使用带有Where子句的更新SQL语句 (Using an update SQL statement with a Where clause)

In the following example, we only want to update one row of the Sales.SalesPerson table.In order to do that, we’ll need to use the WHERE clause.The where clause works exactlythe same as they did with the SELECT statements. So, let’s add the keyword WHERE,and set a filterthat specifies which record to modify.In this case, its BusinessEntityID is equal to 280.Now, we have an update SQL statement with SET, FROM and Where clause keywords.

在下面的示例中，我们只想更新Sales.SalesPerson表的一行。 为此，我们需要使用WHERE子句。 where子句的工作原理与使用SELECT语句的工作原理完全相同。 因此，让我们添加关键字WHERE，并设置一个过滤器，该过滤器指定要修改的记录。 在这种情况下，其BusinessEntityID等于280。现在，我们有了带有SET，FROM和Where子句关键字的更新SQL语句。

SELECT *
FROM Sales.SalesPerson S
WHERE BusinessEntityID = 280;
 
USE AdventureWorks2014;  
GO  
UPDATE S
  SET 
      Bonus = 8000, 
      CommissionPct = .30, 
      SalesQuota = NULL
FROM Sales.SalesPerson S
WHERE BusinessEntityID = 280;

And now, we see that the columns Bonus, ComissionPct, and SalesQuota have been changedwith new values.

现在，我们看到Bonus，ComissionPct和SalesQuota列已更改为新值。

SELECT *
FROM Sales.SalesPerson S
WHERE BusinessEntityID = 280;

将SQL Update语句与顶层子句一起使用 (Using an SQL Update statement with a Top Clause)

In the following examples, we can see that the use the TOP clause to limit the number of rows that are modified in the SQL UPDATE statement.

在以下示例中，我们可以看到使用TOP子句来限制在SQL UPDATE语句中修改的行数。

The following example updates the multiple columns of the matching rows in the Sales.SalesPerson table

下面的示例更新Sales.SalesPerson表中匹配行的多个列

USE AdventureWorks2014;  
GO  
UPDATE TOP (5) S
  SET 
      Bonus = 90000, 
      CommissionPct = .06, 
      SalesQuota = NULL
FROM Sales.SalesPerson S

We can see that the SQL update ran over a random selection of rows.

我们可以看到SQL更新遍历了随机选择的行。

 
SELECT *
FROM Sales.SalesPerson S where  CommissionPct = .06

注意： 使用CTE将更新SQL语句与最高条款一起使用 (Using an update SQL statement with a Top Clause using a CTE)

As we all know that the SQL UPDATE statement with a TOP clause doesn’t support an ORDER BY clause but it is possible to get the sorted order of the columns using a CTE (Common Table Expression).

众所周知，带有TOP子句SQL UPDATE语句不支持ORDER BY子句，但是可以使用CTE （公用表表达式）获取列的排序顺序。

Let us run the same SQL update statement using a CTE

让我们使用CTE运行相同SQL更新语句

 
WITH CTE
     AS (SELECT TOP 5 *
         FROM Sales.SalesPerson
         ORDER BY BusinessEntityID)
     UPDATE CTE
       SET 
           Bonus = 190000, 
           CommissionPct = .07, 
           SalesQuota = NULL;

The output signifies the update ran over a order collection of BusinessEntityID.

输出表示更新已遍历BusinessEntityID的订单集合。

SELECT *
FROM Sales.SalesPerson where  CommissionPct = .07

将SQL Update语句与计算值一起使用 (Using an SQL Update statement with Computed values)

The following example uses computed value in SQL Update statement. The example increases the value of the Bonus column by 100 and ComissionPct column by 0.005 values for all rows of the BusinessEntityID equal to 288.

