SQLServer學習筆記系列12

一.寫在前面的話

這個sql學習系列，今天准備告一段落，雖然短短的十幾篇文章，深刻感受到將學習的東西記錄下來，是需要一種堅持！

這些東西只有反復的學習吸收，最終沉淀下來的才是屬於自己的知識。也是提醒自己，今后的日子更要有計划，轉眼又是7月份了，

時間不等人，歲月不饒人！堅持自己的計划，堅持向往的東西，踏實學習，因為自己不會的還太多，那些大牛還在學習，

我就更沒理由逃避！也希望結交一些朋友，一起討論技術，一起學習，一起進步！

  

 

二.觸發器

觸發器是一種特殊類型的存儲過程，不能被顯示的執行。它所監控的是對某一個表的操作，然后對應的執行相應的sql語句。

常見的觸發器有三種：分別應用於Insert , Update , Delete 事件。觸發器沒有參數。 分為：after觸發器instead of 觸發器。

實例:審核貨運公司表，表發生了操作以后，記錄日志。用觸發器監控。

1.創建日志表，記錄對貨運公司的操作：

USE TSQLFundamentals2008;
 IF OBJECT_ID('shipper_log') IS NOT NULL
 DROP TABLE shipper_log;
 CREATE TABLE shiiper_log
 (
 logId INT IDENTITY(1,1) PRIMARY KEY,
 opdate  datetime DEFAULT GETDATE(),
 opuser nvarchar(200),
 op nvarchar(200),
 shipname nvarchar(200),
 shipphone nvarchar(200)
 )

2.創建審核貨運公司的觸發器：

 
CREATE TRIGGER tg_ship
ON  sales.shippers AFTER INSERT ,DELETE,UPDATE
as 
INSERT INTO dbo.shiiper_log
        ( opdate ,
          opuser ,
          op ,
          shipname ,
          shipphone
        )
SELECT GETDATE() , -- opdate - datetime
          CURRENT_USER , -- opuser - nvarchar(200)
          N'插入' , -- op - nvarchar(200)
          companyname, -- shipname - nvarchar(200)
         phone  -- shipphone - nvarchar(200)
        FROM INSERTED;

3.創建完成觸發器以后，我們可以查看一下記錄貨運公司日志表里面的內容：

SELECT * FROM dbo.shiiper_log;

可以看到數據為空，當我們向貨運公司插入一條記錄如何了？

INSERT INTO Sales.Shippers
        ( companyname, phone )
VALUES  ( N'Isoftstone', -- companyname - nvarchar(40)
          N'15377541070'  -- phone - nvarchar(24)
          )

插入以后，我們再查看一下多貨運公司操作的記錄表：

SELECT * FROM dbo.shiiper_log;

我們看到插入一條記錄以后，執行消息里面受影響行數有兩條：

我們繼續查詢下日志表記錄：

SELECT * FROM dbo.shiiper_log;

這就實現了對貨運公司操作的監控，從日志表里面就可以看到貨運公司表里面操作的記錄。

 

三.獲取標識問題

標識列有利於相當於一個特殊標記，我們可以根據標識列很容易的去查看數據。

（1）獲取系統提供的標識值，整個系統范圍內。

INSERT INTO Sales.Shippers
        ( companyname, phone )
VALUES  ( N'Isoftstone', -- companyname - nvarchar(40)
          N'15377541070'  -- phone - nvarchar(24)
          )
          
          --整個系統范圍內    
          SELECT @@IDENTITY;

我們先向貨運公司表里面插入一條記錄，然后查詢系統的標識值，由於貨運公司表做了觸發器處理，所以插入一條記錄時候，同時向貨運公司

日志表里面也插入了一條記錄。所以我們在查詢系統當前的標識值時，查詢到的是最新的系統范圍內的標識值。

（2）獲取當前作用域中最新的的標識值。

          --當前作用域內最新的標識值
          SELECT SCOPE_IDENTITY();

通過查詢貨運公司表可以看到當前作用域內最大的標識值為8.

