|
Please see my comments inline below:
1) COMMON_FILE is empty when you start -----YES
2) ITEM values are unique in FILE_A -----YES
Then I think all the records in FILE_A should be inserted into
COMMON_FILE. Does this happen? -----YES it does
How are you proving "The exists is not working and as a result the insert
is inserting duplicates"? Are you sure you are doing this correctly?
--------Before doing the next insert, I list all duplicates. There are
none. After running the INSERT, I run the duplicates check and there now
are duplicates.
You can check for duplicate ITEMS simply with something like this:
SELECT ITEM,COUNT(*)
FROM COMMON_FILE
GROUP BY ITEM
HAVING COUNT(*) > 1
---- This is already being done.
On Thu, Oct 23, 2014 at 9:57 PM, Sam_L <lennon_s_j@xxxxxxxxxxx> wrote:
So, given:
1) COMMON_FILE is empty when you start
2) ITEM values are unique in FILE_A
Then I think all the records in FILE_A should be inserted into
COMMON_FILE. Does this happen?
How are you proving "The exists is not working and as a result the insert
is inserting duplicates"? Are you sure you are doing this correctly?
You can check for duplicate ITEMS simply with something like this:
SELECT ITEM,COUNT(*)
FROM COMMON_FILE
GROUP BY ITEM
HAVING COUNT(*) > 1
Sam
On 10/23/2014 10:56 AM, Darryl Freinkel wrote:
I need some help on this one.---
I am merging 5 company records into 1 file and need to drop any
duplicates.
This is the statement:
INSERT INTO COMMON_FILE
(SELECT * FROM FILE_A A1
WHERE NOT EXISTS (SELECT 1 FROM COMMON_FILE A2 WHERE A1.ITEM = A2.ITEM))
Problem:
The exists is not working and as a result the insert is inserting
duplicates.
What alternative ways are there to achieve this merge or what mistake am I
not seeing?
I have 5 similar SQL statements to run.
TIA
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