sql中的分段列表
表：用户号码，登录时间
显示 ：每日登录各时间段的登录人数，和每天登录人数
if isnull(object_id('#tb'),'')=''
drop table #tb
CREATE TABLE #tb(列名1 varchar(12),时间 datetime)
INSERT INTO #tb
SELECT '03174190188','2009-11-01 07:17:39.217' UNION ALL
SELECT '015224486575','2009-11-01 08:01:17.153' UNION ALL
SELECT '013593006926','2009-11-12 08:04:46.560' UNION ALL
SELECT '013593006926','2009-11-12 07:05:46.560' UNION ALL
SELECT '013599584239','2009-11-22 08:53:27.763' UNION ALL
SELECT '013911693526','2009-11-23 08:53:51.683' UNION ALL
SELECT '013846472440','2009-11-23 08:54:57.233' UNION ALL
SELECT '013990353697','2009-11-24 08:55:25.077' UNION ALL
SELECT '013990353697','2009-11-25 08:56:01.327' UNION ALL
SELECT '013945594843','2009-11-26 08:57:02.233' UNION ALL
SELECT '013990353697','2009-11-27 08:57:29.700' UNION ALL
SELECT '013916597421','2009-11-28 08:59:49.390' UNION ALL
SELECT '03916995857','2009-11-29 09:11:05.607' UNION ALL
SELECT '015097712001','2009-11-30 09:13:50.293'
--SQL查询如下:
DECLARE @minDate datetime,@maxDate datetime;
SELECT @minDate = '2009-11-1',@maxDate = '2009-12-01';
select convert(char(10),dateadd(d,number,@minDate),120),
sum(case when convert(char(8),时间,108) between '00:00' and '01:00' then 1 else 0 end) as '00:00~01:00',
sum(case when convert(char(8),时间,108) between '01:00' and '02:00' then 1 else 0 end) as '01:00~02:00',
sum(case when convert(char(8),时间,108) between '02:00' and '03:00' then 1 else 0 end) as '02:00~03:00',
sum(case when convert(char(8),时间,108) between '03:00' and '04:00' then 1 else 0 end) as '03:00~04:00',
sum(case when convert(char(8),时间,108) between '04:00' and '05:00' then 1 else 0 end) as '04:00~05:00',
sum(case when convert(char(8),时间,108) between '05:00' and '06:00' then 1 else 0 end) as '05:00~06:00',
sum(case when convert(char(8),时间,108) between '06:00' and '07:00' then 1 else 0 end) as '06:00~07:00',
sum(case when convert(char(8),时间,108) between '07:00' and '08:00' then 1
相关文档：
create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',
@pagesize int output,--每页显示记录条数
@currentpage int output,--第几页
@orderid nvarchar(50),--主键排序
@sort int,--排序方式，1表示升序，0表示降序排列
......
常用SQL查询：
1、查看表空间的名称及大小
select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
2、查看表空间物理文件的名称及大小
select tablespace_name, file_id, ......
Sql Server中的日期与时间函数
1. 当前系统日期、时间
select getdate()
2. dateadd 在向指定日期加上一段时间的基础上，返回新的 datetime 值
例如：向日期加上2天
select dateadd(day,2,'2004-10-15') --返回：2004-10-17 00:00:00.000
3. datediff 返回跨两个� ......
use Tempdb
go
if object_ID ( 'fn_ACITEncryption' ) is not null
drop function fn_ACITEncryption
go
create function fn_ACITEncryption
(
@Str nvarchar ( 4000), -- 加密的字符串
@Flag bit = 1, --1 、加密 0 、解密
@Key nvarchar ( 50) -- 密文
)
returns nvarchar ( 4000) ......
