在插入语句中使用别名

Question

我是大多数时间使用ORM的SQL新手。我有以下查询别名麻烦：

command.CommandText = @" 
    INSERT INTO permissions (userid, remoteid) 
     SELECT userid as uid, :remoteid as rid 
     FROM users 
     WHERE companyid = :companyid 
      AND NOT EXISTS (
       SELECT 1 
       FROM permissions 
       WHERE userid = uid 
       AND remoteid = rid 
      )"; 

command.Parameters.AddWithValue("companyid", companyId); 
command.Parameters.AddWithValue("remoteid", resourceId); 

当查询执行时，我得到以下错误：

ERROR: 42703: column "uid" does not exist 

我在做什么错？别名是否应该像这样使用，并可以在INSERT声明中使用？

Answer 1

这个怎么样：

command.CommandText = @" 
    INSERT INTO permissions (userid, remoteid) 
     SELECT userid, :remoteid as rid 
     FROM users uid 
     WHERE companyid = :companyid 
      AND NOT EXISTS (
       SELECT 1 
       FROM permissions 
       WHERE userid = uid.userid 
       AND remoteid = rid 
      )"; 

command.Parameters.AddWithValue("companyid", companyId); 
command.Parameters.AddWithValue("remoteid", resourceId);