? Best way to determine if DB records already exist?

In my proggie, data is imported from a delimited text file to a grid. The primary identifier of each entry is the date; for example, 08/10/2000 as rs.fields(1).

When the imported text is saved to the database, I need to determine if the dates already exist so that the newer data does not create duplicates. Is there a better way than:

 
sSQL = "SELECT ACDDate FROM " & sRS & " WHERE [ACDDate] BETWEEN '08/01/2000' AND '08/30/2000'"

And then testing whether the RS is empty or contains recordsets?

Thanks!

[JHausmann]

1) Access will want your dates delimited by "#"
2) when checking for the existience of keys, you want to check at the level of uniqueness; ie; you'd want to look for a single date instead of a range.

for Access you'd want to use:
sSQL = "SELECT ACDDate FROM " & sRS & " WHERE [ACDDate] = #08/06/2000#"

for SQL server you'd want to use:

sSQL = "SELECT ACDDate FROM " & sRS & " WHERE ACDDate = '08/06/2000'"