diff --git a/sql/upgrade.sql b/sql/upgrade.sql
deleted file mode 100644
index 8026b6676..000000000
--- a/sql/upgrade.sql
+++ /dev/null
@@ -1,18 +0,0 @@
-CREATE OR REPLACE FUNCTION comptaproc.letter_compare(p_jl bigint)
-  RETURNS numeric AS
-$BODY$
-declare
- nCred numeric(20,4);
- nDeb numeric(20,4);
-begin
-	if p_jl = -1 then
-		return 0.0;
-	end if;
-	select coalesce(sum(j_montant),0) into nCred from letter_cred join jrnx using (j_id) where jl_id=p_jl;
-	select coalesce(sum(j_montant),0) into nDeb from letter_deb join jrnx using (j_id) where jl_id=p_jl;
-
-
-	return nDeb-nCred;
-end;
-$BODY$
-  LANGUAGE plpgsql;
\ No newline at end of file