在OUTER JOIN Sqlite下计数

Question

SELECT 
    Ticket_No,
    _id,
    Date_Add,
    trip_no,
    f.Location_Name AS FromName,
    From_LocationID,
    To_LocationID,
    t.Location_Name AS ToName
FROM Tbl_InOut
LEFT JOIN Tbl_Ticket
    ON Tbl_InOut._id = Tbl_Ticket.Trip_ID
LEFT JOIN Tbl_Location AS f
    ON f.Location_ID = Tbl_Ticket.From_LocationID
LEFT JOIN Tbl_Location AS t
    ON t.Location_ID = Tbl_Ticket.To_LocationID

UNION ALL

SELECT Ticket_No,
    _id,
    Date_Add,
    trip_no,
    f.Location_Name AS FromName,
    From_LocationID,
    To_LocationID,
    t.Location_Name AS ToName
FROM Tbl_Ticket
LEFT JOIN Tbl_InOut
    ON Tbl_InOut._id = Tbl_Ticket.Trip_ID
LEFT JOIN Tbl_Location AS f
    ON f.Location_ID = Tbl_Ticket.From_LocationID
LEFT JOIN Tbl_Location AS t
    ON t.Location_ID = Tbl_Ticket.To_LocationID

首先是Tbl_InOut左加入Tbl_Ticket和 Tbl_Location LEFT JOIN与Tbl_Ticket这是结果，现在我想计算从From_LocationID到To_Location的数据量

示例Ticket_No 1,2,3,4,5是from_LocationID 1 to To_LocationID 3 total是5所以在To_Name列旁边将添加一个列名TotalCount，而TotalCount列值下的这5行是5，少了我不解释请看上面的图片我添加了totalCount列与我想要的值

修改

1计数器工作正常但是，2计数数据将变为双倍，如何解决，这是我的SQL

SELECT
       Ticket_No,_id,Date_Add, trip_no,f.Location_Name as FromName,From_LocationID,To_LocationID,t.Location_Name as ToName,PriceType_ID,Amount,
       (SELECT COUNT(*) FROM Tbl_Ticket WHERE Trip_ID = Tbl_InOut._id AND Tbl_Ticket.From_LocationID = f.Location_ID AND t.Location_ID = Tbl_Ticket.To_LocationID AND Tbl_Ticket.PriceType_ID = 0) AS NormalCount,
       (SELECT COUNT(*) FROM Tbl_Ticket WHERE Trip_ID = Tbl_InOut._id AND Tbl_Ticket.From_LocationID = f.Location_ID AND t.Location_ID = Tbl_Ticket.To_LocationID AND Tbl_Ticket.PriceType_ID > 0) AS DiscountCount

FROM   Tbl_InOut
        LEFT JOIN Tbl_Ticket ON Tbl_InOut._id = Tbl_Ticket.Trip_ID
        LEFT JOIN Tbl_Location as f On f.Location_ID = Tbl_Ticket.From_LocationID
        LEFT JOIN Tbl_Location as t On t.Location_ID = Tbl_Ticket.To_LocationID
UNION ALL
SELECT
       Ticket_No,_id,Date_Add, trip_no,f.Location_Name as FromName,From_LocationID,To_LocationID,t.Location_Name as ToName ,PriceType_ID,Amount,
      (SELECT COUNT(*) FROM Tbl_Ticket WHERE Trip_ID = Tbl_InOut._id AND Tbl_Ticket.From_LocationID = f.Location_ID AND t.Location_ID = Tbl_Ticket.To_LocationID AND Tbl_Ticket.PriceType_ID = 0) AS NormalCount,
       (SELECT COUNT(*) FROM Tbl_Ticket WHERE Trip_ID = Tbl_InOut._id AND Tbl_Ticket.From_LocationID = f.Location_ID AND t.Location_ID = Tbl_Ticket.To_LocationID AND Tbl_Ticket.PriceType_ID > 0) AS DiscountCount
FROM   Tbl_Ticket
        LEFT JOIN Tbl_InOut  ON Tbl_InOut._id = Tbl_Ticket.Trip_ID
        LEFT JOIN Tbl_Location as f On f.Location_ID = Tbl_Ticket.From_LocationID
        LEFT JOIN Tbl_Location as t On t.Location_ID = Tbl_Ticket.To_LocationID

Answer 1

您可以使用相关子查询来计算匹配的记录数：

SELECT
    ...,
    (SELECT COUNT(*)
     FROM Tbl_Ticket
     WHERE Trip_ID = Tbl_InOut._id
    ) AS TotalCount
FROM ...