ͻ񻣼
create table score( uid VARCHAR(10), subject_id VARCHAR(10), score int) DROP TABLE scoreINSERT INTO score VALUES ('1001','01' ,88),('1001','02' ,98),( ÔĶÁÈ«ÎÄ
ͻ񻣼
1.ctrl+r ÔËÐе±Ç°²éѯ´°¿ÚµÄËùÓÐsqlÓï¾ä2.ctrl+shift+r Ö»ÔËÐÐÑ¡ÖеÄsqlÓï¾ä3.ctrl+/ ×¢ÊÍsqlÓï¾ä4.ctrl+shift+/ ½â³ý×¢ÊÍ5.ctrl+q ´ò¿ª²éѯ´°¿Ú6.ctrl+n ´ò¿ªÒ»¸öеIJéѯ´°¿Ú7.ctrl+w ¹Ø±Õµ±Ç°²éѯ´°¿Ú8.Shift+Home ÔĶÁÈ«ÎÄ
ͻ񻣼
Òý×Ô£º/aspirant/p/14082609.html Èý´ó·¶Ê½Í¨Ë×½âÊÍ£º £¨1£©¼òµ¥¹éÄÉ£º µÚÒ»·¶Ê½£¨1NF£©£º×ֶβ»¿É·Ö£» µÚ¶þ·¶Ê½£¨2NF£©£ºÓÐÖ÷¼ü£¬·ÇÖ÷¼ü×Ö¶a56爆大奖在线娱乐ÀÀµÖ÷¼ü£» µÚÈý·¶Ê½£¨3NF£©£º·ÇÖ÷¼ü×ֶβ»ÄÜÏ໥ÒÀÀµ¡£ £¨2£©½âÊÍ£º 1NF£ºÔ×ÓÐÔ ÔĶÁÈ«ÎÄ
ͻ񻣼
Ë÷Òý£º±íÖÐÊý¾Ý¹Ø¼ü×ֶεIJéѯÌõ¼þÖµ£»ÌṩָÏò´æ´¢ÔÚ±ê×¢Ö¸¶¨ÁÐÖеÄÊý¾ÝÖ¸Õ룬Êý¾Ý¿â¸ù¾ÝÖ¸ÕëÕÒµ½Ìض¨µÄÖµ£¬È»ºóÊú×ÅÖ¸ÕëÕÒµ½°üº¬¸ÃÖµµÃÐС£ÕâÑù¾ÍʵÏÖÁË¿ìËÙ·ÃÎÊÊý¾Ý¿â¡£ Ë÷ÒýµÄ×÷Ó㺠µ±±íÖÐÓдóÁ¿Êý¾Ý£¬¶Ô±íÖÐÊý¾Ý½øÐвéѯ£¬ÓÐÁ½ÖÖ·½·¨£¬ÆäÒ»£¬È«±í²éѯ--Âý£¬ÀË·ÑIO£¬Æä¶þË÷Òý²éѯ--Ëٶȿ죬µ«ÊÇÐèÒªÌáÇ°´´½¨ºÃ ÔĶÁÈ«ÎÄ
ͻ񻣼
ÔĶÁÈ«ÎÄ
ͻ񻣼
ClickHouse ClickHouse ÊǶíÂÞ˹µÄ Yandex ÓÚ 2016 Ä꿪ԴµÄÁÐʽ´æ´¢Êý¾Ý¿â£¨DBMS£©£¬Ö÷ÒªÓÃÓÚÔÚÏß·ÖÎö´¦Àí²éѯ£¨OLAP£©£¬Äܹ»Ê¹Óà SQL ²éѯʵʱÉú³É·ÖÎöÊý¾Ý±¨¸æ¡£ 1°²×°ÒÀÀµ [root@hadoop102 ~]# yum install -y libtool ÔĶÁÈ«ÎÄ
ͻ񻣼
sparkµÄweb·ÃÎʶ˿ÚÐ޸ģº ÔĶÁÈ«ÎÄ
ͻ񻣼
¾ßÌåÁ÷³Ì£¨ÊµÊ±£©£º Ó¦ÓóÌÐò¼¯³ÉSDK£¬Í¨¹ýAPI½Ó¿ÚʵÏÖÈÕÖ¾µÄÉÏ´« ͨ¹ýkafka½«ÉÏ´«µÄÈÕÖ¾ÎļþÊÕ¼¯£¬ ʹÓúÏÊʵÄʵʱÁ÷´¦Àí×é¼þ¶ÔÊý¾Ý½øÐÐʵʱ´¦Àí£¨storm£¬SparkStreaming£¬flink£© ½«´¦ÀíµÄÊý¾Ý±£´æÔÚÊý¾Ý¿âÖÐ(mongdbµÈ) ½ÓÏÂÀ´Ç°¶ËʹÓÃdubbo½«ËùÐèµÄÊý¾Ý²éѯ ʹÓà ÔĶÁÈ«ÎÄ
ͻ񻣼
µ±Ö´ÐÐshellÃüÁîʱ£¬»áĬÈÏ´ò¿ª3¸öÎļþ£¬a56爆大奖在线娱乐ÎļþÓжÔÓ¦µÄÎļþÃèÊö·ûÀ´·½±ãa56爆大奖在线娱乐ÃÇʹÓ㺠ÀàÐÍÎļþÃèÊö·ûĬÈÏÇé¿ö¶ÔÓ¦Îļþ¾ä±úλÖà ±ê×¼ÊäÈ루standard input£© 0 ´Ó¼üÅÌ»ñµÃÊäÈë /proc/self/fd/0 ±ê×¼Êä³ö£¨standard output£© 1 Êä³öµ½ÆÁÄ»£¨¼´¿ØÖÆ̨£© /pr ÔĶÁÈ«ÎÄ
ͻ񻣼
ÎÄÕÂÒý×Ô£ºhttps://www.meiwen.com.cn/subject/ypmbpctx.html flinkÌṩ²»Í¬µÄ״̬ºó¶Ë£¨state backends£©À´Çø·Ö״̬µÄ´æ´¢·½Ê½ºÍ´æ´¢Î»Öá£flink״̬¿ÉÒÔ´æ´¢ÔÚjava¶ÑÄÚ´æÄÚ»òÕßÄÚ´æÖ®Í⡣ͨ¹ý״̬ºó¶ËµÄÉèÖã¬flinkÔÊÐíÓ¦Óñ£³Ö´óÈÝÁ¿ ÔĶÁÈ«ÎÄ