Compare between two tables

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Hello,

i'm developing a windows application where it will convert textfile to sql compact database.this converted data from textfile will be stored in table 1.
table 1 have 2 colums,itemcode and qty:
itemcode qty
111111 3
111112 2
111113 4

and i have table 2 with 4 colums ,location,itemcode,snnumber,qty;
location itemcode snnumber qty
LG , 111111 566655 1
LG , 111111 565656 1
LG , 111111 565656 1

means in table 2,i have qty with all fixed to 1.lets say got 3 same items,i will store as 3 different items.but in table 1,it will show the quantity as 3.

so,now i want to compare these two tables,so that itemcode in table 1 exists in table2,and vice versa..and i want a produce a report in csv or excel file, the variance,and the quantity.
is this possible?if yes,how?can anyone guide me..

Posted 23-Mar-11 22:20pm

pwtc222

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Perry Bruins · Answer 1 · 2011-03-24T11:04:00

Solution 1

Not really understand your question. It looks like you can fill table 1 with info from table 2 using a SQL group by construct like:

select itemcode, sum(quantity)
from table2
group by itemcode

what is exaclty your question?

Posted 24-Mar-11 11:04am

Perry Bruins

JOAT-MON · Answer 2 · 2011-03-24T13:04:00

If I understand your question, you will need a query that utilizes sub-queries and inner join to generate the appropriate resulting table. I think it would be something similar to this:

SQL

SELECT 
    tbl1.itemcode, 
    tbl1.T1Quantity, 
    tbl2.T2Quantity, 
    (tbl1.T1Quantity - tbl2.T2Quantity) AS Variance 
FROM 
    ( SELECT 
          itemcode, 
          qty AS T1Quantity 
      FROM 
          table1
    ) AS tbl1 INNER JOIN 
    ( SELECT 
          itemcode, 
          SUM(qty) AS T2Quantity 
      FROM 
          table2 
      GROUP BY 
          itemcode
    ) AS tbl2 ON tbl1.itemcode = tbl2.itemcode

[EDIT: version without subqueries in FROM clause]

SQL

SELECT
    Table1.itemcode, 
    Table1.qty AS T1Quantity, 
    SUM(Table2.qty) AS T2Quantity, 
    Table1.qty - SUM(Table2.qty) AS Variance
FROM
    Table1 INNER JOIN
    Table2 ON Table1.itemcode = Table2.itemcode
GROUP BY 
    Table1.itemcode, 
    Table1.qty