[英]Sub-Query in linq
在linq中編寫此查詢的最佳方法是什么?
SELECT *
FROM product_master
where product_id in (select product_id from product where buyer_user_id=12)
var _result = from a in product_master
where (product.Where(s => s.buyer_user_id == 12))
.Contains(a.product_ID)
select a;
要么
var _result = (from a in product_master
join b in product
on a.product_id equals b.product_id
where b.buyer_user_id == 12
select a).Distinct();
JW的答案是對的。 或者,如果子查詢不相關,則可以單獨表達:
var pids = product.Where(p => p.buyer_user_id == 12);
var r = product_master.Where(pm => pids.Contains(pm.product_id));
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