oracle update的使用方法

UPDATE语句的更新表中的数据。
　　
UPDATE语句的指定以下信息:
　　
　　这是改变的表名,一个地方记录被改变,列名称的列表,给他们新的内容值,根据指定条件,你可以改变一个或多个字段使用相同的更新。

语法

UPDATE "表格名"
SET "栏位1" = [新值]
WHERE {条件}

实例

SQL> -- create demo table
SQL> create table Employee(
2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
3    First_Name         VARCHAR2(10 BYTE),
4    Last_Name          VARCHAR2(10 BYTE),
5    Start_Date         DATE,
6    End_Date           DATE,
7    Salary             Number(8,2),
8    City               VARCHAR2(10 BYTE),
9    Description        VARCHAR2(15 BYTE)
10 )
11 /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,       Description)
2               values ('01','Jason',    'Martin', to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto', 'Programmer')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,       Description)
2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,       Description)
2                values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,       Description)
2                values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,       Description)
2                values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
2                values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York', 'Tester')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
2                values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York', 'Manager')
3 /

1 row created.

SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
2                values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
3 /

1 row created.

SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
2 /

ID   FIRST_NAME LAST_NAME START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01   Jason      Martin     25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison     Mathews    21-MAR-76 21-FEB-86    6661.78 Vancouver Tester
03   James      Smith      12-DEC-78 15-MAR-90    6544.78 Vancouver Tester
04   Celia      Rice       24-OCT-82 21-APR-99    2344.78 Vancouver Manager
05   Robert     Black      15-JAN-84 08-AUG-98    2334.78 Vancouver Tester
06   Linda      Green      30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David      Larry      31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James      Cat        17-SEP-96 15-APR-02    1232.78 Vancouver Tester

8 rows selected.

SQL>
SQL>
SQL> UPDATE employee
2 SET last_name = 'Orange'
3 WHERE id = 2;

1 row updated.

SQL>
SQL> Select * from employee;

ID   FIRST_NAME LAST_NAME START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01   Jason      Martin     25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison     Orange     21-MAR-76 21-FEB-86    6661.78 Vancouver Tester
03   James      Smith      12-DEC-78 15-MAR-90    6544.78 Vancouver Tester
04   Celia      Rice       24-OCT-82 21-APR-99    2344.78 Vancouver Manager
05   Robert     Black      15-JAN-84 08-AUG-98    2334.78 Vancouver Tester
06   Linda      Green      30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David      Larry      31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James      Cat        17-SEP-96 15-APR-02    1232.78 Vancouver Tester

8 rows selected.

同时更新多条记录

SQL> update employees
2 set    job    = 'SALESREP'
3 ,      msal   = msal - 500
4 ,      comm   = 0
5 ,      deptno = 30;

10 rows updated.

SQL>
SQL> select * from employees;

     EMPNO ENAME    INIT JOB             MGR BDATE           MSAL       COMM     DEPTNO
---------- -------- ----- -------- ---------- --------- ---------- ---------- ----------
         1 Jason    N     SALESREP          2 18-DEC-65        300          0         30
         2 Jerry    J     SALESREP          3 19-NOV-66       1100          0         30
         3 Jord     T     SALESREP          4 21-OCT-67       1200          0         30
         4 Mary     J     SALESREP          5 22-SEP-68       1300          0         30
         5 Joe      P     SALESREP          6 23-AUG-69       1400          0         30
         6 Black    R     SALESREP          7 24-JUL-70       1500          0         30
         7 Red      A     SALESREP          8 25-JUN-71       1600          0         30
         8 White    S     SALESREP          9 26-MAY-72       1700          0         30
         9 Yellow   C     SALESREP         10 27-APR-73       1800          0         30
        10 Pink     J     SALESREP            28-MAR-74       1900          0         30

　　

补充：数据库,Oracle教程