Why does UNION ALL seem to wait for both queries to finish?

Why does UNION ALL seem to wait for both queries to finish?

search resultsmysql - Why does UNION ALL seem to wait for both queries to ...
Why does UNION ALL seem to wait for both queries to finish? ... Running
this query: select null, "hello" union all select ... so this seems to
prove it. So, why can't ...
stackoverflow.com/questions/15253399/​why-does-union-all... - Cached

python - How to wait until MySQLdb cursor finish running all ...
How to wait until MySQLdb cursor finish running all queries. up vote 0
down vote favorite. 1. ... Why does UNION ALL seem to wait for both
queries to finish? 1.
stackoverflow.com/...to-wait...finish-​running-all-queries - Cached

query with union does not finish | Oracle Forums
Hi all, on 11 gR2 my query does not finish : ... client server NOT IN WAIT
... modify it but know why it does not end ? Both of them (UNION and ...
forums.oracle.com/thread/2492928 - Cached

SQL SERVER – Difference Between Union vs. Union All ...
A UNION statement effectively does a SELECT ... execute both of them,
Query 1 takes more ... % for table scan for UNION ALL and 18% for UNION.
Why is it so ...
blog.sqlauthority.com/2009/...between-​union-vs-union-all... - Cached

SQLServerCentral / SQL Server 2005 / SQL Server 2005 ...
Then do an insert to simulate the rest of the union all.[/quote]Both
queries ... a UNION ALL does change ... the cause of the wait, while the
query was ...
www.sqlservercentral.com/Forums/​RssFeed360-945836-0-2.aspx

MS SQL Server :: SQL 2005 Latch Wait Time
Thequery is slow only in production.When running this query in both DB ...
Why Does UNION ALL Wait ... It seems strange to me that once the UNION ALL
...
www.bigresource.com/MS_SQL-SQL-2005-​Latch-Wait-Time... - Cached

MS SQL Server :: PAGEIOLATCH_SH Wait - BigResource: Webmaster ...
Why Does UNION ALL Wait For A Row From ... When running this query in both
DB and looking at ... the next task and does not wait for it to finish.
...
www.bigresource.com/MS_SQL-PAGEIOLATCH_​SH-wait-Dl6DVN4t.html - Cached

OraFAQ Forum: Performance Tuning » UNION causing slow ...
... combining 2 individual queries. Both individual ... The UNION ALL is
faster because it does not have to ... That makes sense why the UNION ALL
is ...
www.orafaq.com/forum/t/121396/2 - Cached

How to wait for "drawImage" to finish (NOT return ...
This does seem to work, ... it appears that a long-running union-query is
'kicked off' in a macro ... I need wait for finish zip and then continue
with the rest.
www.experts-exchange.com/Programming/​Languages/Java/Q...
More results from experts-exchange.com »
Make Macrro wait until data connection query refresh ...
In the macro above it seems this line initiates the refresh but code
execution does not wait until the ... verified All Experts ... union-query
is 'kicked off' in a ...
www.experts-exchange.com/Software/​Office_Productivity/...