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sql SUM:用0更改null

我有这样的查询:

SELECT bgdepartemen.c_kodedept AS c_kodedept,
       bgdepartemen.vc_namadept AS vc_namadept,
       bgdivisi.c_kodediv AS c_kodediv,
       bgdivisi.vc_namadiv AS vc_namadiv,
       bggroup0.c_kodegrp0 AS c_kodegrp0,
       bggroup0.vc_namagrp0 AS vc_namagrp0,
       (SELECT COALESCE(SUM(bgbudget0.n_nilai))
        FROM (bgbudget0 JOIN bggroup1 ON bgbudget0.c_kodegrp1 = bggroup1.c_kodegrp1)
        WHERE bgbudget0.n_tahun = 2016 AND
              bgbudget0.n_bulan >= 2 AND
              bgbudget0.n_bulan <= 3 AND
              bgbudget0.c_kodediv = bgdivisi.c_kodediv AND
              bggroup1.c_kodegrp0 = bggroup0.c_kodegrp0 AND
              bggroup1.c_kodegrp1 LIKE '%') AS nilai
FROM bgdivisi JOIN bggroup0 ON 1 = 1
JOIN bgdepartemen on bgdivisi.c_kodedept = bgdepartemen.c_kodedept
WHERE bgdivisi.c_kodediv LIKE '%' AND
     bgdepartemen.c_kodedept LIKE '%' AND
     bggroup0.c_kodegrp0 …
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