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(nvl(SELECT sum(wbs.days * 8 + wbs.hours) FROM com.vtradex.er.server.model.er.ProjectWbs wbs WHERE wbs.project.id=erp.id AND wbs.user.id= 248 ),0)
@Formula创建将执行此查询并通过注释将其映射到某些属性的存储过程会更容易。
@Formula