UPDATE命令在MySQL中用于更新記錄。通過它，SET命令可用于設(shè)置新值。讓我們首先創(chuàng)建一個(gè)表-mysql>?create?table?DemoTable

(

EmployeeId?int?NOT?NULL?AUTO_INCREMENT?PRIMARY?KEY,

EmployeeName?varchar(50),

EmployeeSalary?int

);

使用插入命令在表中插入一些記錄-mysql>?insert?into?DemoTable(EmployeeName,EmployeeSalary)?values('Chris',56780);

mysql>?insert?into?DemoTable(EmployeeName,EmployeeSalary)?values('Robert',45670);

mysql>?insert?into?DemoTable(EmployeeName,EmployeeSalary)?values('Mike',87654);

mysql>?insert?into?DemoTable(EmployeeName,EmployeeSalary)?values('David',34569);

使用select語句顯示表中的所有記錄-mysql>?select?*from?DemoTable;

這將產(chǎn)生以下輸出-+------------+--------------+----------------+

|?EmployeeId?|?EmployeeName?|?EmployeeSalary?|

+------------+--------------+----------------+

|??????????1?|?Chris????????|??????????56780?|

|??????????2?|?Robert???????|??????????45670?|

|??????????3?|?Mike?????????|??????????87654?|

|??????????4?|?David????????|??????????34569?|

+------------+--------------+----------------+

4?rows?in?set?(0.00?sec)

以下是更新記錄和設(shè)置新值的查詢-mysql>?update?DemoTable

set?EmployeeSalary=EmployeeSalary+12346;

Rows?matched:?4?Changed:?4?Warnings:?0

讓我們檢查表記錄-mysql>?select?*from?DemoTable;

這將產(chǎn)生以下輸出-+------------+--------------+----------------+

|?EmployeeId?|?EmployeeName?|?EmployeeSalary?|

+------------+--------------+----------------+

|??????????1?|?Chris????????|?69126??????????|

|??????????2?|?Robert???????|?58016??????????|

|??????????3?|?Mike?????????|?100000?????????|

|??????????4?|?David????????|?46915??????????|

+------------+--------------+----------------+

4?rows?in?set?(0.00?sec)

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