I have a background in Mathmatics

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I have a background in Mathmatics

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X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 12:43:14

Trying to reconcile 2 different data sources. I was told that if I sum up an IDENTITY Column, Count the Rows, and take the MAX and MIN dates, and if these results from 2 different systems are the same, that it would prove the data is the same.

And I said: "NO WAY"

They said: "I have a background in mathematics, and I can ASSURE you that is indeed true, AND I can Prove it"

There may be a high likelyhood, but not absolute.

They never said degree btw....in any case..any ideas that would really prove to sets of data in 2 tables in 2 different environments are the same?



CREATE TABLE #myActions_myMessage (
	[Group_Trans_Id] [int],
	[Term_DT] [date] NULL,
	[Add_TS] [datetime] NOT NULL,
	[Upd_TS] [datetime] NOT NULL
)
GO

CREATE TABLE #GETS_myMessage (
	[Group_Trans_Id] [int],
	[Term_DT] [date] NULL,
	[Add_TS] [datetime] NOT NULL,
	[Upd_TS] [datetime] NOT NULL
)
GO

INSERT INTO #myActions_myMessage ([Group_Trans_Id], [Term_DT], [Add_TS], [Upd_TS])
SELECT 10, '09/11/2001', '1/1/2001', '2/1/2001' UNION ALL
SELECT 20,  null,		 '3/1/2012', '3/2/2011' UNION ALL
SELECT 30, '09/11/2012', '3/2/2012', '3/3/2011' UNION ALL
SELECT 40, '03/17/2012', '3/3/2011', '3/4/2011' UNION ALL
SELECT 50, '12/31/9999', '3/4/2011', '3/5/2011'

  SELECT  COUNT(*)						AS COUNT_myMessage_Active
		, SUM(Group_Trans_ID)			AS SUM_Group_TRANS_ID_Active	
		, MAX(Term_Dt)					AS MAX_Term_Dt	
		, MIN(Term_Dt)					AS MIN_Term_Dt	
		, MAX(Add_TS)					AS MAX_Add_TS_Active
		, MAX(Upd_TS)					AS MAX_Upd_TS_Active
    FROM  #myActions_myMessage 
   WHERE COALESCE(Term_Dt,'12/31/9999') > CONVERT(varchar(10),GETDATE(),1)

INSERT INTO #GETS_myMessage ([Group_Trans_Id], [Term_DT], [Add_TS], [Upd_TS])
SELECT 10, '09/11/2001', '1/1/2001', '2/1/2001' UNION ALL
SELECT 15, '03/17/2012', '3/1/2012', '3/2/2011' UNION ALL
SELECT 30, '09/11/2012', '3/2/2012', '3/3/2011' UNION ALL
SELECT 45, '05/17/2012', '3/3/2011', '3/5/2011' UNION ALL
SELECT 50, '12/31/9999', '3/4/2011', '3/5/2011'


  SELECT  COUNT(*)						AS COUNT_myMessage_Active
		, SUM(Group_Trans_ID)			AS SUM_Group_TRANS_ID_Active	
		, MAX(Term_Dt)					AS MAX_Term_Dt	
		, MIN(Term_Dt)					AS MIN_Term_Dt	
		, MAX(Add_TS)					AS MAX_Add_TS_Active
		, MAX(Upd_TS)					AS MAX_Upd_TS_Active
    FROM  #GETS_myMessage 
   WHERE COALESCE(Term_Dt,'12/31/9999') > CONVERT(varchar(10),GETDATE(),1)
   
GO

DROP TABLE #myActions_myMessage, #GETS_myMessage
GO

/*
COUNT_myMessage_Active SUM_Group_TRANS_ID_Active MAX_Term_Dt MIN_Term_Dt MAX_Add_TS_Active       MAX_Upd_TS_Active
---------------------- ------------------------- ----------- ----------- ----------------------- -----------------------

4                      140                       9999-12-31  2012-03-17  2012-03-02 00:00:00.000 2011-03-05 00:00:00.000

