学习Microsoft SQL Server 2008技术内幕：T-SQL语法基础

第 2 章： 单表查询

use TSQLFundamentals2008;

select * from Sales.orders;

select empid, year(orderdate) as orderyear, Count(*) as numorders
from Sales.Orders
where custid=‘71‘
group by empid, year(orderdate)
having count(*) >1
order by empid, orderyear;

select empid, year(orderdate) as orderyear, Count(distinct custid) as custnum
from Sales.Orders
group by empid, year(orderdate)
order by empid, orderyear;

select * from HR.Employees;

select distinct country as cty, *  from HR.Employees
order by country;

select distinct country from HR.Employees as e
order by country;

select count(*) from Sales.Orders

select top(861) * from Sales.Orders

select top(5) orderid, orderdate, custid, empid
from Sales.Orders
order by orderdate desc

select top(5) orderid, orderdate, custid, empid
from Sales.Orders
order by orderdate desc, orderid desc

select top(5) with ties orderid, orderdate, custid, empid
from Sales.Orders
order by orderdate desc

--2.1.8 OVER 子句
select orderid, custid, val
from Sales.OrderValues;

select orderid, custid, val,
sum(val) over() as totalvalue,
sum(val) over(partition by custid) as custtotalvalue
from Sales.OrderValues;

select orderid, custid, val,
100. * val /sum(val) over() as totalvaluePer,
100. * val /sum(val) over(partition by custid) as custtotalvaluePer
from Sales.OrderValues;

select OV.orderid, OV.custid, ov.val,
 ROW_NUMBER() over(order by val, OV.orderid) as rownum,
 Rank() over(order by val) as rank,
 Dense_rank() over(order by val) as dense_rank,
 NTile(10) over(order by val) as ntile
from Sales.OrderValues as OV
order by val

select OV.orderid, OV.custid, ov.val,
 --ROW_NUMBER() over(order by val, OV.orderid) as rownum,
 --Rank() over(order by val) as rank,
 --Dense_rank() over(order by val) as dense_rank,
 NTile(10) over(order by val) as ntile
from Sales.OrderValues as OV
order by val

-----------------------------------------------------
select ov.val,
  ROW_NUMBER() over(order by val) as rownum
from sales.OrderValues as ov

select distinct ov.val,
  ROW_NUMBER() over(order by val) as rownum
from sales.OrderValues as ov

select val
from sales.OrderValues as ov
group by val

select ov.val,
  ROW_NUMBER() over(order by val) as rownum
from sales.OrderValues as ov
group by val

-----------------------------------------------------

-----------------------------------------------------
--2.3 Case子句
-----------------------------------------------------

select P.productid, p.productname, categoryid,
    Case categoryid
    when 1 then ‘Beverages‘
    when 2 then ‘Condimets‘
    when 3 then ‘Confe‘
    when 4 then ‘Beverages‘
    when 5 then ‘sdf‘
    when 6 then ‘asd‘
    when 7 then ‘ghh‘
    else ‘不知道‘
    end as Categoryname
from Production.Products as P

select orderid, custid,val,
   case
       when val<1000.00 then ‘< 100‘
       when val between 1000.00 and 3000.00 then ‘1000-3000‘
       when val > 3000.00 then ‘> 3000‘
       else ‘不知道‘
   end as valueCategory
from sales.OrderValues;

--2.4
select *
from Sales.Customers
where region=N‘WA‘

select *
from Sales.Customers
where region <> N‘WA‘

select *
from Sales.Customers
where region <>N‘WA‘ or region IS NULL

--------------------------------------
--2.5
--2.6.2
select *
from sys.fn_helpcollations()

select Len(‘abcde‘)
select Len(N‘abcde‘)
select dataLength(‘abcde‘)
select dataLength(N‘abcde‘)

select Len(‘abcde ‘)
select dataLength(N‘abcde ‘)
---2.7.5
select
GETDATE() as "GetDate",
CURRENT_TIMESTAMP as "CURRENT_TIMESTAMP",
SYSDATETIME() as "SYSDATETIME",
SYSUTCDATETIME() as "SYSUTCDATETIME",
SYSDATETIMEOFFSET() as "SYSDATETIMEOFFSET"

select
Cast(CURRENT_TIMESTAMP as date) as "date",
Cast(CURRENT_TIMESTAMP as time) as "time"

