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   SQLite的UPDATE查詢用於修改表中已有的記錄。可以使用帶有WHERE子句的UPDATE查詢更新選定行,否則所有的行都會被更新。

語法

    帶有WHERE子句的UPDATE查詢的基本語法如下:

UPDATE table_name
SET column1 = value1, column2 = value2...., columnN = valueN
WHERE [condition];

例項

   假設COMPANY表有以下記錄:

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0

    下面是一個例項,它會更新ID為6的客戶地址:

sqlite> UPDATE COMPANY SET ADDRESS = 'Texas' WHERE ID = 6;

   現在,COMPANY表有以下記錄:

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          Texas       45000.0
7           James       24          Houston     10000.0

  如果你想修改COMPANY表中ADDRESS和SALARY列的所有值,則不需要使用WHERE子句,UPDATE查詢如下:

sqlite> UPDATE COMPANY SET ADDRESS = 'Texas', SALARY = 20000.00;

   現在,COMPANY表有以下記錄:

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          Texas       20000.0
2           Allen       25          Texas       20000.0
3           Teddy       23          Texas       20000.0
4           Mark        25          Texas       20000.0
5           David       27          Texas       20000.0
6           Kim         22          Texas       20000.0
7           James       24          Texas       20000.0