下面的示例在SQL Update语句中使用计算值。 对于所有等于288的BusinessEntityIDupdate语句，该示例将Bonus列的值增加100，并将ComissionPct列的值增加0.005。

USE AdventureWorks2014;  
GO  
UPDATE Sales.SalesPerson
  SET 
      Bonus = Bonus+100, 
      CommissionPct = CommissionPct+0.005 
WHERE BusinessEntityID = 288;

将SQL Update语句与Compound运算符一起使用 (Using an SQL Update statement with Compound operators)

The following example uses the compound operator ‘+=’ and ‘*=’ to add 100 to the Bonus column and multiply 0.002 to CommissionPct column

下面的示例使用复合运算符'+ ='和'* ='将100加到Bonus列中，并将0.002乘以CommissionPct列

USE AdventureWorks2014;  
GO  
SELECT * FROM Sales.SalesPerson WHERE BusinessEntityID = 289;
GO
UPDATE Sales.SalesPerson
  SET 
      Bonus += 100, 
      CommissionPct *= 0.005 
WHERE BusinessEntityID = 289;
GO
SELECT * FROM Sales.SalesPerson WHERE BusinessEntityID = 289;

使用带有默认值SQL Update语句 (Using an SQL Update statement with a default values)

The following example sets the Primary column to its default value ((0)) for all rows that have a value equal to 1

下面的示例将值等于1的所有行的Primary列设置为其默认值（（0））

USE AdventureWorks2014;  
GO  
UPDATE Production.ProductProductPhoto  
SET [Primary] = DEFAULT  
WHERE [Primary]=1

SELECT name,object_name(object_id),object_definition(default_object_id) Default_Definition
FROM   sys.columns
WHERE  name      ='Primary'
AND    object_id = object_id('Production.ProductProductPhoto')

将SQL Update语句与SQL连接一起使用 (Using an SQL Update statement with a SQL Joins)

This example modifies the Rate column of the entire rows employee where they belong to the ‘Research and Development’ group.

本示例修改了属于“研究与开发”组的整个行员工的“费率”列。

UPDATE EPH
  SET 
      EPH.Rate*=2
FROM HumanResources.EmployeePayHistory EPH
     INNER JOIN HumanResources.Employee EMP ON EMP.BusinessEntityID = EPH.BusinessEntityID
     INNER JOIN HumanResources.EmployeeDepartmentHistory H ON EMP.BusinessEntityID = H.BusinessEntityID
     INNER JOIN HumanResources.Department Dept ON H.DepartmentID = Dept.DepartmentID
WHERE Dept.GroupName = 'Research and Development';

SELECT EMP.JobTitle, 
       EPH.Rate * 2
FROM HumanResources.EmployeePayHistory EPH
     INNER JOIN HumanResources.Employee EMP ON EMP.BusinessEntityID = EPH.BusinessEntityID
     INNER JOIN HumanResources.EmployeeDepartmentHistory H ON EMP.BusinessEntityID = H.BusinessEntityID
     INNER JOIN HumanResources.Department Dept ON H.DepartmentID = Dept.DepartmentID
WHERE Dept.GroupName = 'Research and Development';

使用链接服务器和OPENQUERY的远程表 (Remote tables using a linked server and OPENQUERY)

The following example uses the linked server to update a data on a remote server.

以下示例使用链接的服务器更新远程服务器上的数据。

UPDATE HQDBT01.AdventureWorks2014.HumanResources.Department  
SET GroupName = N'CIS Relations'  
WHERE DepartmentID = 4;
 
 
SELECT GroupName FROM HQDBT01.AdventureWorks2014.HumanResources.Department WHERE DepartmentID = 4

In the following example, rows on the remote table is updated using the OPENQUERYrowset function

在以下示例中，使用OPENQUERY行集功能更新远程表上的行

UPDATE OPENQUERY(HQDBT01, 'SELECT GroupName FROM AdventureWorks2014.HumanResources.Department WHERE DepartmentID = 4')
  SET 
      GroupName = 'Sales and Marketing';

摘要 (Summary)

Thus far, we’ve discussed some of simple methods of updating rows using a SQL Update statement in SQL Server and various permutations using conditions, clauses and in other contexts. I hope you enjoyed reading this article and for any questions, please feel to comment below…

到目前为止，我们已经讨论了在SQL Server中使用SQL Update语句更新行的一些简单方法，以及在使用条件update语句，子句和其他上下文的情况下进行的各种排列。 希望您喜欢阅读本文，如有任何疑问，请在下面发表评论……

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sql update 语句