select
CURRENT_TIMESTAMP as "CURRENT_TIMESTAMP",
Cast(CURRENT_TIMESTAMP as date) as "date1",
Cast(CURRENT_TIMESTAMP as char(100)) as "date2"

select CONVERT(Char(8),CURRENT_TIMESTAMP, 112),
Cast(CONVERT(Char(8),CURRENT_TIMESTAMP, 112) as datetime)

select CONVERT(Char(12),CURRENT_TIMESTAMP, 114),
Cast(CONVERT(Char(12),CURRENT_TIMESTAMP, 114) as datetime),
Cast(CONVERT(Char(12),CURRENT_TIMESTAMP, 114) as datetime2)

select
DATEADD(year, 1, ‘20160526‘),
DATEADD(year, 1, CURRENT_TIMESTAMP)

select datediff(DAY,‘20080212‘, ‘20090212‘)

select
CURRENT_TIMESTAMP,
Datediff(day,‘20160501‘, CURRENT_TIMESTAMP),
DATEadd(day, Datediff(day,‘20160501‘, CURRENT_TIMESTAMP), ‘20160501‘)

select
CURRENT_TIMESTAMP,
Datediff(MONTH,‘20160501‘, CURRENT_TIMESTAMP),
DATEadd(MONTH, Datediff(MONTH,‘20160501‘, CURRENT_TIMESTAMP), ‘20160501‘)

select
CURRENT_TIMESTAMP,
Datediff(MONTH,‘20151231‘, CURRENT_TIMESTAMP),
DATEadd(MONTH, Datediff(MONTH,‘20151231‘, CURRENT_TIMESTAMP), ‘20151231‘)

select
CURRENT_TIMESTAMP,
Datediff(YEAR,‘20150101‘, CURRENT_TIMESTAMP),
DATEadd(YEAR, Datediff(YEAR,‘20150101‘, CURRENT_TIMESTAMP), ‘20150101‘)

select
CURRENT_TIMESTAMP,
Datediff(YEAR,‘19991231‘, CURRENT_TIMESTAMP),
DATEadd(YEAR, Datediff(YEAR,‘19991231‘, CURRENT_TIMESTAMP), ‘19991231‘)

select year(current_timestamp)
select year(‘20150527‘)

select datepart(month,‘20160212‘)
select datepart(month,CURRENT_TIMESTAMP)

select datename(month,CURRENT_TIMESTAMP)
select datename(month,‘20170202‘)

select *
from sys.tables;

select SCHEMA_NAME(schema_id),name as tablename
from sys.tables;

select * from sys.columns
select TYPE_NAME(system_type_id),
*
from sys.columns where object_id = OBJECT_ID(N‘Sales.Orders‘)

--2.6
exec sys.sp_help
@objname=N‘Sales.Orders‘

exec sys.sp_columns @table_name=N‘Orders‘, @table_owner=N‘Sales‘

--2.10
--2.10.1
select orderid, orderdate, custid, empid
from Sales.Orders as o
where o.orderdate > ‘20070531‘ and o.orderdate < ‘20070701‘

--2.10.2
select orderid, orderdate, custid, empid
from Sales.Orders as o
where o.orderdate= dateadd(month,datediff(month,‘19991231‘,o.orderdate),‘19991231‘)

--select DateDiff(MONTH,‘19991231‘,current_timestamp);
--select Dateadd(MONTH,DateDiff(MONTH,‘19991231‘,‘20160602‘),‘19991231‘);
select Dateadd(MONTH,DateDiff(MONTH,‘19991231‘,‘20160102‘),‘19991231‘);

select Dateadd(MONTH,DateDiff(MONTH,‘19990101‘,‘20160502‘),‘19990101‘);
select Dateadd(MONTH,DateDiff(MONTH,‘19990101‘,‘20160602‘),‘19990101‘);

select Dateadd(MONTH,DateDiff(MONTH,‘19991231‘,‘20160502‘),‘19991231‘);
select Dateadd(MONTH,DateDiff(MONTH,‘19991231‘,‘20160605‘),‘19991231‘);
select Dateadd(MONTH,DateDiff(MONTH,‘19991231‘,‘20160205‘),‘19991231‘);

--2.10.3
select empid, firstname, lastname
from hr.Employees as e
where e.lastname like N‘%a%a‘

