實體框架上的SQL查詢

Question

如何對實體框架執行此sql查詢？

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}