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create or replace type mytype IS TABLE OF varchar2(20);
declare type1 mytype :=mytype('1','2','3','4');
i number:=1;
var_str varchar(20):='liaomin';
begin
type1.EXTEND;
type1(type1.COUNT):=var_str;
loop
  dbms_output.put_line(type1(i));
  i:=i+1;
  exit when i=type1.count+1;
 end loop;
end;
×¢ÒâµØ·½  IS TABLE OF varchar2(20); ±íʾ±í¸ñÖеÄvarchar2(20) Ï൱ÓÚÒ»ÁÐÊý¾Ý ÕâÀï¾Í±íʾÊý×é
type1ÐèÒªÌí¼ÓÊý¾Ý ±ØÐëµ÷Óà EXTENDÌí¼ÓÒ»·ÝµØÖ·  Æäʵ×îºóÒ»¸öλÖà Ҳ¾ÍÊǸÃÌí¼ÓÖµµÄµØ·½
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SELECT * from
(
SELECT A.*, ROWNUM RN
from (SELECT * from TABLE_NAME) A
WHERE ROWNUM <= 40
)
WHERE RN >= 21
ÆäÖÐ×îÄÚ²ãµÄ²éѯSELECT * from TABLE_NAME±íʾ²»½øÐз­Ò³µÄԭʼ²éѯÓï¾ä¡£ROWNUM <= 40ºÍRN >= 21¿ØÖÆ·ÖÒ³²éѯµÄÿҳµÄ·¶Î§¡£
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oracle ÖеÄINTERVAL º¯ÊýÏê½â

INTERVAL YEAR TO MONTHÊý¾ÝÀàÐÍ
OracleÓï·¨:
INTERVAL 'integer [- integer]' {YEAR | MONTH} [(precision)][TO {YEAR | MONTH}]
¸ÃÊý¾ÝÀàÐͳ£ÓÃÀ´±íʾһ¶Îʱ¼ä²î, ×¢Òâʱ¼ä²îÖ»¾«È·µ½ÄêºÍÔÂ. precisionΪÄê»òÔµľ«È·Óò, ÓÐЧ·¶Î§ÊÇ0µ½9, ĬÈÏֵΪ2.
eg:
INTERVAL '123-2' YEAR(3) TO MONTH   & ......
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