Vimal,
Please check the below steps :
1) create a new role "test_role" as below.
1> use master
2> go
1> create role test_role
2> go
2) create a new login user "testuser" to access your database SAPSR3DB.
1> sp_addlogin testuser, testuser, SAPSR3DB
2> go
1> use SAPSR3DB
2> go
1> sp_adduser testuser , testuser
2> go
New user added.
3) grant SELECT (READ) permission to the new role.
1> create table t1 (a int)
2> go
1> insert into t1 values (1)
2> go
(1 row affected)
1> grant SELECT on t1 to test_role
2> go
4) grant the role to the required login user.
1> use master
2> go
1> grant role test_role to testuser
2> go
1> sp_modifylogin testuser, "add default role", test_role
2> go
5) Connect using "testuser" and access the table.
$ isql -Utestuser -SASE157 -Ptestuser
1> select * from SAPSR3DB..t1
2> go
Hope this will be helpful.
~Gaurav