Problem with Inner Join

Hi All,

I am new to SAP and have been told by all abapers that using joins is a major performance issue but in below select i am using inner join with key fields on the tables because if i don't use joins then i have to use loops which will again a performace issue so please suggest me that how in my case joins is a performance issue and if it is then what's best way to do.

select

vk~vbeln

vk~erdat

vk~vkgrp

vk~kunnr

vk~lifsk " lifsk

k1a~name1 as sotonm

pa~kunnr as kunnr_pa

k1b~name1 as shtonm

vk~gwldt

vk~vdatu

vk~bstnk

tv~bezei

from vbak as vk

inner join

kna1 as k1a on vk_{kunnr = k1a}kunnr

inner join

vbpa as pa on vk_{vbeln = pa}vbeln and

pa~parvw = 'WE' and

pa~posnr = ''

inner join

kna1 as k1b on pa_{kunnr = k1b}kunnr

inner join

tvgrt as tv on vk_{vkgrp = tv}vkgrp

into corresponding fields of table ord_hdr

where vk~lifsk in dblock.

Thanks in advance,

Navdeep singh