>Hello,
>
>I have a table with some fields including LNAME and FNAME (Lastname/Firstname).
>One index on LNAME+FNAME
>
>I want to make several requests :
>- only lnames beginning with... (SELECT * FROM t1 WHERE LNAME="A")
>- both lnames and fnames begining with..(SELECT * FROM t1 WHERE LNAME="A" AND FNAME="B")
>

For your second query, you could use something like:

WHERE LNAME+FNAME = PADR("A", LEN(LNAME)) + "B"

Tamar