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# 一、统计
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## 1.1 数据量统计
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```sql
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exec sp_spaceused 表名;
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```
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## 1.2 批量统计
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本质是循环
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```sql
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exec sp_MSforeachtable "exec sp_spaceused '?'"
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```
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# 二、分页
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## 2.1 topN
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查看前5条
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```sql
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select TOP 5 *from T_ProductMain
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```
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## 2.2 分页查询
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要查询上述结果中第 7 条到第 9 条记录
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```sql
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select top 3 id from tablename
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where id not in (
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select top 6 id from tablename
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)
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```
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m-1=6，m=7
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```sql
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select top (n-m+1) id from tablename
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where id not in (
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select top m-1 id from tablename
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)
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```
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通过行号分页
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```sql
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SELECT * FROM
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(
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SELECT ROW_NUMBER()over(order by getdate()) AS rownumber,* from T_ProductMain
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) AS #a
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WHERE #a.rownumber>=1 AND #a.rownumber<=5
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```
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sqlserver 2012及以上版本支持
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```sql
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SELECT * FROM T_AttrPart
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ORDER BY PartNo offset 0 ROWS FETCH NEXT 10 ROWS ONLY
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```
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# 三、元数据
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## 3.1 查看所有表名
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```sql
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select top 10000
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ROW_NUMBER() OVER (ORDER BY a.name) AS No,
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a.name AS 表名,
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CONVERT(NVARCHAR(100),isnull(g.[value],'-')) AS 说明
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from
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sys.tables a left join sys.extended_properties g
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on (a.object_id = g.major_id AND g.minor_id = 0);
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```
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## 3.2 查看字段及类型
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```sql
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select column_name name,data_type type
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from information_schema.columns
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where table_name = 'T_AltAffix'
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```
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## 3.3 查看数据库版本
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```sql
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SELECT SERVERPROPERTY('productversion') as version_code, SERVERPROPERTY ('productlevel') as version_level, SERVERPROPERTY ('edition') as version_type
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```
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## 3.4 系统自带
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+ 存储过程
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```sql
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dt_addtosourcecontrol
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dt_addtosourcecontrol_u
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dt_adduserobject
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dt_adduserobject_vcs
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dt_checkinobject
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dt_checkinobject_u
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dt_checkoutobject
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dt_checkoutobject_u
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dt_droppropertiesbyid
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dt_dropuserobjectbyid
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dt_generateansiname
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dt_getobjwithprop
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dt_getobjwithprop_u
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dt_getpropertiesbyid
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dt_getpropertiesbyid_u
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dt_getpropertiesbyid_vcs
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dt_getpropertiesbyid_vcs_u
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dt_isundersourcecontrol
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dt_isundersourcecontrol_u
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dt_removefromsourcecontrol
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dt_setpropertybyid
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dt_setpropertybyid_u
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dt_validateloginparams
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dt_validateloginparams_u
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dt_vcsenabled
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dt_verstamp006
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dt_verstamp007
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dt_whocheckedout
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dt_whocheckedout_u
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```
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## 3.5 查看字符集
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```sql
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SELECT COLLATIONPROPERTY('Chinese_PRC_Stroke_CI_AI_KS_WS', 'CodePage');
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```
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| 字符集编码 | 类型 |
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| ---------- | --------------- |
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| 936 | 简体中文GBK |
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| 950 | 繁体中文BIG5 |
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| 437 | 美国/加拿大英语 |
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| 932 | 日文 |
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| 949 | 韩文 |
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| 866 | 俄文 |
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| 65001 | unicode UFT-8 |
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## 3.6 查看数据占用大小
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```sql
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SELECT a.name [文件名称] ,cast(a.[size]*1.0/128 as decimal(12,1)) AS [文件设置大小(MB)] ,
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CAST( fileproperty(s.name,'SpaceUsed')/(8*16.0) AS DECIMAL(12,1)) AS [文件所占空间(MB)] ,
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CAST( (fileproperty(s.name,'SpaceUsed')/(8*16.0))/(s.size/(8*16.0))*100.0 AS DECIMAL(12,1)) AS [所占空间率%] ,
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CASE WHEN A.growth =0 THEN '文件大小固定，不会增长' ELSE '文件将自动增长' end [增长模式] ,CASE WHEN A.growth > 0 AND is_percent_growth = 0
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THEN '增量为固定大小' WHEN A.growth > 0 AND is_percent_growth = 1 THEN '增量将用整数百分比表示' ELSE '文件大小固定，不会增长' END AS [增量模式] ,
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CASE WHEN A.growth > 0 AND is_percent_growth = 0 THEN cast(cast(a.growth*1.0/128as decimal(12,0)) AS VARCHAR)+'MB'
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WHEN A.growth > 0 AND is_percent_growth = 1 THEN cast(cast(a.growth AS decimal(12,0)) AS VARCHAR)+'%' ELSE '文件大小固定，不会增长' end AS [增长值(%或MB)] ,
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a.physical_name AS [文件所在目录] ,a.type_desc AS [文件类型]
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FROM sys.database_files a
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INNER JOIN sys.sysfiles AS s ON a.[file_id]=s.fileid
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LEFT JOIN sys.dm_db_file_space_usage b ON a.[file_id]=b.[file_id] ORDER BY a.[type]
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```
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# 四、视图
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+ 索引视图
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```sql
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# 创建索引视图，必须指定列名
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create view vwi_T_AttrPart WITH SCHEMABINDING as
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SELECT ROW_NUMBER()over(order by getdate()) AS rownumber,PartNo ,ParentNO ,PartName ,SectNo ,OrderNo ,SessionCode ,IsNew ,AltMainNo ,PayPartID ,EngineerTypeID1 ,EngineerTypeID2 ,EngineerTypeID3 ,EngineerID ,SectDetailID ,StartPile ,EndPile ,CenterPile ,Mileage ,PartTypeID ,PartRemarks from dbo.T_AttrPart
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# 添加索引列（报错:不能在索引或统计信息中使用 视图'dbo.vwi_T_AttrPart' 的列 'rownumber'，也不能将该列用作分区键，因为它不具有确定性）
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CREATE UNIQUE CLUSTERED INDEX
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ucidx_rownumber
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ON dbo.vwi_T_AttrPart(rownumber);
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``` |