這個學習系列寫完，讓自己也學會了很多，知道做一件事情堅持下去，才會讓自己成長！

腳踏實地，一步一步踏踏實實走下去，相信越努力越幸運！后續會繼續學習，

永遠相信美好的事情即將發生！希望各位大牛給出指導，不當之處虛心接受學習！謝謝！

這里分享下這個系列所寫的sql腳本。

select top 10 * from A where ID
not in(select top 30 ID from A  order by ID asc)
order by ID asc

select top 10 * fron A where ID>
(select Max(ID) from (select top 30 ID from A order by ID)as t)
order by ID asc

select top 10 * from A a1 
WHERE NOT EXISTS 
(SELECT * from 
(SELECT TOP 30 * FROM A ORDER BY id asc) a2
WHERE a2.id =a1.id 
)

select top(20) percent * from hr.employees  

select count(*) as N'總人數' from hr.employees

select top 5 with ties orderid,orderdate
from sales.orders order by orderdate  desc

select firstname,lastname ,count(*) over()  as N'總人數'
from hr.employees

select orderid,custid,sum(val) over (partition by custid) as N'顧客消費總額',
sum(val) over() as N'訂單總額' from sales.ordervalues

select country,ntile(3) over (order by country) as N'ntile分組',dense_rank() over(order by country) as N'dense_rank排名', lastname,firstname
from hr.employees
order by country

select lastname,firstname,country,row_number() over( partition by country order by country) as N'排名'
from hr.employees

select * from sales.ordervalues
where val>=1000 and val<=2000

select * from sales.ordervalues
where val between 1000 and 2000


select * from sales.ordervalues
where custid=1 or custid=2 or custid=9


select * from sales.ordervalues
where custid in(1,2,9)
 
 
 select * from Hr.employees
 where lastname like '%a%'
 
 declare @t char(10);
 set @t='hello';
 set @t=isnull(@t,'')+'world';
 print datalength(rtrim(@t)

 
 select productname,replace(productname,'Product','產品名')
 from production.products
 
 
 select productname,stuff(productname,8,1,'::::')
 from production.products
 
  select productname,upper(productname),lower(productname)
 from production.products
 
 
 declare @s char(10);
 set @s='hello';
 select  datalength(rtrim(@s));
 print len(@s);
 
 
 select firstname,lastname,
 case region
 when 'WA' then '華盛頓地區'
 else '其他地區'
 end
 from hr.employees
 
 select firstname,lastname,region
 from hr.employees
 
 
 select firstname,lastname,
 case when region ='WA' then '華盛頓地區'
      when region is null then '未知地區'
 else '其他地區'
 end
 from hr.employees
 
 select * from sales.orders
 where orderdate>'20080301'
 
 select * from sales.orders
 where orderdate>cast('20080301' as datetime)
 
 select datepart(year,getdate()) as N'年份',
        datepart(month,getdate()) as N'月份',
        datepart(day,getdate()) as N'日',
        datepart(hour,getdate()) as N'時',
        datepart(minute,getdate()) as N'分',
        datepart(second,getdate()) as N'秒'

  select datepart(dayofyear,getdate()) as N'一年中的第幾天',
        datepart(weekday,getdate()) as N'一星期中第幾天',
        datepart(week,getdate()) as N'今年的第幾周'
 
 select dateadd(day,20,getdate()) as N'20天后的是什么日子',
        datediff(year,'19491001',getdate()) as N'祖國成立這么多年啦',
        datediff(year,'19911002',getdate()) as N'屌絲多大啦'
        
        
 select convert(nvarchar,getdate(),112) as N'轉化后的形式',
       left( convert(nvarchar,getdate(),112),6) as N'取出年月'
       
       
       
 select orderid,custid,empid from sales.orders
 
 
 select * from hr.employees;
 select * from sales.shippers;
 
 select a.*,b.*
 from hr.employees a cross join sales.shippers b;
 
 select * from production.categories 
 select * from production.products 
 
 select a.categoryid,a.categoryname,b.productid,b.productname
 from production.categories a inner join production.products b
 on a.categoryid=b.categoryid;
 
 select * from sales.customers
 select * from sales.orders
 
 select  a.custid,b.custid,a.contactname,a.fax,
        count(b.orderid) as N'顧客訂單數量'
 from sales.orders b right join sales.customers a 
 on a.custid=b.custid 
 group by a.custid ,a.fax,a.contactname,b.custid 
 order by count(b.custid);
 
 select distinct orderdate,count(*) as N'每日訂單量' from sales.orders
 where orderdate between '20080101' and '20081231'
 group by orderdate
 
 create table nums
 (
   n int
 );
 
 select * from nums;
 
 
 declare @i int;
 set @i=0;
 while @i<400
 begin
 set @i=@i+1;
 insert into nums(n) values(@i);
 end
 