----2.10.4
select * from
Sales.OrderDetails

select orderid, Sum(od.unitprice * od.qty) as totalValue
from Sales.OrderDetails as od
group by od.orderid
having Sum(od.unitprice * od.qty) > 10000
order by totalValue Desc

----2.10.5
select * from Sales.Orders

select top(3) o.shipcountry,AVG(o.freight) as avgfreight
from Sales.Orders as o
where o.orderdate >= ‘20070101‘ and o.orderdate < ‘20080101‘
group by o.shipcountry
order by AVG(o.freight) desc

----2.10.6
select custid, orderdate, orderid,
ROW_NUMBER() over(partition by custid order by orderdate,orderid) as rownum
from Sales.Orders

----2.10.7
select * from HR.Employees

select empid, firstname, lastname, titleofcourtesy,
 case titleofcourtesy
     when ‘Ms.‘ then ‘Female‘
     when ‘Mrs.‘ then ‘Female‘
     when ‘Mr‘ then ‘Male‘
     else ‘Unknown‘
 end as gender
 from HR.Employees

 select empid, firstname, lastname, titleofcourtesy,
 case titleofcourtesy
     when ‘Ms.‘ then ‘Female‘
     when ‘Mrs.‘ then ‘Female‘
     when ‘Mr‘ then ‘Male‘
     else ‘Unknown‘
 end as gender
 from HR.Employees

 select empid, firstname, lastname, titleofcourtesy,
 case
     when titleofcourtesy =‘Ms.‘ then ‘Female‘
     when titleofcourtesy =‘Mrs.‘ then ‘Female‘
     when titleofcourtesy =‘Mr‘ then ‘Male‘
     else ‘Unknown‘
 end as gender
 from HR.Employees

 select empid, firstname, lastname, titleofcourtesy,
 case
     when titleofcourtesy Like‘M%s.‘ then ‘Female‘
     when titleofcourtesy Like‘Mr‘ then ‘Male‘
     else ‘Unknown‘
 end as gender
 from HR.Employees

 select * from Sales.Customers

 select custid, region
 from Sales.Customers
 order by case when region is Null then 1 else 0 end ,region

 select custid, region
 from Sales.Customers
 order by case when region is Null then 4 else 3 end ,region

第 3 章 ：联接查询

Use TSQLFundamentals2008;
--3.1.1
select * from Sales.Customers as C
select * from HR.Employees as E
select *
from Sales.Customers as C
    cross join HR.Employees as E

--3.1.2
select * from Sales.Customers, HR.Employees;

--3.1.3
select E1.empid, E2.empid
from HR.Employees as E1 cross join HR.Employees as E2 

select E1.empid, E2.empid
from HR.Employees as E1 cross join HR.Employees as E2
order by E1.empid

select E1.empid, E2.empid
from HR.Employees as E1 cross join HR.Employees as E2
order by E1.empid,E2.empid

--3.1.4
use tempdb;
if OBJECT_ID(‘dbo.Digits‘) is not null drop table dbo.Digits
create table dbo.Digits(
    digit int not null primary key
)
insert into dbo.Digits(digit)
values(0),(1),(2),(3),(4),(5),(6),(7),(8),(9)

select D1.digit, D2.digit
from dbo.Digits as D1
     cross join dbo.Digits as D2

select D1.digit, D2.digit, D3.digit
from dbo.Digits as D1
     cross join dbo.Digits as D2
     cross join dbo.Digits as D3

select D3.digit * 100 + D2.digit * 10 + D1.digit + 1 as n
from dbo.Digits as D1
     cross join dbo.Digits as D2
     cross join dbo.Digits as D3
order by n

select D3.digit * 100 + D2.digit * 10 + D1.digit + 1 as n
from dbo.Digits as D1
     ,dbo.Digits as D2
     ,dbo.Digits as D3
order by n

--3.2.1
select *
from dbo.Digits as D1
     join dbo.Digits as D2 on D1.digit = D2.digit

--3.2.2
select *
from dbo.Digits as D1
     ,dbo.Digits as D2 where D1.digit = D2.digit

use TSQLFundamentals2008

--3.3.3
select C.custid, O.orderid
from Sales.Customers as C
     join Sales.Orders as O on c.custid=O.custid

select o.orderid, od.productid
from Sales.Orders as O
    JOIN Sales.OrderDetails AS OD on O.orderid=OD.orderid

select C.custid, O.orderid
from Sales.Customers as C
     join Sales.Orders as O on c.custid=O.custid

select C.custid,o.orderid, od.productid
from Sales.Customers as C
     JOIN Sales.Orders as O On c.custid= O.custid
     JOIN Sales.OrderDetails AS OD on O.orderid=OD.orderid

