Negative Testing a Database :
As the normal meaning of the negative testing is to give some input which is not appropriate(wrong input) to test whether the system shoots out the warning or not. Same way while you are testing the database you you need to have sample data( which is already stored in database)
Ex: username and password for a login screen
when you try to give a username and password which are not valid and relavent then the system has to check with the values that are stored and has to show a mismatch.
If it shoots out or pops up or displays a message of this irrelavence occurance then we can be sure that the system is passing in negative test.
Qulaity Audit
Quality audit is normally conducted by QA people to find out the level to which the standards have been attained. Depending on this result the analysis of the quality that is followed to develop a process can be calculated. I always keep it like this All the rivers have humble begning so is the case with the quality. It may not look like the serious thing in the beggining but by the end it will have a great impact on the outcome. so internal quality auditing is necessary to keep track of the quality process attained.