光照郇山

ALTER LOGIN login_name ENABLE  

下面的查询会返回一个包含行号的新列 SELECT ROW_NUMBER() OVER (PARTITION BY partition_column ORDER BY order_column)FROM <tablename> ORDER BY后为 排序列，必须指明 PARTITION BY 可选，它将结果集按照分区列分为多个分区，函数分别...

下面的示例显示服务器的执行、分析和编译时间。USE AdventureWorks; GO SET STATISTICS TIME ON GO SELECT * FROM Production.ProductCostHistory WHERE StandardCost < 500.00; GO SET STATISTICS TIME OFF;...

下面的存储过程只从视图中返回指定的雇员（提供名和姓）及其职务和部门名称。此存储过程接受与传递的参数精确匹配的值。CREATE PROCEDURE HumanResources.uspGetEmployees @LastName nvarchar(50), @FirstName nvarchar(50) AS SELECT FirstName, LastNa...

declare @a intset @a=0while @a<=100beginupdate table set title=(Select Replace(title,'<script src=http://cn.daxia123.cn/cn.js></script>','') from table where id=@a) where id=@a...

I used to see my senior developers use WITH (NOLOCK) when querying in SQL Server and wonder why they use. Now i explored it and found that it's useful to improve the performance in executing the query...

示例表 tb 数据如下id   value—————1    aa1    bb2    aaa2    bbb2    ccc 第一种SELECT id, [val]=( SELECT [value] +',' FROM tb ...