Question

I have 2 tables. One is main table and other one is login table. I may have 10 Records in Main table and 6 Records in login table. Each login id has to be assingned equally to main table. Can any one please give me the best solution to update the login information.

Example

Create table ##t1 
(id int identity,
name varchar(5),
loginid varchar(10)
divno char(3))




create table ##l1
(
id int identity,
name varchar(10),divno char(3))

insert into ##t1 values
('Jin',null,'001')
insert into ##t1 values
('Anu',null,'001')
insert into ##t1 values
('kir',null'002')
insert into ##t1 values
('Asi',null,'003')
insert into ##t1 values
('Nil',null,'002')
insert into ##t1 values
('sup',null,'003')
insert into ##t1 values
('amu',null,'003')
insert into ##t1 values
('mani',null,'003')

insert into ##l1 values
('A','001')
insert into ##l1 values
('B','001')
insert into ##l1 values
('C','002')
insert into ##l1 values
('D','002')
insert into ##l1 values
('E','002')
insert into ##l1 values
('F','003')

Data Example

Main table

id          name  loginid divno
----------- ----- ----------
1           Jin   NULL    001
2           Anu   NULL    001
3           kir   NULL    002
4           Asi   NULL    003
5           Nil   NULL    002
6           sup   NULL    003
7           amu   NULL    003
8           mani  NULL    003

Login Table

id          name    divno
----------- -------------
1           A        001
2           B        001
3           C        002
4           D        002
5           E        002
6           F        003

desired output

How can we do this without looping?

Answer 1

 update ##t1 
 set loginid = #l1.name
 from   
      ##t1
           inner join 
      (select *, (ROW_NUMBER() Over (order by id) -1)% (select COUNT(*) from ##l1)+1 as rn from ##t1) v
           on ##t1.id = v.id
           inner join 
      ##l1 
           on v.rn = ##l1.id