在插入語句中使用別名

Question

我是大多數時間都使用ORM的SQL新手。 我在以下查詢中遇到別名麻煩：

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);

查詢執行時，出現以下錯誤：

ERROR: 42703: column "uid" does not exist

我究竟做錯了什么？ 是否應該這樣使用別名，並且可以在INSERT語句中使用它們嗎？

Answer 1

這個怎么樣：

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);