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select <table fields list> from <table names list> where <row constraints specification> group by <grouping specification> having <grouping selection specification> order by <order rules specification>查看全部
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结构化查询语言（Structured Query Language）查看全部
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最基本的SQL语句查看全部
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ER图查看全部
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元组 属性列查看全部
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最基本的SQL语句查看全部
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RDBMS 关系型数据库管理系统查看全部
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分离--附加查看全部
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附加数据库：.mdf;还原数据库：.bak查看全部
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--count：统计结果数 select count(SalesPersonID) from Sales.SalesOrderHeader where SalesPersonID is not null --distinct：独一无二的 select distinct(SalesPersonID) from Sales.SalesOrderHeader where SalesPersonID is not null查看全部
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--查询null值 select * from Production.Product where size isnull --查询非null select * from Production.Product where size is not null查看全部
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在什么之间：between ... and ... 例： select SalesOrderID,OrderDate,SalesPersonID,TotalDue as TotalSales from Sales.SalesOrderHeader where Orderdate between '2005-08-01' and '1/1/2006' --通配符%，模糊搜索 select * from Production.Product where name like '%Mountain%' --通配符_，单个字符 select * from Production.Product where name like '_ountain%' --in：匹配多个字段，即集合 select * from Production.Product where color in ('red','white','black') --not in : 不等于某个字段 select * from Production.Product where class not in ('H','L')查看全部
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--算术计算，round(rate*40*52,1)，1代表小数点后保留一位小数，0则不保留 select BusinessEntityID, rate*40*52 as AnnualSalary, round(rate*40*52,1) as AnnualSalary round(rate*40*52,0) as AnnualSalary from HumanResources.EmployeePayHistory查看全部
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use AdventureWorks--选择数据库 select Top 10 * from Production.Product--输出前10个数据 --根据listprice和Name进行降序排序 select ProductID, Name, ProductNumber, Color, Size, ListPrice from Production.Product order by listprice desc,Name desc --根据输出的第二个列进行排序，即Name select ProductID, Name, ProductNumber, Color, Size, ListPrice from Production.Product order by 2 --isnull：输出时代替null值，例： select ProductID, Name, ProductNumber, isnull(Color,''), isnull(Size,''), ListPrice from Production.Product --as：别名，例： select ProductID, Name, ProductNumber, isnull(Color,'') as Color, isnull(Size,'') as Size123, --using an alias ListPrice from Production.Product --使用”+“连接字符 select ProductID, Name as ProductName, 'The list price for '+ProductNumber+'is $ '+convert(varchar,ListPrice)+'.' as Description from Production.Product查看全部
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SQL查询语句查看全部
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