尊龙凯时人生就是搏

sqlÖÐÓÃÓÚÅÌÎʵÄÏÂÁî

sql ÖеÄÅÌÎÊÏÂÁîÓÃÓÚ´ÓÊý¾Ý¿âÖмìË÷Êý¾Ý£¬×î³£ÓõÄÏÂÁîÊÇ select£¬Ëü»ùÓÚ where Ìõ¼þ´Ó±íÖлñÈ¡Ìض¨Ãü¾Ý¡£ÆäËû³£ÓõÄÅÌÎÊÏÂÁ°üÀ¨ insert£¨²åÈëÐÂÐУ©¡¢update£¨¸üÐÂÏÖÓÐÖµ£©¡¢delete£¨É¾³ýÐУ©¡£

SQL ÖÐÓÃÓÚÅÌÎʵÄÏÂÁî

SQL£¨½á¹¹»¯ÅÌÎÊÓïÑÔ£©ÖУ¬ÅÌÎÊÏÂÁîÓÃÓÚ´ÓÊý¾Ý¿âÖмìË÷Êý¾Ý¡£×î³£ÓõÄÅÌÎÊÏÂÁîÊÇ SELECT£¬ÓÃÓÚ´Ó±íÖлñÈ¡Ìض¨ÐкÍÁС£

SELECT ÏÂÁîÓï·¨£º

SELECT column1, column2, ...
FROM table_name
WHERE condition;

µÇ¼ºó¸´ÖÆ

²ÎÊý˵Ã÷£º

column1, column2, …£ºÒª¼ìË÷µÄÁÐÃû¡£

table_name£ºÒªÅÌÎʵıíÃû¡£

WHERE condition£ºÓÃÓÚ¹ýÂËЧ¹ûµÄ¿ÉÑ¡Ìõ¼þ¡£

ÆäËû³£ÓõÄÅÌÎÊÏÂÁ

INSERT£ºÏò±íÖвåÈëÐÂÐС£

UPDATE£º¸üбíÖÐÏÖÓÐÐеÄÖµ¡£

DELETE£º´Ó±íÖÐɾ³ýÐС£

ÅÌÎÊÏÂÁîʾÀý£º

´Ó “Students” ±íÖÐÑ¡Ôñ “name” ºÍ “age” ÁУº

SELECT name, age
FROM Students;

µÇ¼ºó¸´ÖÆ

´Ó “Orders” ±íÖÐÑ¡Ôñ¼ÛÇ®´óÓÚ 100 µÄËùÓÐÐУº

SELECT *
FROM Orders
WHERE price > 100;

µÇ¼ºó¸´ÖÆ

Ïò “Students” ±íÖвåÈëÒ»ÐУº

INSERT INTO Students (name, age)
VALUES ('John Doe', 21);

µÇ¼ºó¸´ÖÆ

¸üР“Orders” ±íÖÐÌض¨¶©µ¥µÄ¼ÛÇ®£º

UPDATE Orders
SET price = 150
WHERE order_id = 1;

µÇ¼ºó¸´ÖÆ

´Ó “Products” ±íÖÐɾ³ýÌض¨²úÆ·£º

DELETE FROM Products
WHERE product_id = 10;

µÇ¼ºó¸´ÖÆ

ÒÔÉϾÍÊÇsqlÖÐÓÃÓÚÅÌÎʵÄÏÂÁîµÄÏêϸÄÚÈÝ£¬¸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