sql server - Sql querying same table for overlapping dates -


i'm trying write query overlap in date range reported.

i able several queries, , loops, wondered if made more efficient 1 query, table joins itself.

the table structure is:

create table [dbo].[rentals]( [id] [int] identity(1,1) not null, [room_id] [int] not null, [check_in] [datetime] not null, [check_out] [datetime] not null, [customer_ref] [bigint] null)

so given same room_id, want able query if other booking same room_id falls between check_in , check_out of booking same room_id (to avoid double bookings).

i have use normal code, rather linq due existing project.

this have far, appears returning records:

select     r1.id, r1.room_id, r1.check_in, r1.check_out,r1.customer_ref       tblrental r1 inner join                   tblrental r2 on                       r1.room_id = r2.room_id ,                       r1.check_in < r2.check_out ,                       r1.check_out > r2.check_in

can refine query return records room_id same, , there overlap?

thanks help,

mark

i think problem crossing each row itself, , that's why query returns rows. make sure r1.id <> r2.id:

select     r1.id, r1.room_id, r1.check_in, r1.check_out,r1.customer_ref       tblrental r1 inner join                   tblrental r2 on                       r1.room_id = r2.room_id ,                       r1.check_in < r2.check_out ,                       r1.check_out > r2.check_in ,                      r1.id <> r2.id

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