 
 select dateadd(day,f.n,'20071231'),count(orderid) as N'每日訂單數量'
 from nums f  left join sales.orders m on
  dateadd(day,f.n,'20071231')= m.orderdate
  group by dateadd(day,f.n,'20071231')
  order by dateadd(day,f.n,'20071231')
  
  select birthdate,lastname
  from hr.employees
  where birthdate=
  (
      select max(birthdate) 
      from hr.employees
  )
  
  select * from Sales.OrderValues
  
  select custid,contactname,country
  from sales.customers where custid=
  (
              select custid from Sales.OrderValues
              where val=
            (
              select max(val) as N'最貴訂單'
               from Sales.OrderValues
             )
  )
  
  select * from sales.customers
  
  
  SELECT distinct country from  sales.customers
  where country not in
  (
  select  country from production.suppliers
  )
  
  select custid, count(*) as N'訂單數量' from sales.orders
  group by custid order by custid
  
  
  select distinct custid,count(*)  over (partition by custid) as N'訂單數量'
  from sales.orders
  
  select n.custid,n.contactname,
  (
  select count(*) 
  from sales.orders m 
  where m.custid=n.custid
  ) as N'訂單數量'
  from sales.customers n
  
  select distinct m.country from sales.customers m
  where  not exists 
  (
      select n.country from production.suppliers n
      where   n.country= m.country 
  )
  
  
  select distinct  
  (
     select max(custid) from 
     sales.orders m where m.custid< n.custid
  ) as N'前一個訂單',n.custid as N'當前訂單',
    (
     select min(custid) from 
     sales.orders p where p.custid> n.custid
  ) as N'后一個訂單'
  from sales.orders n
  
select n.orderyear,
(
   select sum(qty)
   from  Sales.OrderTotalsByYear  m
   where m.orderyear<=n.orderyear
) as N'累計訂單數量'
 from  Sales.OrderTotalsByYear n
 order by n.orderyear;
 
 
 SELECT * FROM
 (
 SELECT custid,COUNT(*) OVER(PARTITION BY country)
 FROM Sales.Customers
 ) t(custid,顧客數量)
 
 
 DECLARE @country NVARCHAR(300);
 SET @country='UK';
 WITH USE_Customers(公司名,國家名)
 AS
 (
   SELECT companyname ,country 
   FROM Sales.Customers 
   WHERE country=@country
 )
 
 SELECT * FROM USE_Customers
 
 
 SELECT YEAR(orderdate) AS N'年度',custid,COUNT(*) AS N'訂單數量'
 FROM Sales.Orders 
 GROUP BY YEAR(orderdate),custid
 HAVING COUNT(*) >10;
 
 --(1)
 SELECT  YEAR(orderdate) AS orderyear,custid
 FROM Sales.Orders
 
 --(2)
 SELECT orderyear,custid,COUNT(*) AS N'訂單數量'
 FROM
 (
     SELECT  YEAR(orderdate) AS orderyear,custid 
     FROM Sales.Orders
 ) AS t1
 GROUP BY orderyear,custid
 
 
 --(3)
 SELECT orderyear,custid,ordercount
 FROM
 (
 SELECT orderyear,custid,COUNT(*) AS  ordercount
 FROM
         (
             SELECT  YEAR(orderdate) AS orderyear,custid 
             FROM Sales.Orders
         ) AS t1
         GROUP BY orderyear,custid
 ) AS t2
 WHERE ordercount >10
 
 
 WITH yearorder01
 AS
 (
       SELECT YEAR(orderdate) AS orderyear,custid
       FROM Sales.Orders
 ),
 yearorder02
 AS 
 (
         SELECT orderyear,custid,COUNT(*) AS ordercount
         FROM yearorder01
         GROUP BY orderyear,custid
 ),
 yearorder03
 AS
 (
        SELECT orderyear,custid,ordercount
        FROM yearorder02
        WHERE  ordercount>10
 )
 
 
 SELECT * FROM yearorder03
 
 
 SELECT pre_orderyear,now_orderyear,pre_custcount,now_custcount,
       (now_custcount-pre_custcount) AS N'顧客數量差'
 FROM 
 (
 SELECT YEAR(orderdate) AS now_orderyear,COUNT(DISTINCT custid) AS now_custcount 
 FROM Sales.Orders
 GROUP BY YEAR(orderdate)
 ) AS t1
 LEFT JOIN 
 (
  SELECT YEAR(orderdate) AS pre_orderyear,COUNT(DISTINCT custid) AS  pre_custcount
 FROM Sales.Orders
 GROUP BY YEAR(orderdate)
 ) AS t2
 ON t1.now_orderyear=t2.pre_orderyear+1;
 
