尊龙凯时人生就是博

sqlÖÐlikeÌåÏÖʲô

sql like ÔËËã·ûÓÃÓÚ¾ÙÐÐģʽƥÅ䣬Óï·¨ÊÇ select * from table_name where column_name like pattern; ģʽ¿ÉÒÔʹÓÃͨÅä·û %£¨í§Òâ×Ö·û£©ºÍ _£¨µ¥¸ö×Ö·û£©£¬Ö§³ÖתÒå×Ö·û¡¢×Ö·û¹æÄ£ºÍ not like ·ñ¶¨Æ¥Åä¡£µ«Òª×¢ÖØ like ÔËËã·ûÇø·Ö¾Þϸд£¬¹ØÓÚ´óÊý¾Ý±í¿ÉÄܽÏÂý¡£

SQL ÖÐ LIKE ÔËËã·û

LIKE ÔËËã·ûÓÃÓÚÔÚ SQL ÅÌÎÊÖоÙÐÐģʽƥÅä¡£Ëü¼ì²é×Ö·û´®ÊÇ·ñÓë¸ø¶¨µÄģʽƥÅä¡£

Óï·¨£º

SELECT * FROM table_name WHERE column_name LIKE pattern;

µÇ¼ºó¸´ÖÆ

ģʽ£º

ģʽ¿ÉÒÔ°üÀ¨ÒÔÏÂͨÅä·û£º

%£ºÆ¥Åäí§ÒâÊýÄ¿µÄ×Ö·û£¨°üÀ¨ 0 ¸ö×Ö·û£©¡£

_£ºÆ¥Åäµ¥¸ö×Ö·û¡£

ʾÀý£º

LIKE ‘dog%’£ºÆ¥ÅäÒÔ “dog” ¿ªÍ·µÄÈκÎ×Ö·û´®¡£

LIKE ‘%dog’£ºÆ¥ÅäÒÔ “dog” ×îºóµÄÈκÎ×Ö·û´®¡£

LIKE ‘%dog%’£ºÆ¥Åä°üÀ¨ “dog” µÄÈκÎ×Ö·û´®¡£

LIKE ‘d_g’£ºÆ¥Åä°üÀ¨ “d” ºÍ “g”£¬ÖÐÐÄÓÐÒ»¸öí§Òâ×Ö·ûµÄÈκÎ×Ö·û´®¡£

¸ß¼¶Ó÷¨£º

³ýÁËͨÅä·ûÖ®Í⣬LIKE ÔËËã·û»¹Ö§³ÖÆäËû¸ß¼¶Ó÷¨£º

תÒå×Ö·û£ºÔÚģʽÖÐʹÓ÷´Ð±¸Ü () תÒåÌØÊâ×Ö·û£¨Èç % ºÍ _£©¡£

×Ö·û¹æÄ££ºÊ¹Ó÷½À¨ºÅ ([ ]) ½ç˵×Ö·û¹æÄ£¡£ÀýÈ磬[a-z] Æ¥ÅäÈκÎСд×Öĸ¡£

·ñ¶¨£ºÊ¹Óà NOT LIKE ÔËËã·û²éÕÒ²»Æ¥Åä¸ø¶¨Ä£Ê½µÄ×Ö·û´®¡£

×¢ÖØÊÂÏ

LIKE ÔËËã·ûÇø·Ö¾Þϸд¡£

LIKE ÔËËã·û¹ØÓÚ°üÀ¨´ó×ÚÊý¾ÝµÄ±í¿ÉÄÜ»áºÜÂý¡£

ÔÚijЩÇéÐÎÏ£¬Ê¹Óà REGEXP ÔËËã·û¿ÉÄÜ±È LIKE ÔËËã·û¸üÓÐÓá£

ÒÔÉϾÍÊÇsqlÖÐlikeÌåÏÖʲôµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡

ÃâÔð˵Ã÷£ºÒÔÉÏչʾÄÚÈÝȪԴÓÚÏàÖúýÌå¡¢ÆóÒµ»ú¹¹¡¢ÍøÓÑÌṩ»òÍøÂçÍøÂçÕûÀí£¬°æȨÕùÒéÓë±¾Õ¾Î޹أ¬ÎÄÕÂÉæ¼°¿´·¨Óë¿´·¨²»´ú±í尊龙凯时人生就是博ÂËÓÍ»úÍø¹Ù·½Ì¬¶È£¬Çë¶ÁÕß½ö×ö²Î¿¼¡£±¾ÎĽӴýתÔØ£¬×ªÔØÇë˵Ã÷À´ÓÉ¡£ÈôÄúÒÔΪ±¾ÎÄÇÖÕ¼ÁËÄúµÄ°æȨÐÅÏ¢£¬»òÄú·¢Ã÷¸ÃÄÚÈÝÓÐÈκÎÉæ¼°ÓÐÎ¥¹«µÂ¡¢Ã°·¸Ö´·¨µÈÎ¥·¨ÐÅÏ¢£¬ÇëÄúÁ¬Ã¦ÁªÏµ尊龙凯时人生就是博ʵʱÐÞÕý»òɾ³ý¡£

Ïà¹ØÐÂÎÅ

ÁªÏµ尊龙凯时人生就是博

18523999891

¿É΢ÐÅÔÚÏß×Éѯ

ÊÂÇéʱ¼ä£ºÖÜÒ»ÖÁÖÜÎ壬9:30-18:30£¬½ÚãåÈÕÐÝÏ¢

QR code
sitemap¡¢ÍøÕ¾µØͼ