Missing Values Clarification

Regarding Missing values for 3 attriubutes that you mentioned yesterday
I've worked on those and found that these values are not exist in database that is why those not showing
COrrect aobve

Sure! Here's the corrected version of your message with improved grammar and clarity:

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Regarding the missing values for the 3 attributes you mentioned yesterday,
I've looked into it and found that these values do not exist in the database, which is why they are not showing.

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Let me know if you want it to sound more formal or casual!