Sql经典教程

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Sql经典教程

  1. 1. µÚÈý²¿·Ö ²Ù×÷Êý¾Ý£ºSQL ±¾²¿·ÖÄÚÈÝ SQL »ù´¡ Öм¶ SQL ¸ß¼¶ SQL
  2. 2. µÚ 10 Õ SQL »ù´¡ ±¾ÕÂÄÚÈÝ SQL ½éÉÜ Ê¹Óà SELECT Óï¾ä´±íÖÐÈ¡ÊýÝ ´ ½¨Ð±í ×Ö¶ÎÊôÐÔ Ïò±íÖÐÌ ¼ÓÊý¾Ý ɾ³ýºÍÐ޸ıí
  3. 3. ½¨Á¢Ò»¸öÄ㪠ÀýÈ磬 ÄãÐèҪʹÓÃý¾Ý¿âÀ´æ¢×Ô·ÎÕßµÅÏ¡£ Á¢½»¥Õ¾µã£¬ÎªË¨ ´½¨ Ëù¸ÐȤµÄ¹×÷ÕâÑÅÏ¢¡£ Äã¾ÍÐèÒª´æ¢ÖîÈç¸ö˼òÀú£¬ Ö°Òµ½éÉÜ·þÎñÄվ㣬 Äã¾ÍÐèÒª´ÓÊýÝ Èç¹ûÄãÏëÔʾ·ºÀ´ÃÕßÒªÇóµ×î¤÷£¬ ¶¯Ì¬ÍøÒ²ÐèªÊ¹ÓÃý¾Ý¿â£ ¿âÖÐÈ¡³öշݹ¤×÷µÄÅÏ¢£ã½«»á¬ÔÚí¶àÇéÂèÒªÊÓÃý¾ £¨ ¡°½á¹»¯²éÑÓïÔ± Ä㫧õùÊà ÕÂÀ£¬ÚâÒ SQL¡Êý¾Ý¿â¡£À´²Ù×÷ ³ SQL ÓïÑÔÊÇ Êý¾Ý¿âµÄ±ê×¼ÓïÑÔ¡£Ú Active Sever Pages ÎÞÂۺʱÄãÒª·Ã»¸öý¾Ý¿â£¬Í¹ÖÐ Óà SQL ÓïÑÔ¡£Òò´Ë¬ÕÆκà SQL ¶Ô ASP ±à³ÌÊÇ·£ÖØÒªµÄ¡ ×¢Ò⣺ Ä ã ¿ É Ò Ô ° Ñ ¡ ° SQL ¡ ± ¶ Á × ÷ ¡ ° sequel ¡± £ ¬ Ò ² ¿ É Ò Ô ° ´ µ ¥ ¸ ö × Ö Ä ¸ µ Ä ¶ Á Ò ô ¶ Á × ÷ S £- Q £- L ¡£ ¡°SÔÈÏΪ Ú±¾ÊéÀ ÿַ¢Òô¸÷ÓдóÁµÄ§³Õß¡£ QL Á½Ö·¢Òô¶¼ÊÇÕýȵģ¬ ÷¡° × ¡±¶Á sequel¡± ¡£ Ä㽫ÀíâÔõÑùÓà һÕµÄѧϰ£¬Í¨¹ýâ SQL Ä㽫ѧ»áÔõùʹÓÃÕâÖ²é¯ ÏÖÊý¾Ý¿â²éѯ£¬µ ´ÓÊý¾Ý±íÖÐÈ¡³öÅÏ¢£¬×îºóÄ㽫ѧ»áÔõùÉè¼ÆͨÁµ¿â ×¢Ò⣺ Ã漸Õ¶Ôͨ¹ýÏ SQL µÄ½éÉÜ£¬ã«¶Ô SQL ×ã¹»µÄÁ˽⣬´Ó¶ø¿ÉÒÔЧØÊà Active Sever Pages¡£µ«ÊǬSQL ÊÇÒ»Ö¸´ÔÓµÄïÑ£¬±¾é²¿ÉÜ°üÀ¨ËȫϽڡªÃæÕÆÎ SQL ÐèҪѧϰÔÚÓÄã Microsoft SQL Sever ùÓÊÐÖ SQL¡¿ÉÒÔµ½¸üÄÊéêÈ¥Âò»±¾£ã Microsoft SQL Sever 6.5¡£ SQL ½éÉÜ£º ÉèÄãÊÇÔÚ±¾é¼Ù