Question

I am working with MySQL version 5. I have two tables structured as shown below.

Table1

From     To     Time     TravelTime

Table2

From    To      Time     CongestionTime

I would like to achieve the following output.

If From, To and Time are equal in both the tables, then assign TravelTime = CongestionTime

Table2 contains only a subset of the From | To | Time combinations available in Table1.

Answer 1

From is mysql reserved word. If you don’t want to escape it, change column names “From” to “TimeFrom”.

UPDATE table1,table2
SET table1.TravelTime=table2.CongestionTime
WHERE table1.From = table2.From
AND table1.To = table2.To