COUNT_myMessage_Active SUM_Group_TRANS_ID_Active MAX_Term_Dt MIN_Term_Dt MAX_Add_TS_Active       MAX_Upd_TS_Active
---------------------- ------------------------- ----------- ----------- ----------------------- -----------------------
4                      140                       9999-12-31  2012-03-17  2012-03-02 00:00:00.000 2011-03-05 00:00:00.000


*/

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Want to help yourself?

http://msdn.microsoft.com/en-us/library/ms130214.aspx

http://weblogs.sqlteam.com/brettk/

http://brettkaiser.blogspot.com/

robvolk
Most Valuable Yak

15732 Posts

Posted - 2012-03-08 : 13:27:37

quote:
Originally posted by X002548

Trying to reconcile 2 different data sources. I was told that if I sum up an IDENTITY Column, Count the Rows, and take the MAX and MIN dates, and if these results from 2 different systems are the same, that it would prove the data is the same.

And I said: "NO WAY"

They said: "I have a background in mathematics, and I can ASSURE you that is indeed true, AND I can Prove it"

There may be a high likelyhood, but not absolute.

Please:

create table #a(i int not null identity(0,4), dt datetime)
create table #b(i int not null identity(1,2), dt datetime)

insert #a(dt) values(GETDATE())
insert #a(dt) values(GETDATE()-1)

insert #b(dt) values(GETDATE()-1)
insert #b(dt) values(GETDATE())

-- "identical" data according to moron:
select COUNT(*) row, SUM(i) sum_identity, MAX(dt) max_dt, MIN(dt) min_dt from #a
select COUNT(*) row, SUM(i) sum_identity, MAX(dt) max_dt, MIN(dt) min_dt from #b

-- proof it's not identical
select 'intersect 2', * from #a intersect select 'intersect', * from #b  -- 2 rows if identical
select 'union 2', * from #a union select 'union 2', * from #b  -- ONLY 2 rows if identical
select 'except 0', * from #a except select 'except 0', * from #b  -- no rows if identical
select 'except 0', * from #b except select 'except 0', * from #a  -- no rows if identical

drop table #a,#b

2 columns + 2 rows = 100% disproved. I'm not sure you can come up with a smaller example, and it's easy to add a third column and/or row that really kills it. I didn't even cheat like you did, I used actual identity columns.

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2012-03-08 : 13:29:50

Well you can prove that the count is the same, but that doesn't mean the other columns have the same data. A simple example can show that. Additionally, you could SUM the IDs and get the same VALUE, but that doesn't mean all the IDs are the same either. Doesn't seem like much of a discussion to me.

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 13:42:27

why do you think I was floored...and when they pull out...I have a background...I'm like...get your waders on

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Want to help yourself?

http://msdn.microsoft.com/en-us/library/ms130214.aspx

http://weblogs.sqlteam.com/brettk/

http://brettkaiser.blogspot.com/

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 13:48:44

Well, Rob, assume I am giving the other source the values of the identity. It just in an OLTP Environment, IF they lose stuff (and it appears their process is not the best), THEN the sum() could have different numbers (deleted, inserts) is my point

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Want to help yourself?

http://msdn.microsoft.com/en-us/library/ms130214.aspx

http://weblogs.sqlteam.com/brettk/

http://brettkaiser.blogspot.com/

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 14:06:38

my real question is, when will they just start to take my word for it...30 years in this damn b'dness...

-- Rodney D

robvolk
Most Valuable Yak

15732 Posts

Posted - 2012-03-08 : 14:38:05

quote:
why do you think I was floored...and when they pull out...I have a background...I'm like...get your waders on

I'm pretty sure their "background in mathematics" consists of a picture of "E=mc2" or a square root sign or a college math blackboard on their computer desktop. I was pretty sure the misspelling of "Mathematics" in the title was theirs, not yours.

