The UPDATE Statement is used to modify the existing rows in a table.The Syntax for SQL UPDATE Command is: UPDATE table_name SET column_name1 = value1, column_name2 = value2, ... [WHERE condition] table_name - the table name which has to be updated. column_name1, column_name2...
(转)SQL: UPDATE Statement The UPDATE statement allows you to update a single record or multiple records in a table. The syntax the UPDATE statement is: UPDATE table SET column = expression WHERE predicates; Example #1 - Simple example Let's take a look at a very simple example. UPDATE sup...
UPDATE Table The following SQL statement updates the first customer (CustomerID = 1) with a new contact personanda new city. ExampleGet your own SQL Server UPDATECustomers SETContactName ='Alfred Schmidt', City='Frankfurt' WHERECustomerID =1; ...
第八十二章 SQL命令 UPDATE(一) 为指定表中的指定列设置新值。 大纲 UPDATE [%keyword] table-ref [[AS] t-alias] value-assignment-statement [FROM [optimize-option] select-table [[AS] t-alias] {, select-table2 [[AS] t-alias]} ] [WHERE condition-expression] UPDATE [%keyword] table-ref ...
SQL命令 UPDATE(四) 示例 本节中的示例更新SQLUser.MyStudents表。 下面的示例创建SQLUser.MyStudents表,并用数据填充它。 因为这个示例的重复执行会积累具有重复数据的记录,所以它使用TRUNCATE TABLE在调用INSERT之前删除旧数据。 在调用UPDATE示例之前执行这个示例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释...
SQL语法基础之UPDATE语句 作者:尹正杰 版权声明:原创作品,谢绝转载!否则将追究法律责任。 一.查看UPDATE语句的帮助信息 1>.查看UPDATE的帮助信息 mysql>?UPDATEName:'UPDATE'Description: Syntax:UPDATEisa DML statement that modifies rowsinatable. AnUPDATEstatement can startwithaWITHclausetodefine commontableexpressi...
可以一次更新兩個資料表, 您可以將updateCommand在兩段SQL statement中間以";"區隔, ex: <asp : SqlDataSource ID = "SqlDataSource1" runat = "server" ConnectionString = " <% $ ConnectionStrings:NorthwindConnectionString %> " DeleteCommand = "DELETE FROM [Employees] WHERE [Employee...
UPDATEtable_nameSETcolumn1=value1,column2=value2,...WHEREcondition; 1. 2. 3. 其中,table_name表示要更新的表名,column1 = value1, column2 = value2, ...表示要更新的列及其对应的值,condition表示更新的条件。在UPDATE语句中,我们可以使用列的当前值进行计算,从而实现列的相加更新。
A searched update statement depends on the table being updated, all of its conglomerates (units of storage such as heaps or indexes), all of its constraints, and any other table named in the WHERE clause or SET expressions. A CREATE or DROP INDEX statement or an ALTER TABLE statement for ...
then use this value in your update statement. update Table2 set Field1 =@defvalue Saturday, May 17, 2008 11:19 AM ramireddyindia - Thanks for your response. Unfortunetly, either the code does not work, or I'm doing something wrong. Are you sure this will work with SQL2005?