 WITH custcount
 AS
 (
 SELECT YEAR(orderdate) AS orderyear,COUNT(DISTINCT custid) AS  custcount
 FROM Sales.Orders
 GROUP BY YEAR(orderdate)
 )
 
 SELECT t1.orderyear AS nowYear,t2.orderyear AS preYear,t1.custcount AS nowcount,t2.custcount AS precount,
       (t1.custcount-t2.custcount) AS N'顧客數量差'
 FROM custcount t1
 LEFT JOIN  custcount t2
 ON t1.orderyear=t2.orderyear+1;
 
 
 SELECT t1.empid,t1.mgrid,t1.lastname,t2.empid,t2.lastname
 FROM HR.Employees t1 LEFT JOIN hr.Employees t2 
 ON t1.mgrid =t2.empid
 
 

 SELECT * FROM HR.Employees
 WHERE mgrid in
 (SELECT empid FROM 
 hr.Employees WHERE mgrid=2
 ) 

DECLARE @mgrid INT;
SET @mgrid=2;
WITH Emplist
AS
(
    --此處為起點，執行一次
    SELECT empid,lastname,mgrid
    FROM HR.Employees
    WHERE mgrid=@mgrid
    UNION ALL
    
    --遞歸開始
    
    SELECT e.empid,e.lastname,e.mgrid
    FROM HR.Employees e INNER JOIN Emplist m
    ON e.mgrid=m.empid 
    
)

SELECT * FROM Emplist



CREATE VIEW USA_cusomers
AS 
(
   SELECT * FROM 
   sales.customers
   WHERE country='USA'
)

SELECT custid,country FROM dbo.USA_cusomers;
DROP VIEW dbo.USA_cusomers;


SELECT country
FROM Sales.Customers
UNION 
SELECT country
FROM hr.Employees;

SELECT country
FROM Sales.Customers
intersect 
SELECT country
FROM hr.Employees;


SELECT country
FROM Sales.Customers
EXCEPT 
SELECT country
FROM hr.Employees;


IF OBJECT_ID('dbo.orders','U') IS NOT NULL
DROP TABLE dbo.orders;
CREATE TABLE dbo.orders
(
   orderid int NOT NULL  PRIMARY KEY,
   empid int NOT NULL,
   custid int NOT NULL,
   orderdate datetime,
   qty int 
);

INSERT INTO dbo.orders(orderid,empid,custid,orderdate,qty)
VALUES (30001,3,1,'20070802',10),
       (30002,2,4,'20070601',20),
        (10001,4,5,'20070802',30),
        (20001,5,2,'20070802',40),
        (40001,3,2,'20070802',50),
        (30006,5,6,'20070802',50),
        (30008,4,8,'20070802',60),
        (60001,6,1,'20070802',70)

SELECT * FROM dbo.orders

SELECT empid,SUM(qty) AS N'顧客消費金額'
FROM dbo.orders
GROUP BY empid;

SELECT empid,
SUM(CASE when empid=2 THEN qty end) AS N'2號顧客消費金額',
SUM(CASE when empid=3THEN qty end) AS N'3號顧客消費金額',
SUM(CASE when empid=4 THEN qty end) AS N'4號顧客消費金額',
SUM(CASE when empid=5 THEN qty end) AS N'5號顧客消費金額',
SUM(CASE when empid=6 THEN qty end) AS N'6號顧客消費金額'
FROM dbo.orders
GROUP BY empid;


SELECT empid,[1],[2],[4],[6],[8]
FROM 
(  
    --只返回pivot中用到的列
   SELECT empid,qty,custid
   FROM dbo.orders
) AS t
PIVOT (
     SUM(t.qty) FOR t.custid IN ([1],[2],[4],[6],[8])--做列名稱
) AS P



USE TSQLFundamentals2008;

SELECT * FROM sales.Shippers

INSERT INTO Sales.Shippers
        ( companyname, phone )
VALUES  ( N'順風', -- companyname - nvarchar(40)
          N'0277665555'  -- phone - nvarchar(24)
          ),
          (N'申通',
           N'027888223'),
           (
           N'中通',
           N'0274433332'
           )
          
