Update Query Using Subquery in SQL Server

Update query using Subquery in Sql Server

you can join both tables even on UPDATE statements,

UPDATE  a
SET     a.marks = b.marks
FROM    tempDataView a
        INNER JOIN tempData b
            ON a.Name = b.Name

• SQLFiddle Demo

for faster performance, define an INDEX on column marks on both tables.

using SUBQUERY

UPDATE  tempDataView 
SET     marks = 
        (
          SELECT marks 
          FROM tempData b 
          WHERE tempDataView.Name = b.Name
        )

• SQLFiddle Demo

subqueries in UPDATE SET (sql server 2005)

You can try something like

UPDATE  trips
SET     locations = t.city + ', ' + poi.city
FROM    trips t INNER JOIN
        (
            select Distinct city, trip_guid from poi
        ) poi ON t.trip_guid = poi.trip_guid

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