sqlÖÐÔõÑùÐÞ¸ÄÊý¾Ý
sql ÖÐÐÞ¸ÄÊý¾ÝÓÐÈýÖÖÖ÷ÒªÒªÁ죺update Óï¾ä£ºÐÞ¸ÄÏÖÓÐÊý¾Ý£¬Ö¸¶¨Òª¸üеÄÁкÍÌõ¼þ¡£insert Óï¾ä£º²åÈëÐÂÐУ¬Ö¸¶¨Òª²åÈëµÄÁкÍÖµ¡£delete Óï¾ä£ºÉ¾³ýÖ¸¶¨Ìõ¼þµÄÐС£
ÔÚ SQL ÖÐÐÞ¸ÄÊý¾Ý
ÔÚ SQL£¨½á¹¹»¯ÅÌÎÊÓïÑÔ£©ÖУ¬Óм¸ÖÖÒªÁì¿ÉÒÔÐÞ¸ÄÊý¾Ý¿âÖеÄÊý¾Ý£º
UPDATE Óï¾ä£º
UPDATE Óï¾äÓÃÓÚÐÞ¸ÄÏÖÓбíÖеÄÊý¾Ý¡£Óï·¨ÈçÏ£º
UPDATE table_name SET column_name = new_value WHERE condition;
µÇ¼ºó¸´ÖÆ
table_name£ºÒª¸üÐÂÊý¾ÝµÄ±íÃû¡£
column_name£ºÒª¸üеÄÁÐÃû¡£
new_value£ºÒªÉèÖõÄÐÂÖµ¡£
WHERE condition£ºÖ¸¶¨Òª¸üеÄÐеÄÌõ¼þ¡£
ʾÀý£º
¸üÐÂÃûΪ “customers” ±íÖÐµÄ “address” ÁУ¬½« “John Doe” µÄµØµã¸üÐÂΪ “123 Main Street”£º
UPDATE customers SET address = '123 Main Street' WHERE name = 'John Doe';
µÇ¼ºó¸´ÖÆ
INSERT Óï¾ä£º
INSERT Óï¾äÓÃÓÚÏò±íÖвåÈëÐÂÐС£Óï·¨ÈçÏ£º
INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);
µÇ¼ºó¸´ÖÆ
table_name£ºÒª²åÈëÊý¾ÝµÄ±íÃû¡£
column1, column2, …£ºÒª²åÈëÊý¾ÝµÄÁÐÃû¡£
value1, value2, …£ºÒª²åÈëµÄÖµ¡£
ʾÀý£º
ÏòÃûΪ “orders” µÄ±íÖвåÈëÐÂÐУº
INSERT INTO orders (customer_id, product_id, quantity) VALUES (1, 5, 2);
µÇ¼ºó¸´ÖÆ
DELETE Óï¾ä£º
DELETE Óï¾äÓÃÓÚ´Ó±íÖÐɾ³ýÐС£Óï·¨ÈçÏ£º
DELETE FROM table_name WHERE condition;
µÇ¼ºó¸´ÖÆ
table_name£ºÒª´ÓÖÐɾ³ýÊý¾ÝµÄ±íÃû¡£
condition£ºÖ¸¶¨ÒªÉ¾³ýµÄÐеÄÌõ¼þ¡£
ʾÀý£º
´ÓÃûΪ “products” µÄ±íÖÐɾ³ý²úÆ· ID Ϊ 10 µÄÐУº
DELETE FROM products WHERE product_id = 10;
µÇ¼ºó¸´ÖÆ
ÒÔÉϾÍÊÇsqlÖÐÔõÑùÐÞ¸ÄÊý¾ÝµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