Question

CREATE TABLE Temp_Account
(
   ID Int IDENTITY(1,1),
   AccountNo Varchar(500)
)

.......................................

INSERT INTO Temp_Account
SELECT 'AE000111'
UNION ALL
SELECT 'AE000112'
UNION ALL
SELECT 'AE000113'
UNION ALL
SELECT 'AE000114'
UNION ALL
SELECT 'AE000115'

........................................

 CREATE PROCEDURE Temp_AccountProc
(
   @AccountNo    Varchar(500)
)
AS
BEGIN

   SELECT ID
   FROM   Temp_Account
   WHERE  AccountNo     =      @AccountNo

  END


   EXEC Temp_AccountProc 'AE000111'

   EXEC Temp_AccountProc 'AE000112'

   EXEC Temp_AccountProc 'AE000113'

   EXEC Temp_AccountProc 'AE000111'

   EXEC Temp_AccountProc 'AE000111'

   EXEC Temp_AccountProc 'AE000112'

我想知道表中最常用的值。是否有任何DMV或任何方法来查找给定的输出？

 ------------------------------------
    AccountNo          UsedCount
  ------------------------------------

      AE000111            3

      AE000112            2

      AE000113            1

Answer 1

向表中添加新列或创建另一个临时表，其列为UsedCount和AccountNo，
在您的程序中，当选择了帐户号时，也选择该帐号的已用计数列值
增加使用的次数
执行更新语句以更新该AccountNo的使用计数

Answer 2

试试这个：

添加[UsedCount]列
当呼叫程序设置[UsedCount] + 1

CREATE TABLE Temp_Account
(
   ID Int IDENTITY(1,1),
   AccountNo Varchar(500),
   [UsedCount]  int
)
INSERT INTO Temp_Account
SELECT 'AE000111',0
UNION ALL
SELECT 'AE000112',0
UNION ALL
SELECT 'AE000113',0
UNION ALL
SELECT 'AE000114',0
UNION ALL
SELECT 'AE000115',0
;

CREATE PROCEDURE Temp_AccountProc
(
   @AccountNo    Varchar(500)
)
AS
BEGIN

   SELECT ID
   FROM   Temp_Account
   WHERE  AccountNo     =      @AccountNo

   update Temp_Account
   set [UsedCount] = [UsedCount] +1
   WHERE  AccountNo     =      @AccountNo

END

   EXEC Temp_AccountProc 'AE000111';
   EXEC Temp_AccountProc 'AE000112';
   EXEC Temp_AccountProc 'AE000113';
   EXEC Temp_AccountProc 'AE000111';
   EXEC Temp_AccountProc 'AE000111';
   EXEC Temp_AccountProc 'AE000112';

   select * from Temp_Account
   where [UsedCount] > 0;

<强>结果：

| ID | AccountNo | UsedCount|
|----|-----------|-------------|
|  1 |  AE000111 |           3 |
|  2 |  AE000112 |           2 |
|  3 |  AE000113 |           1 |

SQL Fiddle Demo Link

在SQL中查找表中最常用的值

2 个答案: