DE-12 in my preview

[demusniko12]

i used case when for 3 of my fields but when the field shoud've been null, they printed DE-12 from nowhere.

my query 

select
CAST(a.vdate as date) as end_day,
case when a.ccy = 'USD' and a.ctrccy = 'JPY' then sum(A.ccyamt*A.CCYRATE_8) else 0 end as usdjpy,
case when a.ccy = 'USD' and a.ctrccy = 'SGD' then sum(A.ccyamt*A.CCYRATE_8) else 0 end as usdsgd,
case when a.ccy = 'AUD' and a.ctrccy = 'USD' then sum(A.ccyamt*A.CCYRATE_8) else 0 end as audusd,
case when a.ccy = 'USD' and a.ctrccy = 'IDR' then sum(A.ccyamt*A.CCYRATE_8) else 0 end as usdidr,
COUNT(a.PRODCODE) as jumlah_transaksi

FROM FXDH A
LEFT JOIN CUST B ON A.CUST=B.CNO
LEFT JOIN BROK C ON A.BROK=C.BROKNO
LEFT JOIN TRAD D ON A.TRAD=D.TRAD
LEFT JOIN VW_SRHR E ON A.DEALDATE=E.TANGGAL AND A.CCY=E.CCY AND A.BR=E.BR

group by 
a.CCY,a.CTRCCY,CAST(a.vdate as date)
ORDER BY end_day

the previewed

[gustavofarias]

isn't it 0e-12? Meaning 0 with exponent -12. This is just E notation for a Exponentiation