oracleÖÐtypeµÄʹÓÃ
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
×¢Òâ ¸ÃÊý×éµÄϱêÊÇ´Ó 1¿ªÊ¼µÄ
Ïà¹ØÎĵµ£º
Ò»£®Ê²Ã´ÊÇ×¢²á
×¢²á¾ÍÊǽ«Êý¾Ý¿â×÷Ϊһ¸ö·þÎñ×¢²áµ½¼àÌý³ÌÐò¡£¿Í»§¶Ë²»ÐèÒªÖªµÀÊý¾Ý¿âÃûºÍʵÀýÃû£¬Ö»ÐèÒªÖªµÀ¸ÃÊý¾Ý¿â¶ÔÍâÌṩµÄ·þÎñÃû¾Í¿ÉÒÔÉêÇëÁ¬½Óµ½Êý¾Ý¿â¡£Õâ¸ö·þÎñÃû¿ÉÄÜÓëʵÀýÃûÒ»Ñù£¬Ò²ÓпÉÄܲ»Ò»Ñù¡£
¡¡¡¡ÔÚÊý¾Ý¿â·þÎñÆ÷Æô¶¯¹ý³ÌÖУ¬Êý¾Ý¿â·þÎñÆ÷»áÏò¼àÌý³ÌÐò×¢²áÏàÓ¦µÄ·þÎñ£¨ÎÞÂÛºÎʱÆô¶¯Ò»¸öÊý¾Ý¿â£¬Ä¬Èϵض¼ ......
ÎÒÔÚ¹¤×÷ÖÐÔÚOracleÖжà±í²éѯÔÙ°´Ê±¼äµ¹Ðòʱ£¬ÓÃorder by ±íÃû.datatime desc ×ÜÊÇʵÏÖ²»ÁË¡£
²»¹ý×îºóÎÊÑî¾é×îºóºÍÎÒ˵¿ÉÒÔ°ÑÎÒÃDzéѯµÄ×ܸösqlÓï¾ä×öΪһ¸ö±íÀ´ÅÅÐò£º
select rownum,aa.* from (.... order by ±íÃû.datatime desc ) aa ......
ÉÏһƪÎÄÕÂдÁËÒ»¸öoracleµÄÒ»¸öÐÐתÁеÄÀý×Ó£¬ÀïÃæÓõ½ÁËoracleÖÐÖØÒªµÄº¯Êý decode,ÕâÆªÎÄÕ¾ÍÀ´¼òµ¥µÄѧϰÕâ¸öº¯Êý
DECODEº¯ÊýºÍÎÒÃÇÓïÑԽṹÖеÄÌõ¼þÓï¾ä£¨IF£©ÏàËÆ¡£Ëü½«ÊäÈëÊýÖµÓ뺯ÊýÖеIJÎÊýÁбíÏà±È½Ï£¬¸ù¾ÝÊäÈëÖµ·µ»ØÒ»¸ö¶ÔÓ¦Öµ¡£
DECODEº¯ÊýÏ൱ÓÚÒ»Ìõ¼þÓï¾ä(IF).Ëü½«ÊäÈëÊýÖµÓ뺯ÊýÖеIJÎÊýÁбíÏà±È½Ï£¬¸ù¾ÝÊ ......
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 & ......
oracle 10g em¡¢isqlplus·ÃÎʲ»Á˵Ľâ¾ö·½·¨£¨»ã×Ü£©
oracle 10g em¡¢isqlplusµÄ¹ÜÀí
Èç¹ûweb·½Ê½µÄem£¬isqlplus·ÃÎʲ»ÁË¡£
1. ¼ì²éÖ÷»úÃû/IP¡¢¶Ë¿ÚÊÇ·ñÕýÈ·
°²×°Ê±µÄÖ÷»úÃû/IP¡¢¶Ë¿Ú¼Ç¼ÔÚ$ORACLE_HOME/install/portlist.ini ÎļþÖС£
ȱʡÊÇ£º
Ò»°ãÓû§   ......