1/内部连接的早期语法结构 INNER JOIN SELECT * FROM Person.Person JOIN HumanResources.Employee ON Person.Person.ID = HumanResources.Employee.ID 等价于早期的也就是老版本的 SELECT * FROM Person.Person,HumanResources.Employee WHERE Person.Person.ID = HumanResources.Employee.ID 2…

SELECT <SELECT LIST> FROM <the table you want to be the "LEFT" table> <LEFT|RIGHT> [OUTER] JOIN <table you want to be the "RIGHT" table> ON <join condition> 可以看做JOIN之前的表是左表,之后的表是右表. 外部连接本质上是包含的.明确包含的记录取决于使…

所有JOIN语句的共同点是:将一个记录与另外一个或多个记录匹配,从而生成一个新记录,这个记录是由两个记录的合并列所产生的一个超集. 内部连接: 内部连接语法结构:SELECT <select list> FROM <first table> <join_type> <second table> [ON <join_condition>] INNER JOIN(内部连接)类似与WHERE子句 内部连接是一个排他连接,排除表中没有匹配的所有记录. I…

测试数据脚本 CREATE TABLE Atable ( S# INT, Sname ), Sage INT, Sfrom ) ) insert into Atable ,N,N'A' union all ,N, N'A' union all ,N,N'A' union all ,N,N'A' CREATE TABLE Btable ( S# INT, Sname ), Sage INT, Sfrom ) ) insert into Btable ,N,N'B' union all ,N,N'B…

CREATE <object type> <object name> CREATE DATABASE <database name> 比较完整的语法列表: 日志文件和数据库文件不要放在一块磁盘上,争抢磁盘IO,还有危害安全性. CREATE DATABASE <database name>[ON [PRIMARY] ([NAME = <'logical file name'>,] FILENAME = <'file name'> [,…

[ServerName.[DataBaseName.[SchemeName.]]]ObjectName 服务器名,数据库名,模式名,对象名 其中模式是一个新出的坑爹的东西.…

INSERT [TOP (<expression>) [PERCENT] [INTO] <tabular object>[(column list)][OUTPUT <output clause>]{VALUES (<data values>) [,(<data values>)] [,...n]| <table source>| EXEC <procedure>| DEFAULT VALUES 这个结构看起来崩溃,更基本…

SELECT ManagerID AS Manager,COUNT(*) AS Reports FROM Human.Resources.Employee2 WHERE EmployeeID !=5 GROUP BY ManagerID HAVING COUNT(*)>3; having 是聚合以后算的,很棒.where 是聚合以前算的. 用FOR XML子句可以输出XML格式. ALL DISTINCT的用法.…

select Name,salesPersonID From Sales.store where name between 'g' and 'j' and salespersonID > 283 order by salespersonid,name desc/ASC 本语句的between的用法还是很有新意的,这个between是g开头和j开头之间的,不知道汉字会是什么情况? group by,经常配合min max sum avg,配合AS命名别名.group by配合聚合函数是常用的. c…

select [all|distinct] [top (<expression>) [Percent] [with ties]] <column list> [from <source table(s)/views>] [where <restrictive condition>] [group by <column name or expression using a column in the select list>] [having &l…