sqlÖÐÐÞ¸ÄÊý¾ÝµÄÏÂÁî
sql ÖÐʹÓà update ºÍ delete ÏÂÁîÐÞ¸ÄÊý¾Ý£ºupdate ÏÂÁî¸üÐÂÏÖÓмͼ£¬Ó﷨Ϊ£ºupdate table_name set column1 = value1, column2 = value2, … where condition;delete ÏÂÁîɾ³ý¼Í¼£¬Ó﷨Ϊ£ºdelete from table_name where condition;Îñ±ØÉóÉ÷ʹÓã¬ÓÉÓÚËüÃÇÊÇÆÆËðÐÔ²Ù×÷£¬Ê¹Óà where ×Ó¾äÖ¸¶¨Ìõ¼þÒÔÖ»¸üлòɾ³ýÌض¨ÐС£
SQL ÖÐÐÞ¸ÄÊý¾ÝµÄÏÂÁî
SQL ÖÐʹÓà UPDATE ºÍ DELETE ÏÂÁîÀ´ÐÞ¸ÄÊý¾Ý¡£
UPDATE ÏÂÁî
UPDATE ÏÂÁîÓÃÓÚ¸üбíÖеÄÏÖÓмͼ¡£ÆäÓ﷨Ϊ£º
UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;
µÇ¼ºó¸´ÖÆ
table_name£ºÒª¸üеıíÃû¡£
column1, column2, …£ºÒª¸üеÄÁÐÃû¡£
value1, value2, …£ºÒª¸üеÄÐÂÖµ¡£
condition£ºÖ¸¶¨Òª¸üеÄÐеÄÌõ¼þ£¬Ä¬ÒÔΪ¸üÐÂËùÓÐÐС£
ʾÀý£º
UPDATE customers SET name = 'John Doe', email = 'john.doe@example.com' WHERE id = 12345;
µÇ¼ºó¸´ÖÆ
´ËÅÌÎʽ«¿Í»§ ID Ϊ 12345 µÄ¼Í¼¸üÐÂΪÃû³ÆΪ “John Doe”¡¢µç×ÓÓʼþΪ “john.doe@example.com”¡£
DELETE ÏÂÁî
DELETE ÏÂÁîÓÃÓÚ´Ó±íÖÐɾ³ý¼Í¼¡£ÆäÓ﷨Ϊ£º
DELETE FROM table_name WHERE condition;
µÇ¼ºó¸´ÖÆ
table_name£ºÒª´ÓÖÐɾ³ý¼Í¼µÄ±íÃû¡£
condition£ºÖ¸¶¨ÒªÉ¾³ýµÄÐеÄÌõ¼þ£¬Ä¬ÒÔΪɾ³ýËùÓÐÐС£
ʾÀý£º
DELETE FROM orders WHERE order_date <p>´ËÅÌÎʽ«É¾³ýËùÓÐÈÕÆÚÔçÓÚ 2021 Äê 1 Ô 1 ÈյĶ©µ¥¡£</p><h3>×¢ÖØ</h3>
µÇ¼ºó¸´ÖÆ
ÔÚʹÓà UPDATE ºÍ DELETE ÏÂÁîʱ£¬ÇëÉóÉ÷£¬ÓÉÓÚËüÃÇÊÇÆÆËðÐԵIJÙ×÷¡£
ʼÖÕÈ·±£ÔÚÖ´ÐÐÐÞ¸ÄÊý¾Ý²Ù×÷֮ǰ±¸·ÝÊý¾Ý¿â¡£
ʹÓà WHERE ×Ó¾äÖ¸¶¨Ìõ¼þÒÔÖ»¸üлòɾ³ýÌض¨ÐС£
ÒÔÉϾÍÊÇsqlÖÐÐÞ¸ÄÊý¾ÝµÄÏÂÁîµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