在本教程中将学习如何使用Oracle UPDATE
语句来更改表中的已存在值。
要更改表中已存在的值,请使用以下Oracle UPDATE
语句:
UPDATE table_name SET column1 = value1, column2 = value2, column3 = value3, ... WHERE condition;
下面让我们来创建一个包含示例数据的新表。
首先,下面的CREATE TABLE语句创建一个名为parts
的新表:
-- oracle 12c的写法 CREATE TABLE parts ( part_id NUMBER GENERATED BY DEFAULT AS IDENTITY, part_name VARCHAR(50) NOT NULL, lead_time NUMBER(2,0) NOT NULL, cost NUMBER(9,2) NOT NULL, status NUMBER(1,0) NOT NULL, PRIMARY KEY (part_id) ); -- oracle 11g的写法 drop sequence parts_seq; create sequence parts_seq increment by 1 start with 1 maxvalue 9999999999 nocache; drop table parts; CREATE TABLE parts ( part_id NUMBER, part_name VARCHAR(50) NOT NULL, lead_time NUMBER(2,0) NOT NULL, cost NUMBER(9,2) NOT NULL, status NUMBER(1,0) NOT NULL, PRIMARY KEY (part_id) );
其次,以下INSERT
语句将示例数据添加到parts
表中:
-- oracle 11g的插入数据写法 INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'sed dictum',5,134,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'tristique neque',3,62,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'dolor quam,',16,82,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'nec, diam.',41,10,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'vitae erat',22,116,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'parturient montes,',32,169,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'metus. In',45,88,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'at, velit.',31,182,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'nonummy ultricies',7,146,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'a, dui.',38,116,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'arcu et',37,72,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'sapien. Cras',40,197,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'et malesuada',24,46,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'mauris id',4,153,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'eleifend egestas.',2,146,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'cursus. Nunc',9,194,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'vivamus sit',37,93,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'ac orci.',35,134,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'arcu. Aliquam',36,154,0); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'at auctor',32,56,1); INSERT INTO parts (part_id,part_name,lead_time,cost,status) VALUES (parts_seq.nextval,'purus, accumsan',33,12,1);
Oracle 12c 插入数据语句 -
-- oracle 12c写法 INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('sed dictum',5,134,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('tristique neque',3,62,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('dolor quam,',16,82,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('nec, diam.',41,10,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('vitae erat',22,116,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('parturient montes,',32,169,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('metus. In',45,88,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('at, velit.',31,182,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('nonummy ultricies',7,146,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('a, dui.',38,116,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('arcu et',37,72,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('sapien. Cras',40,197,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('et malesuada',24,46,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('mauris id',4,153,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('eleifend egestas.',2,146,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('cursus. Nunc',9,194,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('vivamus sit',37,93,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('ac orci.',35,134,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('arcu. Aliquam',36,154,0); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('at auctor',32,56,1); INSERT INTO parts (part_name,lead_time,cost,status) VALUES ('purus, accumsan',33,12,1);
现在,查询上面创建的parts
表中的数据 -
以下UPDATE
语句更改ID
为3
的零件的成本:
UPDATE parts SET cost = 130 WHERE part_id = 3;
要验证更新,请使用以下查询:
SELECT * FROM parts WHERE part_id = 3;
执行上面查询语句,得到以下结果 -
以下语句更新ID
为6
的零件的前置时间,成本和状态。
UPDATE parts SET lead_time = 30, cost = 120, status = 1 WHERE part_id = 6;
要验证更新,请使用以下查询:
SELECT * FROM parts WHERE part_id = 6;
执行上面查询语句,得到以下结果 -
以下声明增加了parts
表中所有零件的成本5%
:
UPDATE parts SET cost = cost * 1.05;
执行上面查询语句后,再次查询每个零件的成本 -
在本教程中,您已学习如何使用Oracle UPDATE
语句更改表中的现有值。