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All the tables have an extra row called checksum which is stored by doing INSERT INTO example_table VALUES ('a','b', BINARY_CHECKSUM('a','b')).

Suppose someone change a row value, obviously the checksum will change, and when I run Select CHECKSUM_AGG(*) FROM example_table, that value will differ from the stored checksum. How can I detect, looping through all tables, what row or table was changed? Can I do this with a Stored Procedure? This is an SQL SERVER database.

  • Audit all tables and detect data changes. That's sort of the point of the question. – user107162 Oct 2 '16 at 17:41
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    There's a built-in functionality for auditing. – vonPryz Oct 2 '16 at 18:14
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select * 
from table 
where BINARY_CHECKSUM('a','b') <> checksumCol 

But if they can change a or b they can change the checksumCol

| improve this answer | |
  • I know it´s not a very good idea to store the checksum, but how can I determine that the new value differs from the actual value? – user107162 Oct 2 '16 at 17:24
  • Use timestamp or just don't give them update authority – paparazzo Oct 2 '16 at 17:25

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