title: What does 'reference..' mean in SQL syntax?
body: <pre><code>from
  [PMDB].[dbo].PROJECT P
  inner join PROJWBS PW on P.proj_id = PW.proj_id
  and PW.proj_node_flag = 'Y' and PW.wbs_short_name not like '%- B%'
  and PW.status_code &lt;&gt; 'WS_Planned' and PW.status_code &lt;&gt; 'WS_Whatif'
  inner join [PMDB].[dbo].TASKSUM TS on PW.proj_id = TS.proj_id and PW.wbs_id = TS.wbs_id
  inner join reference..fiscal_year_qtr_month FYQM on isnull(TS.act_end_date,P.scd_end_date) &gt; FYQM.fiscal_month_begin_datetime
  and isnull(TS.act_end_date,P.scd_end_date) &lt;= FYQM.fiscal_month_end_datetime
  inner join reference..mfg_year_month_ww MYMW on isnull(TS.act_end_date,P.scd_end_date) &gt; MYMW.mfg_ww_begin_datetime
  a
  </code></pre>
  
  <p>I have tried the internet, but just don't understand what does the 'reference..' mean here. Am I missing something?</p>