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SELECT question

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gary.morey
gary.morey
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The SSN is stored as a hashed value.
gary.morey
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The SSN is stored as a MD5 hashed value.

The combination of SSN, PKT and FICE_NBR in table A does not have a match on the combination of SSN, PKT and FICE_NBR in table B.
ChrisM@Work
ChrisM@Work
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gary.morey (12/11/2013)
The SSN is stored as a MD5 hashed value.

The combination of SSN, PKT and FICE_NBR in table A does not have a match on the combination of SSN, PKT and FICE_NBR in table B.


You were probably expecting matches, Gary. Can you post the query you used?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
gary.morey
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SELECT *
FROM Temp_BigTable
WHERE SSN + PKT + FICE_NBR
NOT IN (
SELECT SSN + PKT + FICE_NBR
FROM shi.raw33
)
Jeff Moden
Jeff Moden
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gary.morey (12/11/2013)
The SSN is stored as a MD5 hashed value.

The combination of SSN, PKT and FICE_NBR in table A does not have a match on the combination of SSN, PKT and FICE_NBR in table B.


Ah, thanks, Gary. I feel much better now.

Shifting gears a bit, you might want to consider something a little bit more than simple MDF hashing. A simple billion row rainbow table (which is nothing on the machines today) would quickly unravel all of the SSNs. Even adding a salt to the MD5 would be better although that would likely still fail an audit.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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Luis Cazares
Luis Cazares
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gary.morey (12/11/2013)
SELECT *
FROM Temp_BigTable
WHERE SSN + PKT + FICE_NBR
NOT IN (
SELECT SSN + PKT + FICE_NBR
FROM shi.raw33
)

I recommend you to read the following article NOT EXISTS vs NOT IN


Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?


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