[sql]SELECT mf.uid
FROM cdb_student st, cdb_memberfields mf
WHERE st.used = '1'
AND st.xh = mf.field_1
AND st.xm = mf.field_2
AND st.sfz = mf.fi[......]
[sql]SELECT mf.uid
FROM cdb_student st, cdb_memberfields mf
WHERE st.used = '1'
AND st.xh = mf.field_1
AND st.xm = mf.field_2
AND st.sfz = mf.fi[......]