SQL ²Ù×÷ Microsoft SQL Sever ¿â¡£ÄãÒ²ÉÔÓõÊý¾Ý SQL ×÷Ðí¶à²Ù ÆäËüÀàÐ͵ÄÊý¾Ý¿â¡£SQL ÉÏ£¬¹ØÓڨʵ ÊDzÙ×÷ý¾Ý¿âµÄ±ê¼ÓïÑÔ¡£ SQL ÓïÑÔÐÒ»¸öרÃÅµÄ ANSI ±ê×¼¡³ ×¢Ò⣺ ² Ò» ª Ô ÄÚ ã µ Õ ¾ É ÊÏ Í ¼ Ó Ã Microsoft Access ´úÌæ Microsoft SQL Sever¡£ SQL Sever Èç¹ûÄãϣ͵վÓн¸ß·ÃÎʬ ¿ÉÒÔͬʱ·þÎñÓÚÐí¶àû§£ MS Access Èεġ£ÊDz»Ü¤ ÔÚѧϰ SQLÁíÒ»¸öÕÆÎð Ò»¸öÌصãÈÝ×ÕÆΣ¬ ÄãÐèÒªÀí½âËüµÁ´óÌØ¡£ Ç°£¬µÄϸ½ÚÖ® À´Óеã§ÄÑ¡£ ÌصãÊÇËùÓÐÚÒ»¸ö SQLÏ ÀýÈ磬 Ò»¸ö±íÓÉкÍÁ×鳡£ µÄÊý¾Ý¶¼´æ¢ÔÚ±íÖС£¿â ÃæÕâ¸ö¼òµ¥Ä±í°üÀ¨ e-mail address£º name ºÍ Name Email Address ................................................................ Bill Gates billg@microsoft.com president Clinton president@whitehouse.com Stephen Walther swalther@somewhere.com £ºNÓÐÁ½£¨Ò²³ÆΪ×Ö¶¬ò¡ame Õâ¸ö±í ºÍ Email Address¡Ð£¬Ã¿Ò»°üºÓÈý ×éÊý¾Ý¡£Ò»ÐֵĺÏÔÚÆð³ÎªÌõ¼Ç һ¸öÊý¾Ý±í¿ÉÔÓм®Ç£¬ Äã¾ÍÌí¼ÓÁËÒ»õÐÂÇ¡£ ʱÄãÏòíÖÐ̼ÓÂý¾Ý£¬ÎÞÛº
  4. 4. Email ÖªµÀÄã« µØÖ·£¬ ÄÜÕâÑù×öÊǺõ£¬Ò²ÐíÓ»Ììãá誡 Ä ã µ Ê ý¾ Ý ¿ â º Ü Ó Ð ¿ ÉÄ ° ü º ¬ ¼ ¸ Ê ® ö ± í £ ¬ Ë ù Ó Ð´ æ ¢ Ô Ú Ä ã Ê ý¾ Ý ¿ â Ö Ð µ Ä ÅÏ ¢ ¶ ¼ ± » ´ æ ¢Ô Ú Õ â Ð © ± í ÖС£µ±Ä㿼ÂÇÔõÑù°ÅÏ¢´æÚÊý¾Ýâ¬Ó¦¸ÃËüí SQL ÕâÖÓïÑÔ±»Éè¼ÆΪ²ÊÐíÄã°´³Ìض¨µËòÀÈ¡ ¶þ¸öÌصãÓЩÄÑÚÕÆΡ£ ³ö¼Ç£¬ÒòΪÕâÑù×»á½µÍ SQL Sever ЧÂÊ¡£¹ÓÃÈ¼ÇµÄ SQL£°´²éѯÌõ¼þÀ¶ÁÈ¡¬ÄãÖ»Ü ¼Ç¡£ ÐíÄã»á³¢Ò² ÀýÈ磬 ×ÔÈ»áÏëµ½°´¼ÇÂÄÎÖöÁ¡Ëü£ ÈçºÎ´Ó±íÖС³ö¼ÇÂÊ£¬µ¿ ÊÔͨ¹ýÒ»¸öÑ-·£¬Öð¼ÇµØÉÃèÀ´¡³Ì¶ÄÚÓ SQL ʱ£¬ÄãØÐëѵÁ·×Ô¼º ²»ÒªÓÐÕâÖ˼·¡£ ¡°Bill Gates¡ÄãÒ²Ðí Èç¹ûÊÓô«Í³µ±àÌïÑÔ£¬ ¼Ç ÏëѳöËùÓеÄÃû×ÖÊǼÙÈçã »á¹ÔìÒ¸öÑ-·£¬Öð²é¿´±íеļÇÂÃû×ÓòÊñ¡°Bill Gates¡± ¡£ ÕâÖÑ¡Ôñ¼Çµķ½¨Ê¿ÉУ¬«§²»¸ß¹Óà SQL£¬ÄãֻҪ˵£ ¡°ÑÔñËùÓÐÃû×Ö ÓòµÈÚ Bill Gates ¡±QL £¬SµÄ¼Ç ΪÄãÑ¡³öËùÓзûºÏÌõ¼þµÇ£SQL ¾Í»á »áÈ·¶¨ÊµÏÖ²éѯ µÄ×î¼Ñ·½¨¡£ È¡³öÇ°Ê® Äã¿ÉÒÔ×ö»¸Ñ-·£¬ ʹÓô«Í³µÄ±àÌïÑÔ£¬ ÏëÈ¡³ö±íÖеÄÇ°Ê®¸¼Â£½¨Éèã µ«Ê¹Óñê×¼Ä ¸ö¼Çºó½áÊøÑ-»·¡£ SQL ´Ó ÊDz»¿ÉÄܵÏÖ¡£Õâ £¬²éѯ SQL ÔÚÒ» £¬µÄ½Ç¶ÈÀ´Ë ¸ö±íÖв»´æÔÚÇ°Ê®¼ÂÕâÅÄî¡£ µ±ÄãÖªÀ²»ÜÓà £¬¿ªÊ¼± SQLÄã Äã»áÊܵ½´ìÕÛ¡£ ¸Ð¾õÓ¦ÃÄÜʵÏÖ¹£¬³©ã Ò²Ðí»áÔÍ·×ǽÉõÖÁÏë´¶ñ¾µÄżþ¸ø SQL µ«ºóÀ´Äã»áÈÏʶ½£¬ Éè¼ÆÕßÃÇ¡ SQL µÄÕâ¸öÌØ ÒòΪ ·´¶øÊÇÆ䳤¦¡£ µã²»½öÊǸÏÞÖÆ£¬ SQLËü¶ÁÈ¡¼Ç¿ÉÒÔºÜì£ ¾ÝλÖÃÀ´¶ÁÈ¡¼Ç£¬²¸ù Êö£¬×ÛÉÏËù SQL ´Ó ËùÐÊý¾Ýæ¢ÔÚ±íÖ£¬ ¸öÌصãºÁ½ SQL ±íÖеļÇÂû Ë£¬½¶ÈÀ´ ÓÐ˳ò¡£ÔÚÏÂÒ»½¬Äã«Ñ§áõùà SQL ´Ó±íÖÐÑ¡ÔñÌØÊâµÄ¼Ç£ ʹÓà SQL ´Ó±íÖÐÈ¡¼Ç£ SQL Òª¹¦ÄÜÖ®»ÊǵÏý¾Ý¿â²éѯ¡£Èçûãì¤÷ Internet £¬ÄÇôãÒѾ-ÊìϤýæ ¹ûÄãÏëÕÒµ½ÓÐÈç ÀýÈ磬 ÄãʹÓòéѯÀ´È¡µÂú×Ìض¨õ¼þÐÅÏ¢£ ²éѯÁË¡£ ASP µÄÈ«²¿Õ¾ÐÅÏ¢ Äã¿ÉÒÔÁ¬½Óµ µã£¬ Yahoo!²¢Ö´ÐÒ»¸ö¶Ô Active Sever Pages ÔÚÄãÊäÈëÕâ¸ö²éѯºó£¬ ËÑ÷¡£µÄ Äã»áÊÕµ½Ò¸öÁÐ±í£¬Ö°üÀ¨ËùÓÆäÃèºÑ÷´ï¾¡ ¶àÊý Internet ÔÊÐíÂß¼-²éѯ¡£ÚÖ¬Äã¿ÉÒ°üÀ¨ÌØâµË·ûÈçýÇæ AND¡¢ OR ºÍ NOT£ÄÀ¿ÉÒÔÓÃÄã ýÈ磬 ãʹÓÃÕâЩÔË·ûÀ´Ñ¡ñÌض¨µ¼Ç£ ¬ AND Èç À´ÏÞÖƲéѯ½á¹û¡£ ¹ûÄãÖ´ÐÒ»¸ö¶Ô Active Sever Pages AND SQL ËÑ÷¡£µÄ µ½ÆäÃèÊöÖÐͬ±°üºÄã« Active Sever Pages ºÍ SQL µÄ¼Ç¡£±ãÐèÒªÏÞÖƲéѯ½á¹ûʬ¿ÉÔÓà AND¡£ Äã¿ÉÒÔʹÓÃÂß¼-²Ù×÷·û ÐèªÀ©Õéѯµ½á£¬Èç OR¡Èç¹ûÄãÖ´ÐÒ»¸öËÑ÷£¬ Àý £ ËÑ÷ùÓеÄÆäÃèÊöÖ°üº¬ Active Sever Pages OR SQL µã£¬ÄÊÕ½ÁбíÖ«°üÀ¨Ëù¾ ÓÐÆäÃèÊöÖͬ±°üºÁ½¸í´ï»òÈÎÒµÄվ㡣 Ïë´ÓËÑ÷½á¹ûÖÐųýÌض¨µÄվ㣬¿ÉÒÔÊÃÈç NOT¡²éѯ¡°Active Sever £ÀýÈç¬ Pages ¡±AND NOT ¡°SQL¡±½«·µ»ØÒ¸öÁÐí£¬ÖÄÕ¾ã°üº Active Sever Pages£¬µ« ²»°üº¬ SQL¡£µ±ØÐëųý̶¨Ä¼ÇÂʬã¿ÉÒÔ¹Óà NOT¡£ Óà SQL ִеIJéѯÓëà Internet ִеÄËÑ÷·Ç³£ÏàÆ¡Òýæ µ±ÄãÖ´ÐÒ»¸ö SQL ´Ëʱ²éѯ½á¹ûÇ Äã¿ÉÒԵý»¸ö¼ÇÂÁÐ±í¡£ ͨ¹ýÊÓðüÀÂß¼-ÔËã·ûµÄ²éѯÌõþ£¬ ²éѯʱ£¬ À´×ÔÒ»¸öò¶à±í¡£
  5. 5. SQL ¼ÙÉèÓÐÒ»¸öÃûΪ µÄ¾ä·¨Ç³£ò¥¡²éѯ email_table °üº¬Ãû×Ö͵طÁ½¸ö Ä±í£ ¶Î£¬ÒªµÃ½ Bill Gates µÄ e_mail µØÖ·, Äã¿ÉÒÔʹÓÃÏÂæµ²éѯ£º SELECT email from email_table WHERE name="Bill Gates" ²éѯִÐʱ£¬¾ÍÓÃûΪµÕâ¸ö email_table µÄ±íÖжÁÈ¡ Bill Gates µÄ e_mail £·¡Öص Õâ¸ö¼òµ¥ÄÓï¾ä°üÀ¨Èý²¿·Ö£º SELECT µÚÒ»²¿·Ö¸ÃûªÑ¡ÈÄÁУԴËÀý¬Óï¾ä ¡ö email È¡£µ±Ö´ÁÐ»Ñ Ð Ê±£¬Ö»ÏÔ¾ email ÁеÄÖ billg@microsoft.com ¡£ ¡ö SELECTT Òª²éѯµÄ ÔÚ´ËÀýÖУ¬ ʾݡ±í ¨© µÚ¶þ²¿·Ö¸Ã÷Òª´ÓÄöïä ±íÃûΪ email_table ¡£ ¡ö ¬ ó£ º î × SELECT Óï¾äµÄ WHERE ×Ó¾äÖ¸Ã÷ҪѡÔñÂúãʲ´Ìõ¼þµÄÇ£ÚËÀýЬé ѯÌõ¼þΪֻÓÐ name ÁеÄÖΪ Bill Gates µÄ¼Ç²ű»Ñ¡È£ Bill Gates ӵв»Ö¹Ò¸öºÜ¿ÉÄ email £·¡Öص Èç¹û±íÖаüº¬ Bill Gates µÄ¶à¸ö email µÄÓÃÉÏÊö µØÖ·¡£ SELECT ¾ä¿ÉÒÔ¶ÁÈ¡ËûùÓеÄï email ¡£µØÖ· SELECT ÖÐÈ¡³öËùÓ±íï¾ä´ name ×ֶεª Bill Gates µÄ¼Ç email ×ֶεġ£ Ç°Ãæ˵¹ý£¬²éѯ¿ÉÒÔ Ú²éѯÌõ¼þÖаüº¬Âß¼-ÔË ã·û¡£¼ÙÈçÄãÏë¶ÁÈ¡ Bill Gates »ò Clinton ×ÜͳµÄËùÓÐ email µØÖ·£¬Äã¿ÉÒÔʹÓÃÏÂæ²éѯï¾äº SELECT email FROM email_table WHERE name="Bill Gates" OR name="president Clinton" µÄ²éѯÌõ¼þ±ÈÇ°Ò»¸ö´ÔÓÁËã¡£Õâï¾äíÀýÖÐ email_table ËùÓÐÖÑ¡³ö name ÁÐΪ Bill Gates »ò president Clinton Èç¹û±íÖк¬Ó¼Ç¡£µÄ Bill Gates »ò president Clinton µÄ¶à¸öØÖ·£¬ËùÓм±»ÁÈ¡ SELECT Óï¾äµÄ½á¹¿´ÆðÀºÜÖ±Û¡£ÈçûãÇëÒ»¸öÅóÑíÐΪÔñ×é¼Â¬ ÔÚ ÄãÒ²Ðí·Ç³£ÏàËƵ½ÊÌáöªó¡ SQL SELECT ¡°SELECT Äã ÖУ¬Óï¾ä ÁÐÌض¨µÄ FROM Ò»¸ö±í WHERE ijЩÁÂú×ãÒ»¸öÌض¨µõ¼þ¡± ¡£ ½«éÉÜÔõÑùÖ´ÐÏÂÒ»Ú SQL ѯÀ´¡È¼Ç£Õ⽫°ïÖúÄãÊìϤÓòé SELECT ±íÖÐÈ¡Óï¾ä´ Êý¾ÝµÄ¸÷Ö²»Í¬·½¨¡£ ʹÓà ISQL Ö´Ð SELECT ²éѯ ×°µ±Äã² SQL Sever ʱ£¬ÄãÍ°²×ÁËÒ»¸ö½Ð÷ ISQL/w µÄӦóÌÐò¡£ISQL/w ÐíÄãÖ´ÔÊ Ð½»¥µÄ SQL ²éѯ¡£ÔÚ°üÀ¨µ½Äã ASP Ò³ÖЮǰ£¬ÓÃÍø ISQL/w Æä½øвâÊÔÇ·³£¶ ÓÐõġ£ ×¢Ò⣺ ÔÚÕâ±¾ÊéµÄÒ»²¿·Ý£¬ãѧϰÁËõù׺ÍÅäÖà Microsoft SQL Sever ¡£Èç¹ûûÓа² ×° SQL Sever »òÕß SQL Sever ²»ÄÜÔËУ¬ÇëεÚÈýÕ¡°×ºÍʹÓà SQL Sever¡± ¡£ ÎñÉÏÑ¡ÔÈ SQL Sever µÄ³ÌÐò×éÖ ISQL_w Æô¶¯¸Ã³ÌÐò¡£Ê±¬×ÏÈ»áöÖÒÔ £¨¼ûÍ ÒªÇóÊäÈë·þÎñÆ÷ÐÅÏ¢ºµÂ ¸ö¶Ô»°¿ò¬ 10.1£© Ú Ô £ ¡ Sever ÊäÈëÄãµ ÖУ¬¿ò SQL ·þ ÔڵǼ ·þÎñÆ÷Ãû×Ö¾ÍÊÇÄã¼Ë»úµ¡£ Èç¹û·þÎñÆ÷ÕýÔËÐÚ±¾µØ¼ã»úÉÏ£¬ ÎñÆ÷µÄÃû×Ö¡£
