尊龙凯时人生就是搏

sqlÖÐɾ³ýÁеÄÏÂÁî

sql ÖÐɾ³ýÁеÄÏÂÁîΪ alter table drop column£¬ÓÃÓÚÐ޸ıí½á¹¹£¬É¾³ýÖ¸¶¨ÁС£°ì·¨°üÀ¨£º1. Ö¸¶¨ÒªÐ޸ĵıíÃû£»2. ʹÓà drop column ×Ó¾äÖ¸¶¨ÒªÉ¾³ýµÄÁÐÃû¡£

SQL ÖÐɾ³ýÁеÄÏÂÁî

SQL ÖÐɾ³ýÁеÄÏÂÁîÊÇ ALTER TABLE£¬ËüÔÊÐíÐ޸ıí½á¹¹£¬°üÀ¨É¾³ýÁС£

Óï·¨£º

ALTER TABLE table_name DROP COLUMN column_name;

µÇ¼ºó¸´ÖÆ

°ì·¨£º

Ö¸¶¨ÒªÐ޸ĵıíÃû table_name¡£

ʹÓà DROP COLUMN ×Ó¾äÖ¸¶¨ÒªÉ¾³ýµÄÁÐÃû column_name¡£

ʾÀý£º

¼ÙÉèÓÐÒ»¸öÃûΪ employee µÄ±í£¬Ëü°üÀ¨ÒÔÏÂÁУº

ÁÐÃû Êý¾ÝÀàÐÍ
id int
name varchar(255)
age int
address text

Ҫɾ³ý address ÁУ¬¿ÉÒÔʹÓÃÒÔÏÂÏÂÁ

ALTER TABLE employee DROP COLUMN address;

µÇ¼ºó¸´ÖÆ

×¢ÖØ£º

Ö»ÄÜɾ³ý±íÖв»±£´æÍâ¼üÔ¼ÊøµÄÁС£

ɾ³ýÁн«ÓÀÊÀɾ³ý¸ÃÁÐÖд洢µÄËùÓÐÊý¾Ý¡£

È·±£ÔÚɾ³ýÁÐ֮ǰ±¸·Ý±í£¬ÒÔ·ÀÍòÒ»±¬·¢Êý¾ÝɥʧµÄÇéÐΡ£

ÒÔÉϾÍÊÇsqlÖÐɾ³ýÁеÄÏÂÁîµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡

ÃâÔð˵Ã÷£ºÒÔÉÏչʾÄÚÈÝȪԴÓÚÏàÖúýÌå¡¢ÆóÒµ»ú¹¹¡¢ÍøÓÑÌṩ»òÍøÂçÍøÂçÕûÀí£¬°æȨÕùÒéÓë±¾Õ¾Î޹أ¬ÎÄÕÂÉæ¼°¿´·¨Óë¿´·¨²»´ú±í尊龙凯时人生就是搏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尊龙凯时人生就是搏ʵʱÐÞÕý»òɾ³ý¡£

Ïà¹ØÐÂÎÅ

ÁªÏµ尊龙凯时人生就是搏

18523999891

¿É΢ÐÅÔÚÏß×Éѯ

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

QR code
sitemap¡¢ÍøÕ¾µØͼ