left join ffs_publicelement d on d.code=isnull(b.project_type,k.project_type) and d.type=‘project_type‘
left join FFS_PAYMENT e on e.projectapplyid=a.guid
left join FFS_PAYMENTDETAIL f on f.projectapplyid=a.guid
left join IFS_USER g on g.guid=f.payopuser
left join IFS_USER h on h.guid=a.saler_id
left join FFS_CustomerRefsaler i on i.customer_id=isnull(b.customerid,k.customerid) and i.recordstatus=‘A‘
left join ffs_publicelement j on j.code=a.recordstatus and j.type=‘ProjectApply_Status‘
where isnull(b.project_date,k.project_date) between ‘2017-01-25‘ and ‘2017-04-26‘ --and b.project_type in(‘001‘,‘002‘,‘003‘,‘004‘,‘005‘)
and a.recordstatus=‘Payed‘ and isnull(b.recordstatus,k.recordstatus)=‘Approved‘
蓝色标记 处中，利用是isnull（）方法巧妙的进行选择on的条件；
红色标记处中，该段sql语句是写在C#后台中，利用"--"来进行注释
C#后台sql语句注释，根据isnull()方法进行条件选择
标签：isnull end 红色 amt ase detail yam 利用 use