SQL SELECT statement in XSLT!

hi,

I have three tables:ACCOUNTS, WACCTS and CURRENCIES...
In ACCOUNTS i have a field CURR_CODE
and
In WACCTS i have a field CURR_ISO

i want to write this select statement in XSLT:

"Select CURR_ISO from CURRENCIES where CURR_CODE(in ACCOUNTS)=CURR_CODE(in 
CURRENCIES)"
i am using the ACCOUNTS table as the xml input to the saxon...
Do i have to merge ACCOUNTS and CURRENCIES XML documents and use them as the 
input or what???
Thanks in advance...

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