--3.4
--3.4.1

select q.custid, o.orderid
from Sales.Customers q
     join Sales.Orders o on q.custid= o.custid

select q.custid, o.orderid
from Sales.Customers q
    left join Sales.Orders o on q.custid= o.custid

select q.custid, o.orderid
from Sales.Customers q
    left join Sales.Orders o on q.custid= o.custid
where o.orderid is null

--
select C.custid ,COUNT(*)
from Sales.Customers  C
    left join Sales.Orders as O on c.custid=O.custid
group by C.custid

select C.custid ,COUNT(O.orderid)
from Sales.Customers  C
    left join Sales.Orders as O on c.custid=O.custid
group by C.custid

--3.6.1
set nocount on;
use TSQLFundamentals2008;
if OBJECT_ID(‘dbo.NUMS‘, ‘U‘) is not null drop table dbo.NUMS;
create table dbo.NUMS
(
    n int not null primary key
);

declare @i as int =1;
begin tran
    while @i <= 100000
    begin
       insert into dbo.NUMS(n) values(@i);
       set @i = @i + 1;
    end
commit tran
set nocount off;

--3.6.2
select E.empid,e.firstname, e.lastname, n.n
from HR.Employees as E
    join dbo.NUMS N on N.n < 5

select E.empid,e.firstname, e.lastname, n.n
from HR.Employees as E
    cross join dbo.NUMS N
where N.n < 5
order by n.n,  E.empid

select e.empid, DATEADD(day, n- 1,‘20090612‘) as dt
from HR.Employees as E
    Cross Join NUMS as D
where d.n <= datediff(day,‘20090612‘,‘20090616‘) + 1
order by e.empid

--3.6.2
select  C.custid,COUNT(O.orderid),Sum(OD.qty)
from Sales.Customers as C
    left join Sales.Orders as O on C.custid = O.custid
    left join Sales.OrderDetails as OD on O.orderid = OD.orderid
where C.country =‘USA‘
group by C.custid

select  C.custid,COUNT(distinct O.orderid),Sum(OD.qty)
from Sales.Customers as C
    left join Sales.Orders as O on C.custid = O.custid
    left join Sales.OrderDetails as OD on O.orderid = OD.orderid
where C.country =N‘USA‘
group by C.custid

--3.6.3
select C.custid, C.companyname, O.orderid, O.orderdate
from Sales.Customers as C
    Left Join Sales.Orders  as O on C.custid=O.custid

 --3.6.4
select C.custid, C.companyname, O.orderid, O.orderdate
from Sales.Customers as C
    Left Join Sales.Orders  as O on C.custid=O.custid
where O.orderid Is NUll

 --3.6.5
select C.custid, C.companyname, O.orderid, O.orderdate
from Sales.Customers as C
    Join Sales.Orders  as O on C.custid=O.custid
where orderdate =‘20070212‘

 --3.6.6
select C.custid, C.companyname, O.orderid, O.orderdate
from Sales.Customers as C
    Left Join Sales.Orders  as O on C.custid=O.custid
where orderdate =‘20070212‘ or O.orderdate is NUll

select C.custid, C.companyname, O.orderid, O.orderdate
from Sales.Customers as C
    Left Join Sales.Orders  as O on C.custid=O.custid and orderdate =‘20070212‘ 

--3.6.7
select C.custid, C.companyname, O.orderid, O.orderdate,
    Case
        when O.orderid Is Not null then ‘Yes‘
        else ‘NO‘
    End as HasOrderOn20170212
from Sales.Customers as C
    Left Join Sales.Orders  as O on C.custid=O.custid and orderdate =‘20070212‘
order by C.custid;

select distinct C.custid, C.companyname, O.orderid, O.orderdate,
    Case
        when O.orderid Is Not null then ‘Yes‘
        else ‘NO‘
    End as HasOrderOn20170212
from Sales.Customers as C
    Left Join Sales.Orders  as O on C.custid=O.custid and orderdate =‘20070212‘
order by C.custid;

时间： 2024-08-04 10:36:36

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