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Question

I have the following tables
create table table_one
       table_id varchar2(40),
       location_place varchar2 (100)
);made using the following insert statement
insert into table_one
    (table_id, location_place)
values
    ('g1223', 'NEWYORK');
insert into table_one
    (table_id, location_place)
values
    ('g1224', 'BOSTON');
insert into table_one
    (table_id, location_place)
values
    ('g1225', 'DALLAS');
insert into table_one
    (table_id, location_place)
values
    ('g1226', 'NEWYORK');
insert into table_one
    (table_id, location_place)
values
    ('g1226', 'PARIS');
insert into table_one
    (table_id, location_place)
values
    ('g1226', 'ABIDJAN');
    now my question is, I have the idea in my mind already but the syntax is the main problem since I am still a beginer in oracle. I can do this easily in visual.studio.net but I have to do it first in oracle to test it out and see whether it works.
question
I am trying to create a simple interface whereby from the above table, three table_id will be displayed and basically what happens is the user has to look for those three table_id physically in the real world. Now if those table_id has been found, the user is able to enter a simple input like Y or 1 which signify found and N or 0 signify not found. Now once the input are entered, those table_id are transferred to a new table called table_two. see code
create table table_two
       table_id varchar2(40),
       location_place varchar2 (100)
);THe idea of using a table_two is to prevent the same table_id from being picked and looked for all the time. Instead, what is meant to happen is basically everyday a new table_id from table_one is going to be picked and the user will search for them phyiscally and input 1 or Y, this has to occurs so that in a year all table_id are searched for physically. Note also, sometimes the user might not be able to get to all table_id picked for that day. Also, table_one techincally has up to 300,000 table_ids. These are just samples I included. My question though. How can this simple interface be implemented. I will appreciate any help. Thank you
Edited by: user13328581 on Aug 23, 2010 12:42 PM

Answer 1

I just noticed your table actually appears to use a combination of table_id and location_place as its primary key. Is this correct, does your primary key consist of these 2 columns, or is there a different column that by itself is the primary key? As is, my suggested solution won't work, but if you can tell me this, I can give you an example that will work.
If I assume you use both columns as your primary key, here are 2 options for you:
CREATE TABLE     table_three
(     table_id     VARCHAR2(40)     NOT NULL
,     location_place     VARCHAR2(100)     NOT NULL     
,     date_found     DATE
INSERT INTO     table_three
VALUES ('g1226', 'NEWYORK', SYSDATE-10);Then use the following query to populate your list of table_id/locations to check:
SELECT     t1.*
FROM     table_one t1
,     table_three t3
WHERE     t1.table_id          = t3.table_id (+)     -- (+) for outer join, since we want to include all values in table_one, whether or not there's a record for that value in table_three
AND     t1.location_place     = t3.location_place (+)
AND     (     t3.date_found     <= ADD_MONTHS(SYSDATE, -12)
     OR     t3.date_found     IS NULL
;(given the one record inserted in table_three, this query will return 5 records)
Or, if you want a record of when something was checked and whether it got a 'Y' or an 'N' (instead of the above, which assumes you only care if something is a 'Y'), you can use:
CREATE TABLE     table_four
(     table_id     VARCHAR2(40)     NOT NULL
,     location_place     VARCHAR2(100)     NOT NULL
,     date_checked     DATE
,     found_flag     CHAR(1)
INSERT INTO     table_four
VALUES ('g1226', 'NEWYORK', SYSDATE-10, 'Y');Then use the following query to populate your list of table_id/locations to check:
SELECT     t1.*
FROM     table_one     t1
WHERE     NOT EXISTS     (     
               SELECT     1
               FROM     table_four     t4
               WHERE     t4.table_id          = t1.table_id
               AND     t4.location_place     = t1.location_place
               AND     found_flag          = 'Y'
               AND     date_checked          > ADD_MONTHS(SYSDATE, -12)
;And, if you do have multiple people checking these items, John's suggestion is really good.