c# - 将带有子查询的 sql 查询转换为 linq 语句

Question

可能重复：
如何在 LINQ 中进行子查询

我有一个 SQL Server 2008 查询：

select 
    account_hcc_id, account_name 
from 
    [ACCOUNT_HISTORY_FACT] 
where 
     TOP_ACCOUNT_KEY = (select TOP 1 TOP_ACCOUNT_KEY 
                        from ACCOUNT_HISTORY_FACT 
                        where account_hcc_id = '3362') 
     and ACCOUNT_LEVEL = 1;

我需要将其转换为 C# linq 语句。请让我知道我该怎么做。

Answer 1

from ahf in db.ACCOUNT_HISTORY_FACT
where ahf.ACCOUNT_LEVEL == 1 &&
      ahf.TOP_ACCOUNT_KEY == db.ACCOUNT_HISTORY_FACT
                               .Where(x => x.account_hcc_id == "3362") 
                               .Select(x => x.TOP_ACCOUNT_KEY)
                               .FirstOrDefault() 
select new { ahf.account_hcc_id, ahf.account_name };