So how did you keep from strangling them? (If you did, that is)

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 15:01:13

"thanks for the clarification on this. I was only anticipating errors on the client side and should have considered both.

And

"Thank you Brett.

...Brett is right. Approach that "mostly" works is not sufficient."

And then...maybe this can be used to "Hash" (cough, cough) the Data

Do we have a WTF Forum?



with temp_hash ( hash_num )
AS
(
SELECT 	
	  CASE 	WHEN (  SELECT tran_val1 
			FROM DB2SCHEMA.npt_hash_table_r ht
			WHERE SUBSTR(co.contr_id, 1, 1 ) = ht.char_value ) <  128
		THEN	
			CAST(((((SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 1, 1 ) = ht.char_value )
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 2, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 3, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 4, 1 ) = ht.char_value )) AS BIGINT)
                ELSE
                        CAST(((((SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 1, 1 ) = ht.char_value )
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 2, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 3, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 4, 1 ) = ht.char_value ))
                        + 1 AS BIGINT)
	  END
	+ CASE 	WHEN ( SELECT tran_val1 
			FROM DB2SCHEMA.npt_hash_table_r ht
			WHERE SUBSTR(co.contr_id, 5, 1 ) = ht.char_value ) <  128
		THEN	
			CAST(((((SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 5, 1 ) = ht.char_value )
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 6, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 7, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 8, 1 ) = ht.char_value )) AS BIGINT)
                ELSE
                        CAST(((((SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 5, 1 ) = ht.char_value )
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 6, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 7, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 8, 1 ) = ht.char_value ))
                        + 1 AS BIGINT)
	  END
	+ CASE 	WHEN ( SELECT tran_val1 
			FROM DB2SCHEMA.npt_hash_table_r ht
			WHERE SUBSTR(co.contr_id, 9, 1 ) = ht.char_value ) <  128
		THEN	
			CAST(((((SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 9, 1 ) = ht.char_value )
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 10, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 11, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 12, 1 ) = ht.char_value )) AS BIGINT)
                ELSE
                        CAST(((((SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 9, 1 ) = ht.char_value )
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 10, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 11, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 12, 1 ) = ht.char_value ))
                        + 1 AS BIGINT)
	  END
	+ CASE 	WHEN ( SELECT tran_val1 
			FROM DB2SCHEMA.npt_hash_table_r ht
			WHERE SUBSTR(co.contr_id, 13, 1 ) = ht.char_value ) <  128
		THEN	
			CAST(((((SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 13, 1 ) = ht.char_value )
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 14, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 15, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 16, 1 ) = ht.char_value )) AS BIGINT)
                ELSE
                        CAST(((((SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 13, 1 ) = ht.char_value )
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 14, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 15, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 16, 1 ) = ht.char_value ))
                        + 1 AS BIGINT)
	  END
	+ CASE 	WHEN ( SELECT tran_val1 
			FROM DB2SCHEMA.npt_hash_table_r ht
			WHERE SUBSTR(co.contr_id, 17, 1 ) = ht.char_value ) <  128
		THEN	
			CAST(((((SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 17, 1 ) = ht.char_value )
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 18, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 19, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 20, 1 ) = ht.char_value )) AS BIGINT)
                ELSE
                        CAST(((((SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 17, 1 ) = ht.char_value )
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 18, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 19, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 20, 1 ) = ht.char_value ))
                        + 1 AS BIGINT)
	  END
	+ CASE 	WHEN ( SELECT tran_val1 
			FROM DB2SCHEMA.npt_hash_table_r ht
			WHERE SUBSTR(co.contr_id, 21, 1 ) = ht.char_value ) <  128
		THEN	
			CAST(((((SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 21, 1 ) = ht.char_value )
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 22, 1 ) = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                          WHERE ' '  = ht.char_value ))
			* 256 + 
			(SELECT tran_val1
                        FROM DB2SCHEMA.npt_hash_table_r ht
                         WHERE ' '  = ht.char_value )) AS BIGINT)
                ELSE
                        CAST(((((SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 21, 1 ) = ht.char_value )
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                        WHERE SUBSTR(co.contr_id, 22, 1 ) = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                          WHERE ' ' = ht.char_value ))
                        * 256 +
                        (SELECT tran_val2
                        FROM DB2SCHEMA.npt_hash_table_r ht
                          WHERE ' ' = ht.char_value ))
                        + 1 AS BIGINT)
	END 
FROM      DB2SCHEMA.npt_contract	co
	