  6. 6. Connect °´Å¥¡£ ͼ 10¡£1 ×¢Ò⣺ ½«Èç¹ûÄã SQL Sever Èç¹û ÄÇôã¿ÉÒÔÊÓÐÅÁ¬½¡£ äÖΪ¹ÍêÕû°²È«»òìºÏ ÄãʹÓñê×¼°²È«£¬ÔòÐèÒªÌá©»§ÕºÅÍÜÂë¡Á˽â¸ü¶àÏ¢ÎûµÚý Èçͼ ÔÚÄãµ¥»÷Á¬½Ó°´Åºóá³öÏÖÒ¸²éѯ¿£ ÇÐÕý³£¬Èç¹ûÒ» 10.2 Ëùʾ¡£ Èç¹ûÓÐÒ죨 ³£¬Çë²Î¿¼µÚÈýÕ© ͼ 10.2 ÔÚִвéѯ®Ç°£¬ÄãèÒª¡ñÊý¾Ý¿â× SQL Sever ʱÄãÒÑΪ×Ô¼º´½¨ÁË»¸öý¾Ý ¿â£¬SQL Sever »¹ÓÐí¶àϵͳÊý¾Ý¿â£¬Èç master£¬model£¬msdb£¬ºÍ tempdb¡£ ÊÇ£¬·½±ãµÄ SQL Sever ÊâµÄÃûΪ´øÓÐÒ»¸öÌØ pubs ¿â ¡£µÄÀý×ÓÊ¾Ý pubs Öаüº¬¹©Ò»¸ö ±¾ÊéÖеÄí ÎĵÖÐËùÓÀý׳Ìò¶¼ÊÇÕëÔâ¸ö¿´ÉèÆ¡£ ÐéÄâµ³ö°æÉÌʹÓø÷±í¡£ ¶àÀý×ÓҲʹÃÕâ¸ö¾Ý¿¡£ ´°¿Ú¶¥²µÄÔéѯ DB ÔñÊý¾Ý¿âÏÂÀ-òÖÐÑ¡ pubs£ÄãËùÓе²é ÕâѾ͡ÔñÁÊýÝ¿£ ¬ ѯ¶¼½«ÕëÔâ¸ö¿ÖеÄ÷±íÀ´¡£ÏÚãÉÒ»²éÁËæÈÃ·Ü Ò»¸ö²éѯ½«Õë¶ÔÃûΪÄãµÚ autrors±íÖаüº¬ËùÓΪij¸öéâæÉ̹¤×÷µ µÄ±í£¬ ×÷ÕßµÄÏà¹ØÊý¾Ý¡£¥»²éѯ´°¿Ú¢äÈëÒÔÂÓïº SELECT phone FROM authors WHERE au_name="Ringer" ³Éºó£¬µ¥»÷ִвéѯ°Å¨Ò¸öÂÌ«Èý½ÇοÆðÀÏñÊäëÍê VCR ²¥·Å¼ü£© µ¥»÷´Ë°¡£ Äã¿É ²éѯ´°¿Ú»á×Ô¶±ä³É½¹ûÏʾ£¬ Èκ³öÏÖÔÚ²éѯ´°¿ÐµÄÓï¾äù»á±¡£ Å¥ºó£¬ ÒÔ¿´µ½²éѯÄá¹û£¨¼Í 10.3£© ¡£ µÄ²éѯ½á¹ûÒÐíÓëͼ㿴 10.3 ͬ¡£ÔÚËùʾµÄ²» SQL Sever ͬ°æ±¾ÖУ¿âµÄ²» pubs ÖеÄÊý¾Ý»áÓËù²Í¬¡£¶Ô SQL Sever 6.5 »áÕÒµ½ÁÌõ¼Ç¡£¹ûÏÔʾ´°¿ÚÖÐÓ¦Àˬ« ÈçÏÂÄÚÝ£º phone ………………. 801 826_0752 801 826_0752 (2 row(s) affected)
