c# - 实体框架上的 SQL 查询

Question

如何对实体框架执行此 sql 查询？

select 
id,
column1,
column2 =  case when (select max(column2) from table1 b where b.id = a.id) = a.column2 
then 'Positive' else 'Negative' end
from table1 a

Answer 1

var query = from t in context.table1
            let column2_temp = context.table1.Where(p=>p.id==t.id).Max(p=>p.column2)
            let column2 = column2_temp == t.column2? "Positive" : "Negative"
            select new {t.id, column2}