dbf select distinct sql using VB

can you help me how to join 2 tables and select distinct items the other database is dbf the other is an sql file thanks :)
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Do you have any other details to share?
table names?
database names?
how the tables join?
what columns need to be distinct?

Do you have any queries working across these 2 data sources currently?

Right now I don't believe this question can be answered.

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kennethzxcAuthor Commented:
it's an attendance so the dbf is passing data to the vb and i query in the vb about the dbf and pass the value to sql server .
so i just want to pass the values that are inputed in the dbf where curddate or the date and time now - 20000 secs :D it's dynamic and its running on a service thanks :D
i'll post the query tom
it's like

VB.DBF query = Select empno,logtime where datetime = current date and time - 20000 secs ? i don't know how to query it :D
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