sql update table set - The multi-part identifier could not be bound

Question

I have 2 tables:

• Table1 = names of gas stations (in pairs)
• Table2 = has co-ordinate information (longitude and latit

Answer 1

You need to change the inner table and give a different allias to the columns that are similar. This should work.

update table1
set [Lattitude1] = x.[lat]
from 
(
    SELECT IDInfo [id], Lattitude [lat] FROM 
    table2
) x
WHERE
StationID1 = x.[id]

In your particular case its not necessary to rename Lattitude to lat, but if you end up updating a table with itself and force yourself into giving the columns different names, it will save you headaches down the road.

Answer 2

I think you can modify your UPDATE statement to reference the table alias in the UPDATE line.

update t1
set t1.[Lattitude1] = t2.[Lattitude]
from table1 t1
left join table2 t2 
on (t1.StationID1 = t2.IDInfo)