          
          DELETE FROM Sales.Shippers WHERE shipperid=6
          
       SELECT * FROM sales.Shippers   
       
       
       BEGIN TRANSACTION;
       
        DELETE FROM Sales.Shippers WHERE shipperid=4;
        DELETE FROM Sales.Shippers WHERE shipperid=5;
        
        COMMIT;
        
        
        
       BEGIN TRANSACTION;
       
        UPDATE  Sales.Shippers SET companyname='abc' WHERE shipperid=1;
        UPDATE  Sales.Shippers SET companyname='XYZ' WHERE shipperid=2;
        
        COMMIT;
         KILL 53

USE TSQLFundamentals2008;

BEGIN TRANSACTION;

UPDATE Production.Products 
SET unitprice=unitprice+1
WHERE productid=2;



--TSQL編程
--定義變量
DECLARE  @s INT;
SET @s=10;
PRINT @s;


DECLARE @str NVARCHAR;
SET @str ='Hello World';
PRINT @str;

DECLARE @m NVARCHAR(100);
SELECT @m=99;
PRINT @m;

DECLARE @sum INT;
SELECT @sum=COUNT(*) FROM Sales.Customers;
PRINT @sum;



DECLARE @mi DATETIME;
SET @mi=DATEPART(MINUTE,GETDATE());
IF(@mi>10)
PRINT '該睡覺了！';
ELSE
PRINT '繼續學習！'

DECLARE @sumadd int;
DECLARE @k INT;
SET @k=0;
SET @sumadd=0;
WHILE @k<100
BEGIN
     SET @K=@K+1;
     SET @sumadd=@sumadd+@k;
END
PRINT @sumadd;


SELECT  companyname
FROM  Sales.Customers;

DECLARE @name NVARCHAR(100);
SELECT @name=companyname
FROM Sales.Customers;
PRINT @name;


--1.聲明游標,基於查詢
DECLARE c CURSOR
FOR
SELECT companyname
FROM Sales.Customers;

DECLARE @name NVARCHAR(100);

--2.在使用時候,必須打開游標
OPEN c;

--3.從游標中讀取數據,每次可以讀取出來一條數據
FETCH NEXT FROM c INTO @name;

--4.注意fetch,並不一定能獲得實際的數據
WHILE  @@fetch_status=0
BEGIN
PRINT @name;
FETCH NEXT FROM c INTO @name;

END;

--5.游標使用完成以后,一定要關閉
CLOSE c;

--6.釋放游標
DEALLOCATE c;

--存儲過程
CREATE PROCEDURE ModifyPrice
(
  @num money
  
)
AS
UPDATE Production.Products
SET unitprice=unitprice+@num;


CREATE PROCEDURE GetCustomersCount
(
 @count int OUTPUT 
)
AS
DECLARE  @num INT;
SELECT        @num=COUNT(*) FROM Sales.Customers;

--傳出

SET @count=@num;
go

--必須使用變量來保存傳出的參數
DECLARE @myCount int;

--前面是參數中定義的傳出參數
--后面是我們定義的用來保存輸出結果的變量

EXEC GetCustomersCount @count=@myCount OUTPUT;

PRINT @myCount;              



--創建用戶
CREATE PROCEDURE CreateUser
(
   @username nvarchar(100)
)           
AS
DECLARE @namelen INT;
SET @namelen=LEN(@username);

IF    @namelen>5
RETURN 0
ELSE
RETURN 1 ;

GO
--定義變量保存結果

DECLARE @ReturnValue INT;
EXEC  @ReturnValue=dbo.CreateUser @username = N'liupeng'  -- nvarchar(100)
PRINT @ReturnValue;

--創建函數
CREATE FUNCTION Getminnutes
(
 @datevalue datetime  --傳入參數
)
--函數可以直接返回一個值
RETURNS int
AS
begin
 --函數體
 DECLARE @mi INT;
 SET @mi=DATEPART(MINUTE,@datevalue);
 RETURN @mi;
 END;

SELECT dbo.Getminnutes(GETDATE())


--創建數據庫testDB
if DB_ID('testDB') is not NULL
DROP DATABASE testDB;
CREATE DATABASE testDB ;
go
IF OBJECT_ID('testTable') IS NOT NULL
DROP TABLE testTable;
CREATE TABLE testTable
(
id INT IDENTITY(1,1) PRIMARY KEY NOT NULL,
userName NVARCHAR(200) NOT NULL,
userPWD  NVARCHAR(200) NOT NULL,
userPhone NVARCHAR(200) NOT NULL
)

go 


 --插入數據 
 set identity_insert testTable on  --設置為on時，可以向標識列中插入
 declare @count int 
 set @count=1 
 while @count<=322446 
 begin  
    insert into testTable(id,userName,userPWD,userPhone) values(@count,'liupeng','liupeng_IT','@[e-mail]') 
     set @count=@count+1 
end 
set identity_insert testTable off