)


SELECT 'KT~TK '|| cast (sum(hash_num ) as char(20))
from temp_hash

;

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 15:03:12

based on the following..I wonder how often it blows up


\par \plain\f4\fs32\b TABLE : npt_hash_table_r \plain\f3\fs30\b 
\par 
\par 
\par \plain\f3\fs32\b STRUCTURE\plain\f3\fs30\b 
\par \plain\f3\fs20 
\par Column             Type        Type
\par name               schema      name               Length   Scale    Nulls
\par ------------------ ----------- ------------------ -------- -------- --------
\par CHAR_VALUE         SYSIBM      CHARACTER                 1        0 Yes  
\par ASCII_VAL          SYSIBM      INTEGER                   4        0 No   
\par TRAN_VAL1          SYSIBM      INTEGER                   4        0 Yes  
\par TRAN_VAL2          SYSIBM      INTEGER                   4        0 Yes  
\par 
\par \pard\plain\f2\fs20 
\par 
\par \plain\f2\fs32\b VALUES \plain\f2\fs20 
\par 
\par 
\par 
\par 
\par CHAR_VALUE ASCII_VAL   TRAN_VAL1   TRAN_VAL2  
\par ---------- ----------- ----------- -----------
\par                     32          64         191
\par !                   33          90         165
\par -                   34         127         128
\par #                   35         123         132
\par $                   36          91         164
\par %                   37         108         147
\par &                   38          80         175
\par '                   39         125         130
\par (                   40          77         178

robvolk
Most Valuable Yak

15732 Posts

Posted - 2012-03-08 : 15:27:09

quote:
And then...maybe this can be used to "Hash" (cough, cough) the Data

Do we have a WTF Forum?

...snipped ungodly fucking wrong query from quoted post...

This...person...who suggested this, do they write code generators for a living? They should. They absolutely SHOULD NOT be allowed to write SQL.

I've barfed on my keyboard and "written" better SQL while mopping it up. Do they know you can select more than one column from the same table in the same SELECT statement?

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 16:12:06

Thanks Rob...I could probably arrange an accident here in beautiful downtown Newark, NJ

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Want to help yourself?

http://msdn.microsoft.com/en-us/library/ms130214.aspx

http://weblogs.sqlteam.com/brettk/

http://brettkaiser.blogspot.com/

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-08 : 16:16:48

That's my building between University, Bank, Academy and Washington

I could hit it with a 5 iron

http://www.nj.com/news/index.ssf/2012/03/person_shot_injured_blocks_fro.html

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Want to help yourself?

http://msdn.microsoft.com/en-us/library/ms130214.aspx

http://weblogs.sqlteam.com/brettk/

http://brettkaiser.blogspot.com/

DonAtWork
Master Smack Fu Yak Hacker

2167 Posts

Posted - 2012-03-09 : 07:06:20

so, what.. are you showing us how you took care of this "problem"?

http://weblogs.sqlteam.com/jeffs/archive/2008/05/13/question-needed-not-answer.aspx
How to ask: http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx
For ultra basic questions, follow these links.
http://www.sql-tutorial.net/
http://www.firstsql.com/tutor.htm
http://www.w3schools.com/sql/default.asp

X002548
Not Just a Number

15586 Posts

Posted - 2012-03-09 : 09:31:01

just sayin....

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Want to help yourself?

http://msdn.microsoft.com/en-us/library/ms130214.aspx

http://weblogs.sqlteam.com/brettk/

http://brettkaiser.blogspot.com/

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