  7. 7. ͼ 10.3 еÄãËùÖ´ SELECT Óï¾ä´±í authors ËùÓÐÃû×ÖΪȡ³ö RingerÄã µÄç»°ºÅÂë¡£×÷Õß Í¨¹ýÔÚ WHERE´Ó±í ÄãÒ²¿ÉÔºöÂÑ¡ñÌõ¼þ£¬ ÌØÊâµÄÑ¡Ôñõ¼þÀ´ÏÞÖƲ鯽á¹û£×Ó¾äÐà µ¥»÷ Òª×öµ½Õâ»ã£¬ ÖÐÈ¡³öËùÓ×÷ÕßµÄç»°ºÅÂë£ Query ÊäÈëÒÔÏ ·µ»Ø½²éѯ´°¿Ú£¬ ±êÇ©£¬ µÄ SELECT Óï¾ä£º SELECT Phone FROM authors Õ â ¸ ö ² éÑ ¯ Ö ´ Ð º ó £ ¬ » á È ¡ ³ ö ± í authors ÖеÄË¡ù£ÓÈç¹û»°±ºíÅÂ루ûÓÐÌض¨µÄ˳Ðò£© authors Õâ Èç¹û±íÖÐÓÊ®ÒÚ¸öµ»°ºÅÂ룬 áټǡ³ º¬Ò»°¸öµçÅÂë£ÖÐü ¡£ Ê®ÒÚÌõ¼Ç¶»á±È¡³ö£¨Õâ²Ðíèª©ä ±í authrsµµ³Öͨ¹ýÔÚ ÝºÍÓÊÕþ±àÂë¡£ ÇÊУ¬ ØÖ·£¬ ç»°ºÅÂ룬 Ãû×Ö£¬ ÐÕ£¬µÄ×ֶΰüÀ¨ SELECT Óï¾äµÄÚÒ»²¿·ÝÖ¸¶¨ËüÃÇ£¬ãÉÔ´±íÐÈ¡³öÎº× SELECT Óï¾äÖÐ Ò»´ÎÈ¡³ö¶à¸×Ö£¬±çº SELECT au_fname ,au_lname, phone FROM authors Õâ¸ö SELECT ºó£¬½«È¡³öÕâý¸ÁеÄËùÓÖÏÂÃæÊDzéѯá¹ûÒ»¾ïä´ £º Àý£¨ÎªÁ˽ÚÊ¡ÖÕŬ»ÏÔ¾²éѯá¹ûµÄÒ¿·ÆäÓà¼ÇÂú´úÌæ© au_fname au_lname phone …………………………………………………………………………. Johnson White 408 496_7223 Marjorie Green 415 986_7020 Cheryl Carson 415 548_7723 Michael O’Leary 408 286_2428 … (23 row(s) affected) ÔÚ SELECT ÐèÒªÁ³ö¶àÉÙ¸×ÖΣ¬Äã¾Í¿Ô¡²»üË°ÑÃûÓïä £¨* ÄãÒ²¿ÉÔÓÃÐǺŠ¶ºÅ¸ô¿ª¡£ ÕâÀïÓÐÒ»¸öʹÃǺŵÄý×£ Ò»¸ö±íÖÐÈ¡³ËùÓµÄ׶Σ´ £© SELECT * FROM authors Õâ¸ö SELECT ºó£¬±íÖеÄËùÓ׶μ»È¡³öãᷢϽ«ÔÚï¾ä´ SQL ²éѯÖРƵ·±Ê¹ÓÃÐǺš£ ¼ÇÉ£º Ö»ÐèÒªÔÚ´Íê Òª×öµ½Õâ»ã£¬ ʹÓÃÐǺÅÀ´²é¿Ò»¸ö±íµÄËùÁû×Ö¡£ãÉÔ SELECT Óï¾äºó¿´Ò»Ï²éѯ½á¹ûµÄÁбêÌâ¡£
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