SELECT * FROM testTable


 create procedure proc_pagedFenye_with_selectMax  --利用select top and select max(列) 
 ( 
     @pageIndex int,  --頁索引 
     @pageSize int    --頁記錄數 
 ) 
 as 
 begin 
 set nocount on; 
     declare @timediff datetime 
   declare @sql nvarchar(500) 
    select @timediff=Getdate() 
    set @sql='select top '+str(@pageSize)+' * From testTable where(ID>(select max(id) From (select top '+str(@pageSize*@pageIndex)+' id From testTable order by ID) as TempTable)) order by ID' 
   execute(@sql) 
   select datediff(ms,@timediff,GetDate()) as 查詢時間
set nocount off; 
END

EXEC proc_pagedFenye_with_selectMax 10,10



create procedure proc_pagedFenye_with_notin  --利用select top and select not in 
(     
     @pageIndex int,  --頁索引 
     @pageSize int    --每頁記錄數 
) 
 as 
 begin 
    set nocount on; 
    declare @timediff datetime --耗時 
    declare @sql nvarchar(500) 
    select @timediff=Getdate() 
    set @sql='select top '+str(@pageSize)+' * from testTable where(ID not in(select top '+str(@pageSize*@pageIndex)+' id from testTable order by ID ASC)) order by ID'     execute(@sql)  --因select top后不支技直接接參數，所以寫成了字符串@sql 
    select datediff(ms,@timediff,GetDate()) as 查詢時間 
    set nocount off; 
END

EXEC proc_pagedFenye_with_notin 10,10


create procedure proc_pagedFenye_with_Rownumber  --利用SQL 2005中的Row_number() 
 ( 
    @pageIndex int, 
    @pageSize int 
 ) 
 as 
 begin 
 set nocount on;
    declare @timediff DATETIME;  
    select @timediff=getdate() 
    select * from (select *,Row_number() over(order by ID asc) as IDRank from testTable) as IDWithRowNumber where IDRank>@pageSize*(@pageIndex) and IDRank<@pageSize*(@pageIndex+1) 
    select 3 as 查詢時間 
set nocount off; 
END


EXEC proc_pagedFenye_with_Rownumber 10,10


select * from (select *,Row_number() over(order by ID asc) as IDRank from testTable) as IDWithRowNumber where IDRank>10*(10-1) and IDRank<10*(10+1) 

SELECT* FROM testTable


USE TSQLFundamentals2008;
SET NOCOUNT ON;
SELECT TOP 5  *  FROM Sales.Customers



--觸發器
USE TSQLFundamentals2008;
 IF OBJECT_ID('shipper_log') IS NOT NULL
 DROP TABLE shipper_log;
 CREATE TABLE shiiper_log
 (
 logId INT IDENTITY(1,1) PRIMARY KEY,
 opdate  datetime DEFAULT GETDATE(),
 opuser nvarchar(200),
 op nvarchar(200),
 shipname nvarchar(200),
 shipphone nvarchar(200)
 )
 
CREATE TRIGGER tg_ship
ON  sales.shippers AFTER INSERT ,DELETE,UPDATE
as 
INSERT INTO dbo.shiiper_log
        ( opdate ,
          opuser ,
          op ,
          shipname ,
          shipphone
        )
SELECT GETDATE() , -- opdate - datetime
          CURRENT_USER , -- opuser - nvarchar(200)
          N'插入' , -- op - nvarchar(200)
          companyname, -- shipname - nvarchar(200)
         phone  -- shipphone - nvarchar(200)
        FROM INSERTED;


SELECT * FROM dbo.shiiper_log;


INSERT INTO Sales.Shippers
        ( companyname, phone )
VALUES  ( N'Isoftstone', -- companyname - nvarchar(40)
          N'15377541070'  -- phone - nvarchar(24)
          )
          
          --整個系統范圍內    
          SELECT @@IDENTITY;
          
          --當前作用域內最新的標識值
          SELECT SCOPE_IDENTITY();
          
          select  * FROM Sales.Shippers;