2013-10-03 231 views

回答

3

給子查詢別名:

select * 
from ( 
    Select DISTINCT status From MNPdata where IMSI_no = 'abc' 
) AS t 

由於子查詢只選擇status,你可以這樣做,而不是:

Select DISTINCT status From MNPdata where IMSI_no = 'abc' 
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