sqlserver中查询,sqlserver中查询成绩高于课程平均分的学生姓名

sql server 怎么查询

一般情况下:

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1、人们不会直接操作SQL Server进行数据的管理和查询,只有管理、设计人员或是学习编程的朋友才会在SQL Server自带的管理器里进行数据的管理和查询工作。

2、设计好了的带SQL Server查询的应用(或叫程序)会有相对简单的界面,你填好需要查询的条件,进行简单的操作就能查到你能查到的,想查到的数据。具体的如何查,取决于软件设计者的设计。

二、直接操作SQL Server进行查询:

各版本的SQL Sserver的具体做法不相同,但基本思路是一样的,登录SQL Server的管理器,然后使用管理器的基本功能及标准的SQL语句进行查询。

三、如果上面说的你一点儿也不明白,那说明你可能没有这方面的知识,建议你搜索“Microsoft SQL Server 2008 R2基础教程”,然后耐心地翻看一下。

SQL Server中如何搜索datetime数据类型数据.

1.这是查询与当前时间在同一周内的数据,sql语句是:

2.select

*

from

where

datediff(week,时间字段,getdate())=0

3.也可以稍作修改用来查询与指定日期在同一周内的数据:

4.select

*

from

where

datediff(week,时间字段,'2002-01-01')=0

5.select

*

from

where

startdate

between

指定日期

and

指定日期

6.select

*

from

where

leavedate

between

指定日期

and

指定日期

7.查询一段时间(

不需要固定时间的,只需要前后间隔时间的)

8.select

*

from

where

datediff(day,startdate,leavedate)7

and

startdate

=

指定日期9.select

*

from

where

datediff(day,startdate,leavedate)7

and

leavedate

=

指定日期

这是查询此日期开始时间到离开时间在七天之间的所有数据,

怎么在sql server中写查询语句

打开SQL Server Management Studio 界面。法1:单击工具栏的“新建查询”;方法2:或右击数据库名称-》“新建查询”;方法3:选中数据表-》编写表脚本为-》SELECT到-》新查询编辑器窗口。在数据库对象下拉框中选择“BooksDB”,在查询编辑器输入区中输入Transact-SQL语句,然后点击工具栏或“查询”菜单中的“!执行”,执行输入区的Transact-SQL语句

sql语句server中怎么查询用户的角色和权限?

SQL Server中查询用户的对象权限和角色的方法 \x0d\x0a\x0d\x0a-- 查询用户的object权限\x0d\x0aexec sp_helprotect NULL, 'UserName'\x0d\x0a-- 查询用户拥有的role\x0d\x0aexec sp_helpuser 'UserName'\x0d\x0a-- 查询哪些用户拥有指定的系统role\x0d\x0aexec sp_helpsrvrolemember 'sysadmin'\x0d\x0a-- 可查询嵌套role\x0d\x0aWITH tree_roles as\x0d\x0a(\x0d\x0aSELECT role_principal_id, member_principal_id\x0d\x0aFROM sys.database_role_members\x0d\x0aWHERE member_principal_id = USER_ID('UserName')\x0d\x0aUNION ALL\x0d\x0aSELECT c.role_principal_id,c.member_principal_id\x0d\x0aFROM sys.database_role_members as c\x0d\x0ainner join tree_roles\x0d\x0aon tree_roles.member_principal_id = c.role_principal_id\x0d\x0a)\x0d\x0aSELECT distinct USER_NAME(role_principal_id) RoleName\x0d\x0aFROM tree_roles\x0d\x0a\x0d\x0a-- 其他权限相关基本表\x0d\x0aselect * from sysusers\x0d\x0aselect * from syspermissions\x0d\x0a\x0d\x0a-- Who has access to my SQL Server instance?\x0d\x0aSELECT\x0d\x0aname as UserName, type_desc as UserType, is_disabled as IsDisabled\x0d\x0aFROM sys.server_principals\x0d\x0awhere type_desc in('WINDOWS_LOGIN', 'SQL_LOGIN')\x0d\x0aorder by UserType, name, IsDisabled\x0d\x0a\x0d\x0a-- Who has access to my Databases?\x0d\x0aSELECT\x0d\x0adp.name as UserName, dp.type_desc as UserType, sp.name as LoginName, sp.type_desc as LoginType\x0d\x0aFROM sys.database_principals dp\x0d\x0aJOIN sys.server_principals sp ON dp.principal_id = sp.principal_id\x0d\x0aorder by UserType\x0d\x0a\x0d\x0aselect * from sys.database_principals\x0d\x0a\x0d\x0a-- Server Roles\x0d\x0aselect\x0d\x0ap.name as UserName, p.type_desc as UserType, pp.name as ServerRoleName, pp.type_desc as ServerRoleType\x0d\x0afrom sys.server_role_members roles\x0d\x0ajoin sys.server_principals p on roles.member_principal_id = p.principal_id\x0d\x0ajoin sys.server_principals pp on roles.role_principal_id = pp.principal_id\x0d\x0awhere pp.name in('sysadmin')\x0d\x0aorder by ServerRoleName, UserName\x0d\x0a\x0d\x0a-- Database Roles\x0d\x0aSELECT\x0d\x0ap.name as UserName, p.type_desc as UserType, pp.name as DBRoleName, pp.type_desc as DBRoleType, pp.is_fixed_role as IfFixedRole\x0d\x0aFROM sys.database_role_members roles\x0d\x0aJOIN sys.database_principals p ON roles.member_principal_id = p.principal_id\x0d\x0aJOIN sys.database_principals pp ON roles.role_principal_id = pp.principal_id\x0d\x0awhere pp.name in('db_owner', 'db_datawriter')\x0d\x0a\x0d\x0a-- What can these users do?\x0d\x0aSELECT\x0d\x0agrantor.name as GrantorName, dp.state_desc as StateDesc, dp.class_desc as ClassDesc, dp.permission_name as PermissionName ,\x0d\x0aOBJECT_NAME(major_id) as ObjectName, GranteeName = grantee.name\x0d\x0aFROM sys.database_permissions dp\x0d\x0aJOIN sys.database_principals grantee on dp.grantee_principal_id = grantee.principal_id\x0d\x0aJOIN sys.database_principals grantor on dp.grantor_principal_id = grantor.principal_id\x0d\x0awhere permission_name like '%UPDATE%'


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