issue an item using FIFO

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I am designing web based stock control system using php and mysql.
I have two table in Database which is Receive item and issue item table
and here is the table structure
Receive tabale
Item Code Date Receive Receive number QuntityReceive.
xxx 2010-01-01 c12 10
yyy 2010-02-01 c15 20
xxx 2010-05-05 c34` 20
issue Table
ItemCode Date issue IssueNumber Quantity Issue
xxx 2010-03-03 c12 1
yyy 2010-02-01 c15 3
xxx 2010-05-05 c34` 6

and I want to issu item with FIFO Method ( first in first out Method) so please help me how to write SQL query

Posted 24-Mar-11 4:09am

Ruthi Eph

Updated 21-Oct-22 1:42am

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Manfred Rudolf Bihy · Answer 1 · 2011-03-24T04:20:00

Have a generated autoincrement key in your tables and lets call it "GenID". Then it's easy:

SQL

SELECT * FROM IssueTable WHERE GenID = (SELECT MIN(GenID) FROM IssueTable)

Same for the other table:

SQL

SELECT * FROM ReceiveTable WHERE GenID = (SELECT MIN(GenID) FROM ReceiveTable)

If you're done with the processing of the fetched record delete that entry from the correspoding table and have a trigger on delete make a copy of that record to some transaction history table. By selecting the record with the smallest GenID you'll alway fetch records after the FIFO pattern.

(My first thouhgt was to use DateTime, but if the records are inserted in very fast succession the precision of dateteime might not be adequate.)

Best Regards,