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http://database.51cto.com/art/201004/196494.htm
http://database.51cto.com
2010-04-23 15:20 ØýÃû »¥ÁªÍø ÎÒÒªÆÀÂÛ(
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»°£¬ÒÔϵÄÎÄÕÂÖ÷Òª¾ÍÊǶÔÆäÏà¹ØÄÚÈÝµÄ ......
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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»½øÐзҳµÄÔʼ²éѯÓï¾ä¡£ROWNUM <= 40ºÍRN >= 21¿ØÖÆ·ÖÒ³²éѯµÄÿҳµÄ·¶Î§¡£
ÉÏÃæ¸ø³öµÄÕâ¸ö·ÖÒ³²éѯÓï¾ä£¬ÔÚ´ó¶à ......
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intervalÊÇÖ¸ÉÏÒ»´ÎÖ´ÐнáÊøµ½ÏÂÒ»´Î¿ªÊ¼Ö´ÐеÄʱ¼ä¼ ......
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 & ......
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; ......