T-SQL中聚合函数对空值(NULL)的处理
聚合函数对一组值执行计算,并返回单个值。除了 COUNT 以外,聚合函数都会忽略空值。聚合函数经常与 SELECT 语句的 GROUP BY 子句一起使用。 所有聚合函数均为...
T-SQL 如何获取一个表的列名
方法1: exec sp_columns [{table_name}],[{schema_name}] 方法2: SELECT *FROM syscolumnsWHERE id=OBJECT_ID(‘{schema_name}.{table_name}]') 方法3: SEL...
SQL Server 2005 T-SQL问题:您能信任查询优化器吗?我知道我不能!
This question is linked to my previous one ( posted as an anonymous user - now I have an account ) and, before I begin, I would like to give the credi...
T-SQL/PL-SQL/MySQL/Sql Server/Linq笔记
记一些T-SQL/PL-SQL和Sql Server/MySql以及Linq相关的笔记,备查 Q:获取指定数据库的所有表信息: MySql: SELECT * FROM information_schema.TABLES WHERE table_schema = 'qi...
T-SQL利用Case When Then多条件判断
CASE WHEN 条件1 THEN 结果1 WHEN 条件2 THEN 结果2 WHEN 条件3 THEN 结果3 WHEN 条件4 THEN 结果4......... WHEN 条件N THEN 结果N ELSE 结果XENDCase具有两种格式。简单Case...
无法启动T-SQL调试,未能连接到计算机,工作站服务没有启动
SQL2012无法启动T-SQL调试,未能连接到计算机,工作站服务没有启动 解决方案: 工作站服务没有启动 运行 services.msc 找到最后面的一个服务就是worlstation 将其设置为自动,然后点启动 注意其依存服务必须也启动,否则他也无法启动 ...
无法启动T-SQL调试,未能连接到计算机‘’.‘,请求的名称有效,但是找不到请求的类型看数据,该怎么办呢
无法启动T-SQL调试,未能连接到计算机‘’.‘,请求的名称有效,但是找不到请求的类型看数据,该怎么办呢 哪位大神 帮帮我?6 个解决方案 #1 你的sql ser...
T-SQL :SQL Server系统数据库(二)
master:master数据库储存实例范围的元数据信息,服务器配置,实例中的所有数据库信息和初始化信息。Resource:Resource数据库是一个隐藏,只读数据库,存储所有系统对象的定义。当查询数据库中的系统对象时,位于当前数据库的sys架构中,但实际定义在Resource数据库中。model...
在T-SQL中将负小数转换为二进制
I have tried to find information and how. But it did not contain any information that would help. 我试着去找一些信息和方法。但它没有包含任何有用的信息。 With T-SQL, I want to co...
如何进行复杂的T-SQL更新查询?
I have a database table: 我有一个数据库表: Col1 | Col2 | Col3------------------ 1 | 2 | - 2 | 3 | - 3 | 4 | - 4 | 5 | - Columns 1 and ...
在T-SQL中,多个INNER JOIN的最佳设计是什么?
I have looked for a similar issue to no avail. If I have missed the solution, my apologies and please point me in the right direction. 我找了一个类似的问题无济于事。...
从CASE语句分配给T-SQL变量
I'd like to assign some variables inside a query that uses CASE statements for it's columns. Not quite sure how to do this, having trouble finding the...
如何将T-SQL查询转换为存储过程?
I am running SQL Server 2012 and I need to convert a T-SQL query into a Stored Procedure. My aim is to run a SQL job that will execute this Stored Pro...
如何在T-SQL中使用存储过程创建文件
i am trying to create a file with a stored procedure in T-SQL. I need this to trigger an event in another program. Could anybody help me with that? I ...
T-Sql中有三元运算符吗?
What are alternatives to implement the following query: 有什么替代方法可以实现以下查询: select * from table where isExternal = @type = 2 ? 1 : 02 个解决方案 ...
如何对丢弃表的T-SQL存储过程进行参数化?
I'm after a simple stored procedure to drop tables. Here's my first attempt: 我正在使用一个简单的存储过程来删除表。这是我的第一次尝试: CREATE PROC bsp_susf_DeleteTable (@TableNam...
T-SQL 将存储过程结果插入到表中
解决方案1:CREATE TABLE #tmpBus( COL1 INT, COL2 INT) INSERT INTO #tmpBusExec SpGetRecords 'Params'解决方案2:SELECT * INTO #MyTempTable FROM OPENROWSET('SQL...
在脚本中使用T-SQL“两位数年截止日期”
I'm writing a script to cleanup some data, converting dates stored in an varchar field from dd/mm/yy to dd/mm/yyyy format. (yes, I know, but not my de...
连接到只有“最新”记录的t-sql。
I've got two tables. Table "B" has a one to many relationship with Table "A", which means that there will be many records in table "B" for one record ...
按日和小时分组的t-SQL
I need to determine the number of sales for the week and weekend but the weekend is to be counted as between 6pm Friday and 9am Monday. 我需要确定一周和周末的销售数...