Check two columns and update other table

Question

HI ,
I have a table called trackCenterline .Below is the table.
What i want to do is If the segmentSequenceID is 1 it should pick the corresponding SegmentID i.e 10001 and Check for the same segment id in other table called TrackSegment which is below.  and pick the BeginMilepost of that segmentID and Update That
Milepost in a new table .At end SegmentSequenceID number it should pick ENDMilepost and update
TrackCenterline table.
TrackSegment table
In the below table for 10001 SegmentID it should pick BeginMilepost. For end Number of SegmentSequenceID in above table ID ends at 121 for that end sequenceID It should refer TrackSegment table below and pick EndMilepost and should be updated in another
table Milepost column.
after that a new segment starts with new sequence .and so on ...
bhavana

Answer 1

Hi Deepa_Deepu,
According to your description, since the issue regards T-SQL. I will help you move the question in the T-SQL forums at
http://social.technet.microsoft.com/Forums/en-US/home?forum=transactsql. It is appropriate and more experts will assist you.
When you want to check two columns from two tables then return some results and update the third table. I recommend you use join function and combine two tables, then use update select from statement for modifying the Mailpost table. You can refer to the
following T-SQL Statement.
-----using join to connect to two tables
select TrackCenterline.FeatureId,TrackCenterline.SegmentId,
TrackCenterline.SegmentSequenceId,TrackSegment.BeginMilepost,TrackSegment.EndMilepost
from dbo.TrackCenterline join dbo.TrackSegment
on TrackCenterline.SegmentId=TrackSegment.SegmentId
order by TrackCenterline.SegmentId, TrackCenterline.SegmentSequenceId
---the result shows as following.
FeatureId SegmentId SegmentSequenceId BeginMilepost EndMilepost
AMK100011 10001 1 61.0000 61.3740
AMK100012 10001 2 61.0000 61.3740
AMK100013 10001 3 61.0000 61.3740
AMK1000121 10001 121 61.0000 61.3740
AMK100021 10002 1 61.1260 61.7240
AMK100023 10002 3 61.1260 61.7240
AMK100033 10003 3 61.3740 62.9530
-----Then you can use update select from statement to modify the Mailpost table, Or you can post the table structure of Mailpost
And for more information, you can review the following article about update statement.
http://www.techonthenet.com/sql/update.php
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support