尊龙凯时人生就是博

sqlÖÐÌåÏÖÅÌÎʵÄÏÂÁîÊÇʲô

ÔÚ sql ÖУ¬Ö´ÐÐÅÌÎʵÄÏÂÁîÊÇ select¡£select Óï¾äµÄÓï·¨°üÀ¨ÒÔÏÂ×é³É²¿·Ö£º1. select : Ö¸¶¨Òª¼ìË÷µÄÁÐ £»2. from : Ö¸¶¨¼ìË÷Êý¾ÝµÄ±í £»3. [where ]: ɸѡÅÌÎÊЧ¹ûµÄÐÐ £»4. [group by ]: ¶ÔЧ¹û·Ö×é £»5. [having ]: ¶Ô·Ö×éЧ¹ûɸÑ¡ £»6. [order

SQL ÖÐÌåÏÖÅÌÎʵÄÏÂÁîÊÇʲô £¿

ÔÚ SQL ÖУ¬ÓÃÓÚÖ´ÐÐÅÌÎʵÄÏÂÁîÊÇ SELECT¡£

SELECT Óï¾äµÄÓï·¨ÈçÏ£º

SELECT <column_list>
FROM <table_name>
[WHERE <condition>]
[GROUP BY <column_list>]
[HAVING <condition>]
[ORDER BY <column_list>]</column_list></condition></column_list></condition></table_name></column_list>

µÇ¼ºó¸´ÖÆ

SELECT Óï¾äµÄ×é³É²¿·Ö£º

SELECT £º Ö¸¶¨Òª´Ó±íÖмìË÷µÄÁС£

FROM £º Ö¸¶¨Òª´ÓÆä¼ìË÷Êý¾ÝµÄ±í¡£

WHERE £º £¨¿ÉÑ¡£©Ö¸¶¨ÒªÉ¸Ñ¡ÅÌÎÊЧ¹ûµÄÐС£

GROUP BY £º £¨¿ÉÑ¡£©Ö¸¶¨ÓÃÓÚ¶ÔЧ¹û¾ÙÐзÖ×éµÄÁС£

HAVING £º £¨¿ÉÑ¡£©Ö¸¶¨¶Ô·Ö×éЧ¹û¾ÙÐÐɸѡµÄÌõ¼þ¡£

ORDER BY £º £¨¿ÉÑ¡£©Ö¸¶¨ÓÃÓÚ¶ÔЧ¹ûÅÅÐòµÄÁС£

¾ÙÀý£º

ÒÔÏ SQL Óï¾ä¿É´Ó “students” ±íÖмìË÷ËùÓÐѧÉúµÄÐÕÃûºÍÄêË꣺

SELECT name, age
FROM students;

µÇ¼ºó¸´ÖÆ

ÒÔÉϾÍÊÇsqlÖÐÌåÏÖÅÌÎʵÄÏÂÁîÊÇʲôµÄÏêϸÄÚÈÝ£¬¸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

13452372176

¿É΢ÐÅÔÚÏß×Éѯ

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

QR code
sitemap¡¢ÍøÕ¾µØͼ