SQL高级应用
Garin Zhang
追加:row_number, rank, dese_rank, ntile
1. row_number: 为查询出来的每一行记录生成一个序号。
SELECT row_number() OVER(ORDER BY field) AS row_n
from tablename;
分页查询:
with t_towtable
as (select row_number over(order by field1) as row_number from tb)
select * from t_rowtable where row_number > 1 and row_number > 4 order by field1;
ROW_NUMBER() OVER([<partition_by_caluse>] <order_by_clause>);
2. rank: 返回结果集的分区内每行的排名:
RANK() OVER([<partition_by_caluse_按照某个字段分区>]<order_by_clause_排序>);
Examples:
WITH CustomerSum AS
(SELECT CustomerID, SUM(totalDue) AS total
from sales GROUP BY CustomerID)
SELECT * RANK() OVER (ORDER BY total DESC) AS RANK
from CustomerSum
3. dense_rank: 顺序排序(生成的序号是连续的)。
4. ntile:取前多少个名次的排名的行。
SELECT SalesID, NTILE(1000) OVER(ORDER BY CustomerID) AS NTile
from Sales
桶数的计算:
if(记录数%桶数 == 0)
每桶记录数都为记数总数/桶数
else
recordCount1 = total/tongNum + 1;
int n = 1;
m = recordCont1*n;
while((total - m) % (tongNum - n)) != 0)
{
n++;
m = recordCount1 * n;
}
recordCount2 = (total - m) / (tongNum - n);
将前n个桶记录设置为recordCount1
将n+1个到后面所有桶记为recordCount2
相关文档:
xtype 代表类型
C = CHECK 约束
D = 默认值或 DEFAULT 约束
F = FOREIGN KEY 约束
L = 日志
FN = 标量函数
IF = 内嵌表函数
P = 存储过程
PK = PRIMARY KEY 约束(类型是 K)
RF = 复制筛选存储过程
S = 系统表
TF = 表函数
TR = 触发器
U = 用户表
UQ = UNIQUE 约束(类型是 K)
V = 视图 ......
1. SQL Server的系统表
Microsoft的SQL Server是一个可伸缩的高性能数据库管理系统,专为分布式客户机/服
务器环境而设计,SQL Server几乎将所有的配置信息、安全性信息和对象信息都存储在了它自
身的系统表中,而系统表存在于每个独立的数据库中,存储一个特定数据库对象信息的系统表
通常称为数据库目录,M ......
sql 添加新分区
ALTER PARTITION SCHEME SCH_Source_ID_DT_ID
NEXT USED sn3
go
ALTER PARTITION FUNCTION [PF_Source_ID_DT_ID]()
SPLIT RANGE ('350000')
删除分区
编辑
ALTER PARTITION FUNCTION [PF_Source_ID_DT_ID]( ......
INSERT INTO
tableName ( columnName1, columnName2, columnName3, columnName4)
VALUES ( '45', '西藏办', TO_Date( '2010-03-10 12:00:00', 'YYYY-MM-DD HH24:MI:SS'), NULL,);
commit; ......