[英]How to use left outer join in LINQ for SQL query?
如何在LINQ中使用左外部聯接進行以下SQL查詢?
SELECT a.EventID, a.PrizeId, b.PrizeName, b.PrizeValue, c.FightID, c.Winnerid, c.WinnerName
FROM tblUserprize a
JOIN tblPrizeDetails b
ON a.PrizeId=b.PrizeId
LEFT OUTER JOIN tblWinnersList c
ON a.EventID=c.EventID AND a.PrizeId=c.PrizeId AND c.FightID = 1534
WHERE a.EventID = 1320
它看起來應該像這樣:
var userPrize = (
from a in tblUserprize
join b in tblPrizeDetails on a.PrizeId equals b.PrizeId
join c in tblWinnersList on new { a.EventID, a.PrizeId } equals new { c.EventID, c.PrizeId } into joinedTables
from item in joinedTables.DefaultIfEmpty()
where a.EventID == 1320 && item.FightID == 1534
select new
{
a.EventID,
a.PrizeId,
b.PrizeName,
b.PrizeValue,
item.FightID,
item.Winnerid,
item.WinnerName
});
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