根据两个表值合并 SQL 表中的行

Question

I have a table with travel details. Details are getting saved in distributed manner. I need to merge the rows based on Source and Destination. My Source is A and Final Destination is D, I need to merge all the 3 rows into 1 with sum of time and distance, based on date of travel.

Table Details and Expected Output

I tried using Concatenate but not able to do based on conditions. Not sure how to combine rows of one table based on values of another.

Answer 1

You can use LEFT JOIN statement and then aggregate:

SELECT Table2.Date,
       Table2.CarID,
       Table2.Source,
       Table2.Destination,
       SUM(Table1.Distance) AS Distance,
       SUM(Table1.[Time(Hours)]) AS [Time(Hours)]
FROM Table2
LEFT JOIN Table1
     ON  (Table1.Source BETWEEN Table2.Source AND Table2.Destination
     OR  Table1.Destination BETWEEN Table2.Source AND Table2.Destination)
     AND Table2.Date = Table1.Date
     AND Table2.CarID = Table1.CarID
GROUP BY Table2.Date,
         Table2.CarID,
         Table2.Source,
         Table2.Destination

This assumes that your Source and Destination never overlap - like in the example you provided.