Groups > comp.databases.ms-sqlserver > #1897

left join not quite working

X-Received	by 10.140.151.75 with SMTP id 72mr10391964qhx.3.1424994669929; Thu, 26 Feb 2015 15:51:09 -0800 (PST)
X-Received	by 10.50.178.180 with SMTP id cz20mr12811igc.14.1424994669733; Thu, 26 Feb 2015 15:51:09 -0800 (PST)
Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!i13no8648326qae.0!news-out.google.com!qk8ni43839igc.0!nntp.google.com!hl2no32677838igb.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups	comp.databases.ms-sqlserver
Date	Thu, 26 Feb 2015 15:51:09 -0800 (PST)
Complaints-To	groups-abuse@google.com
Injection-Info	glegroupsg2000goo.googlegroups.com; posting-host=71.95.163.250; posting-account=99cyNgoAAAA03l-zLDrnoY7TEbs-AvM9
NNTP-Posting-Host	71.95.163.250
User-Agent	G2/1.0
MIME-Version	1.0
Message-ID	<c0762c65-7f65-474d-813a-1d399447b7a2@googlegroups.com> (permalink)
Subject	left join not quite working
From	"M.G." <michael@gurfinkel.us>
Injection-Date	Thu, 26 Feb 2015 23:51:09 +0000
Content-Type	text/plain; charset=ISO-8859-1
Lines	58
Xref	csiph.com comp.databases.ms-sqlserver:1897

Show key headers only | View raw

I need to show list of employees along with their scheduled work hours for a given date. If employee was not scheduled to work, then the hours should be empty on his/her line.

Here is my setup (SQL 2008)
declare @EMPLOYEES	table (
	EMPL_ID		int		NOT NULL
,	EMPL_NAME	varchar(64)
)
insert into @EMPLOYEES(EMPL_ID,EMPL_NAME) values
( 100,	'JOHN'),
( 200,	'BOB'),
( 300,	'MARY');


declare @SCHEDULED	table (
	EMPL_ID		int		NOT NULL
,	WORK_DATE	date	NOT NULL
,	WORK_HOURS	int		NOT NULL
)
insert into @SCHEDULED(EMPL_ID, WORK_DATE, WORK_HOURS) values
( 100,	'20150106',	8),
( 100,	'20150107',	8),
( 100,	'20150108',	8),
( 200,	'20150107',	6);

So, I expect to get three records in my report regardless of the day specified.



This is my SQL statement:

select E.EMPL_ID, E.EMPL_NAME, S.WORK_DATE, S.WORK_HOURS
from	
		@EMPLOYEES E
left join	@SCHEDULED S	on E.EMPL_ID=S.EMPL_ID

where		S.WORK_DATE = '20150107' or S.EMPL_ID IS NULL;

It results in :

EMPL_ID	EMPL_NAME WORK_DATE WORK_HOURS
======= ======= ========== =======
100	JOHN	2015-01-07	8
200	BOB	2015-01-07	6
300	MARY	NULL	NULL

Which is correct.

If I use 20150206, my result is:

100	JOHN	2015-01-06	8
300	MARY	NULL	NULL

So, I am missing record for BOB, as I would expect to se BOB with NULLS in the report

If I use date of 20150131 I expect to get three lines with all hours being NULLS, but my result is only one record:

300	MARY	NULL	NULL

Please help me with this situation, any ideas would be appreciated.

Back to comp.databases.ms-sqlserver | Previous | Next — Next in thread | Find similar

Thread

left join not quite working "M.G." <michael@gurfinkel.us> - 2015-02-26 15:51 -0800
  Re: left join not quite working "M.G." <michael@gurfinkel.us> - 2015-02-26 18:03 -0800
    Re: left join not quite working bradbury9 <ray.bradbury9@gmail.com> - 2015-02-27 00:16 -0800
    Re: left join not quite working Gene Wirchenko <genew@telus.net> - 2015-02-27 10:23 -0800

csiph-web