Update statement failing in sql - sql

Question

Below update statement is giving me error, please correct me where I am going wrong
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near i
Msg 102, Level 15, State 1, Line 20
Incorrect syntax near u
Code:
Update [dbo].[ManPlan_Prescriber_Roster] i
set i.territory_no = u.territory_no,
i.key_sales_force = u.key_sales_force,
i.territory_type_id = u.territory_type_id,
i.territory_type_descr = u.territory_type_descr,
i.last_name = u.last_name,
i.first_name = u.first_name,
i.mi = u.mi,
i.territory_orig_assign_dt = u.territory_orig_assign_dt,
i.territory_strt_dt = u.territory_strt_dt,
i.email_address = u.email_address,
i.cell_phone = u.cell_phone,
i.fcl_addr1 = u.fcl_addr1,
i.fcl_city = u.fcl_city,
i.fcl_st = u.fcl_st,
i.fcl_zip = u.fcl_zip
from
[dbo].[ManPlan_Prescriber_Roster] m
join
(select
territory_no,
key_sales_force,
territory_type_id,
territory_type_descr,
last_name,
first_name,
mi,
territory_orig_assign_dt,
territory_strt_dt,
email_address,
cell_phone,
fcl_addr1,
fcl_city,
fcl_st,
fcl_zip
from
[dbo].[RepRosterUpd$]
where
filedt = '2016-05-18') u on m.territory_no = u.territory_no
and m.key_sales_force = u.key_sales_force
and m.territory_type_id = u.territory_type_id
Thanks

Answer 1

If you use the table you want to update in the from clause and give it an alias there (here: m), then you must use that alias in your UPDATE statement, too: UPDATE m SET ..... - you cannot "redefine" the table with another alias at the top of your UPDATE statement
Try this:
Update m // use the alias you've defined on the FROM line!
set m.territory_no = u.territory_no,
m.key_sales_force = u.key_sales_force,
......
m.fcl_zip = u.fcl_zip
from
[dbo].[ManPlan_Prescriber_Roster] m // use this alias in UPDATE
join
(select
territory_no,
key_sales_force,
.....
fcl_zip
from
[dbo].[RepRosterUpd$]
where
filedt = '2016-05-18') u on m.territory_no = u.territory_no
and m.key_sales_force = u.key_sales_force
and m.territory_type_id = u.territory_type_id