comparring two table values in access

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Hi friends,
I am using MS-Access as db in C# .net Windows Application
I have Two Table as temp & Count.
temp table Column are
ItemCode as Number,
ItemName as text,
Qty as number,

Count table column are
ItemCode as Number,
ItemName as text,
Count as number,

In temp table values are

ItemCode            ItemName             Qty
  5                    fish                2
  2                    rice                2
  3                    chicken             3
  1                    bone less fish      3
  5                    fish                4
  2                    rice                3
  3                    chicken             4
  1                    bone less fish      6

Count Table Values

ItemCode            ItemName             Count
  1                    bone less fish      0  
  2                    rice                0
  3                    chicken             0
  5                    fish                0

I want to Update the Count table as

ItemCode            ItemName             Count
  1                    bone less fish      9  
  2                    rice                5
  3                    chicken             7
  5                    fish                6

How can i update the count table like this Pleas Help me

Thanks With Regards
Dineshkumar R

Posted 1-Jun-11 1:06am

R_D_K

Updated 1-Jun-11 1:07am

v2

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karan joshua · Answer 1 · 2011-06-01T01:14:00

Solution 1

i think you have used foreign key concept to link the tables ...

then just pass the query ..

use select query

and in while(reader.read())
{

write your update query to increment the count
}

Posted 1-Jun-11 1:14am

karan joshua

Comments

R_D_K 1-Jun-11 8:42am

that update command only i asking

yesotaso · Answer 2 · 2011-06-01T01:41:00

Step 1: Read in temporary table with query:

SQL

SELECT ItemCode, SUM(Qty) as Cnt FROM temp GROUP BY temp.ItemCode

Step 2: While reading values from that query

C#

while(reader.read())
{
    //Here build your update query on a new OLEDBCommand
    string sqlString="UPDATE Count1 SET Cnt=? Where ItemCode=?"
    //Build your update command
    myCommand.Parameters.Add(@"Count",/*Put your Item Count which is read from reader*/);
    myCommand.Parameters.Add(@"ItemCode",/*Put your Item Code*/);
    // Other stuff if you want to
    myCommand.ExecuteNonQuery();
}

I hope this clears it.

[Edit]Below is for SQL Server Sorry about that I missed "Access" tag.

SQL

UPDATE [Count] set [Count].[Count] = tmp.cnt FROM (SELECT ItemCode, SUM(Qty) as cnt FROM temp GROUP BY temp.ItemCode) as tmp WHERE [Count].ItemCode=tmp.ItemCode

Advice: Do not give Table/Column names which has other meanings in the database like "Count".