尊龙凯时人生就是博

mysqlÖÐcolumnº¯ÊýÊÇʲôÒâ˼

mysql ÖÐµÄ column() º¯Êý·µ»ØÖ¸¶¨±íÖÐÖ¸¶¨ÁеÄÃû³Æ£¬ÓÃÓÚ¶¯Ì¬ÌìÉúÅÌÎÊ×Ö·û´®»ò´¦ÀíÔªÊý¾Ý¡£

ʲôÊÇ MySQL ÖÐµÄ COLUMN º¯Êý£¿

COLUMN() º¯ÊýÊÇÒ»¸öϵͳº¯Êý£¬ÓÃÓÚ·µ»ØÖ¸¶¨±íÖÐÖ¸¶¨ÁеÄÃû³Æ¡£

º¯ÊýÓï·¨£º

COLUMN(column_name)

µÇ¼ºó¸´ÖÆ

ÆäÖУº

column_name ÊÇÒª·µ»ØÆäÃû³ÆµÄÁÐÃû³Æ¡£

Ó÷¨£º

COLUMN() º¯Êý×î³£ÓÃÓÚ¶¯Ì¬ÌìÉú SQL ÅÌÎÊ×Ö·û´®»ò´¦ÀíÔªÊý¾Ý¡£¾ÙÀýÀ´Ëµ£º

SELECT COLUMN() FROM table_name;

µÇ¼ºó¸´ÖÆ

ÒÔÉÏÅÌÎʽ«·µ»Ø±í table_name ÖÐËùÓÐÁеÄÃû³Æ¡£

ALTER TABLE table_name CHANGE COLUMN OLD_NAME NEW_NAME INT;

µÇ¼ºó¸´ÖÆ

ÒÔÉÏÅÌÎÊʹÓà COLUMN() º¯ÊýÀ´¸ü¸Ä±í table_name ÖÐÁÐ OLD_NAME µÄÃû³ÆΪ NEW_NAME¡£

×¢ÖØ£º

COLUMN() º¯Êý·µ»ØµÄÃû³Æ¶Ô¾ÞϸдÃô¸Ð¡£

COLUMN() º¯ÊýÖ»ÄÜÓÃÓÚµ¥¸öÁС£

ÒÔÉϾÍÊÇmysqlÖÐcolumnº¯ÊýÊÇʲôÒâ˼µÄÏêϸÄÚÈÝ£¬¸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