diff --git a/SQL/PLSQL.sql b/SQL/PLSQL.sql
new file mode 100644
index 0000000..7253299
--- /dev/null
+++ b/SQL/PLSQL.sql
@@ -0,0 +1,23 @@
+
+
+CREATE OR REPLACE FUNCTION mostValuableClerk(months IN NUMBER) RETURN NUMBER
+IS
+    startMonat DATE;
+BEGIN
+    startMonat := ADD_MONTHS(SYSDATE,-months);
+
+    SELECT MAX(Anzahl) FROM
+    (
+    SELECT DISTINCT CLERKID, COUNT(CLERKID) AS Anzahl
+        From
+        (
+        SELECT clcl.CLERKID
+         FROM CLEANINGCLERK clcl
+         INNER JOIN CLEANINGPLAN clpl ON clcl.CLEANINGPLANID = clpl.CLEANINGPLANID
+         WHERE clpl."date" >= startMonat
+         )
+    GROUP BY CLERKID
+    );
+
+    return null;
+END;
\ No newline at end of file
diff --git a/SQL/Schema.sql b/SQL/Schema.sql
index 40414ef..fd089db 100644
--- a/SQL/Schema.sql
+++ b/SQL/Schema.sql
@@ -97,4 +97,5 @@ CREATE TABLE BookingRoom (
     PRIMARY KEY(bookingId, roomNumber),
     FOREIGN KEY (bookingId) REFERENCES Booking(bookindId),
     FOREIGN KEY (roomNumber) REFERENCES Room(roomNumber)
-);
\ No newline at end of file
+);
+