Milli-second Update Issue....

Mar 26, 2007

Hello:

I have a testing table table_1 with Key1 int as PK and dateField datetime default getutcdate as Alternative key

select * from Table_1
key1 dateField
----- -----------------------
1 2007-03-26 21:13:53.163
2 2007-03-26 21:13:56.913
3 2007-03-26 21:14:04.117
4 2007-03-26 21:14:05.320
5 2007-03-26 21:14:08.193
6 2007-03-26 21:14:08.647
7 2007-03-26 21:14:09.397
(7 row(s) affected)
--testing if the millsecond are part of the unique key
update Table_1 set dateField = '2007-03-26 21:14:08.194' where key1 = 6

Msg 2601, Level 14, State 1, Line 1
Cannot insert duplicate key row in object 'dbo.Table_1' with unique index 'AK1_Table_1'.
The statement has been terminated.

I think 2007-03-26 21:14:08.194 is a new value and is unique within the range of field. Why it is accepted at the insertion time while reject updating later?

This verifies that:
1. datatime field could be accurated to milli-second
2. Guess there is a milli-second rounging issue.... thus could not be accurated to milli-second sometimes?

thanks
David

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SQL Server 2012 :: Update Statement Will Not Update Data Beyond 7 Million Plus Rows Out Of 38 Millions Rows

Dec 12, 2014

I run the following statement and it will not update beyond 7 million plus rows and I have about 38 million to complete. I keep checking updated row counts and after 1/2 day it's still the same so I know something is wrong because it was rolling through no problem when I initiated it. I need to complete ASAP so it's adding to my frustration. The 'Acct_Num_CH' field is an encrypted field (fyi).

SET rowcount 10000
UPDATE [dbo].[CC_Info_T]
SET [Acct_Num_CH] = 'ayIWt6C8sgimC6t61EJ9d8BB3+bfIZ8v'
WHERE [Acct_Num_CH] IS NOT NULL
WHILE @@ROWCOUNT > 0
BEGIN
SET rowcount 10000
UPDATE [dbo].[CC_Info_T]
SET [Acct_Num_CH] = 'ayIWt6C8sgimC6t61EJ9d8BB3+bfIZ8v'
WHERE [Acct_Num_CH] IS NOT NULL
END
SET rowcount 0

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