updating table A from Table B

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The query is a follows

Table A
gid(pK) Flag Buffer_distance the_geom
1 1 23
2 2 235
3 1 55
4 3 66
5 2 42
6 1 2123

Table B
GID (PK) Buffer_distance
1 1000
2 2000
3 3000
table a should get the buffer distance from table B and when I change the value of flag in table A and along with this it should also update the_geom colmn

Table A
gid(pK) Flag Buffer_distance the_geom
1 1 23
2 2 235
3 3 3000
4 3 66
5 2 42
6 1 2123

the result should be like this and the_geom field also change dynamically

i want a trigger that i always update the flag in table A it should fetch the buffer distance from table B and replace it with Buffer_distance in table A and its geometry field should also change.

regards
Manish sharma

Posted 14-Nov-12 16:20pm

manesh sharma

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Divya RS · Answer 1 · 2012-11-14T23:14:00

Your trigger should be more or less like this one..

SQL

Alter TRIGGER rowInsteadOfupDATE ON [dbo].[Table_1]
INSTEAD OF Update
AS
    declare @flag int;
    declare @distance int;
    declare @gid int;
    select  @flag =i. flag from inserted i;;
    select @gid =i.gid from inserted i;
    BEGIN
        Select @distance=distance from Table_2 where gid=@flag
        print @distance
        print @flag
            update Table_1 set flag=@flag, distance=@distance where gid=@gid;

              PRINT 'Record Updated ';

    END
GO