ԰棩

spool d:\deletetb.sql;
select 'delete ' || table_name || ' where to_char(col,'||'''yyyy'''||')='||'''2007'''||';'
  from user_tables
where table_name in  (select 'HS_' || lpad(rownum, '2', '0')
          from dual
        ......

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1.LOWER(str) Ç¿ÖÆÐ¡Ð´
2.UPPER(str) Ç¿ÖÆ´óд
3.INITCAP(str) ÿ¸öµ¥´ÊÊ××Öĸ´óд
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SQL> select initcap('my_boy') from dual; --·µ»Ø"My_Boy"
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4.CONCAT(str1,str2£©Á¬½Óº¯Êý,Á¬½Óstr1ºÍstr2×Ö·û´®
5.SUBSTR(string,a[,b])·µ»ØstringµÄÒ»²¿·Ö£¬aºÍbÒÔ×Ö·ûΪµ¥Î»¡£´Ó× ......

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