oracle ²éѯÓï¾äµÄ±àд °ÝÍи÷λ¡«¡«¡«¡«¡«
ÔÚÒ»¸ö a ±íÖÐÓÐ×Ö¶Î a1¡¢ a2 ¡¢ a3 ¡¢a4 ¡¢a5, a1ÊDZàºÅ£¨Ö÷¼ü£©¡¢a2ÊÇÃû³Æ¡¢a3ÊÇ״̬ ¡¢a4ÊÇÌáÎÊ¡¢a5»Ø´ð ÎÊÌ⣺ÔõôÓÃÒ»ÌõsqlÓï¾ä²éѯ³öÀ´ÏÂÃæ±í ±àºÅ Ãû³Æ ÌáÎÊ×ÜÊý δ»Ø´ðÌáÎÊ£¨×´Ì¬1£© ÒѻشðÌáÎÊ£¨×´Ì¬2£© 1 ÕÅÈý 3 2 1 2 ÕÔËÄ 4 2 2 3 ÍõÎå 5 5 0 4 ÀîÁù 6 0 6 Ôڴ˹òл
ÐÐÁÐת»»µÄ¾µäÎÊÌâ sum(decode())À´×ö Ö»ÊÇÔʼÊý¾ÝÊÇÔõôÑùµÄ£¿ ״̬ÊÇÔõôÑùµÄ ¸ù¾Ýa2Ãû³Æ·Ö×éºóͳ¼Æ·Ö״̬´¦Àí ûÓÐÊý¾Ý°¡ÒýÓà ÐÐÁÐת»»µÄ¾µäÎÊÌâ sum(decode())À´×ö Ö»ÊÇÔʼÊý¾ÝÊÇÔõôÑùµÄ£¿ ״̬ÊÇÔõôÑùµÄ ÌùµãÊý¾Ý¿´¿´ÒýÓà select a1,a2,count(1),sum(case when a3=0 then 1 else 0 end), sum(case when a3=1 then 1 else 0 end) from tab group by a1,a2 ÎÊÌâÒѽâ¾ö£¬Ð»Ð» select a1,a2,count(1),sum(case when a3=0 then 1 else 0 end), sum(case when a3=1 then 1 else 0 end) from tab group by a1,a2 ¾µä
Ïà¹ØÎÊ´ð£º
°²×°ÁËOracle 10g£¬Ä¬Èϰ²×°ÁËorclÊý¾Ý¿â£¬Õâ¸öÊý¾Ý¿âÄܲ»ÄÜɾ³ý°¡£¬»¹ÓÐÎÒÈç¹ûн¨ÁËÆäËûÊý¾Ý¿â£¬Ôõô֪µÀÔÚwebÖеǽ²»Í¬Êý¾Ý¿âµÄµØÖ·°¡£¿ 1 ¿ÉÒÔɾ³ý 2 ÔÚWEBµØÖ·À¸ÖÐÊäÈëµØÖ·µÄʱºòÖ¸¶¨Ð´´½¨µÄÊý¾Ý¿âµÄIP ......
ÎÒÔÚ¿ª·¢µÄÕâ¸öÓ¦Óò¢·¢ÐԱȽϸߣ¬oracle¸üÐÂÊý¾ÝʱºòÈçºÎ´¦Àí²¢·¢´¦ÀíÄØ£¿¸÷λ´óÏÀ·¢±íºÃµÄ¹Ûµã°¡£¬ÔÚÏߵȴý£¡ oracleÊý¾Ý¸üÐÂʱ£¬»á×Ô¶¯Ä¬ÈÏÐÐËø¶¨£¬Â¥Ö÷²»Òª²ÙÐÄ£¬Oracle¶Ô²¢Ðд¦ÀíÒѾºÜ³ÉÊìÁË ÒýÓà oracle ......
ÓÃPL/SQL µÇ½ʱµ¯³ö±¨´í´°¿Ú£¬´íÎóÈçÏ£¡ ORA-01034:ORACLE not available ORA-27101:shared memory realm does not exist ÇëÎÊ£¬ÓÐûÓÐÈËÓöµ½ÕâÖÖÇé¿ö£¬Ôõô½â¾ö£¿Ð»Ð»£¡ 1. Oracle sid ÕýÈ ......
СµÜ£¬×î½üҪתÐÐÈ¥×öoracle¿ª·¢ÁË£¬ÓÉÓÚ´óѧ±Ïҵʱ£¬×ßÁ˸öÍä·£¬ÏÖÔÚºÜСÐÄ£¬ÎÊÏ£¬×öPL/SQLÓÐûÓÐǰ;£¿£¿£¿ µ±È»ÎÒ˵µÄÕâ¸öǰ;ÊÇÖ¸ ÒÔºóÒªÌø²Û£¬Êг¡¶ÔÕâÑùµÄÈ˲ŵÄÐèÇóÁ¿´ó²»´ó£¿£¿ 3q ÄÇ¿´À´»¹Ö»ÄÜÏȽӴ ......
±¾ÈËÏÖÔÚѧoracle ËãÊǸոÕÈëÒ»°ëÃÅ ÒÔºó»¹ÒªÑ§java ¸÷λ´óÏÀoracleºÃÈëÊÖ»¹ÊÇjavaºÃÈëÊÖ°¡ ÒÔºóÄǸö·½Ãæ·¢Õ¹»áºÃЩ £¬ÎÒÔÝʱÓиöÏë·¨ÏëºÃºÃѧϰһÏÂÊý¾Ý¿âÒÔºóÍùÕâ·½±ã·¢Õ¹£¬±Ï¾¹Êý¾Ý¿â¸úл»´úûÓÐjavaÄÇô¿ì£¬²» ......