單一條件查詢：
var table2Object = (from t1 in db.table1 join t2 in db.table2 on t1.id equals t2.id select t2).FirstOrDefault();
復合條件 查詢：
多個主鍵 聯合查詢
var table2Object = (from t1 in db.table1 join t2 in db.table2 on new { t1.id, t1.another_id } equals new { t2.id, t2.another_id } select t2).FirstOrDefault();
多表聯合查詢：
Join3個Table
var table2Object = (from t1 in db.table1 join t2 in db.table2 on new { t1.id, t1.another_id } equals new { t2.id, t2.another_id } join t3 in db.table3 on new { t2.id, t2.another_id } equals new { t3.id, t3.another_id } select t2).FirstOrDefault();
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疑難解答
