c# - sql query, selecting data through 3 tables -

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i have db below: (sorry couldn't upload diagram)

group table:

grp_id smallint  grp_name char(50)

type table:

tp_id smallint  tp_name char(50)

item table:

it_id int  grp_id smallint   tp_id smallint

item table linked group table grp_id, , linked type table via tp_id.

the user enter grp_name or grp_id, , should realize item have group , add type names of them, type table checklistbox.

select it_id, tp_name item inner join type on type.tp_id = item.tp_id inner join [group] on [group].grp_id = item.grp_id [group].grp_id = @groupid or [group].grp_name = @groupname

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