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#1
October 9th, 2012, 07:15 PM
 jaeSun
got Rice?

Join Date: Nov 2004
Posts: 509
Time spent in forums: 4 Days 7 h 39 m 38 sec
Reputation Power: 9
Grabbing count of something, of items where count = 0

Trying to get a count of something, including count of items where count = 0

the example here is a simplified of the issue that I am working on.

Code:
```Table 1:  client
clientid|name|genderid|someotherid
-----------------
1|John|2|2
2|Jacob|2|2
3|Jason|2|0
4|Alice|3|0

Table 2:  gender
genderid|gender
-----------------
1|Alien
2|Male
3|Female```

I do SQL to get a total:

Code:
```SELECT Count(c.genderid),
g.gender
FROM   gender g
LEFT JOIN client c
ON c.genderid = g.genderid
GROUP  BY c.genderid,
g.gender ```

Results are like:

Code:
```Alien|0
Male|3
Female|1```

but if I add a WHERE statement, such as this:

Code:
```SELECT Count(c.genderid),
g.gender
FROM   gender g
LEFT JOIN client c
ON c.genderid = g.genderid
WHERE  c.someotherid = 2
GROUP  BY c.genderid,
g.gender ```

then the results are like:

Code:
`2|Male`

Female and Alien are not part of the results? How do I get it to include Female and Alien totals?

I found that I could do this:

Code:
```SELECT Count(c.genderid),
g.gender
FROM   gender g
LEFT JOIN client c
ON c.genderid = g.genderid
WHERE  c.someotherid = 2
GROUP  BY c.genderid,
g.gender
UNION
SELECT 0,
g2.gender
FROM   testgender g2
WHERE  g2.genderid NOT IN (SELECT g.genderid
FROM   gender g
LEFT JOIN client c
ON c.genderid = g.genderid
WHERE  c.someotherid = 2) ```

I am sure there is a better way of doing this?

#2
October 10th, 2012, 03:20 AM
 swampBoogie
Contributing User

Join Date: Jan 2003
Location: Paris Uppland
Posts: 2,351
Time spent in forums: 1 Month 4 Days 8 h 1 m 50 sec
Reputation Power: 390
Code:
```select count(c.genderid),
g.gender
from gender g
left
join client c
on c.genderid = g.genderid
and c.someotherid = 2
group
by g.gender```

The unmatched columns from the client table are null and thus the where clause will exclude those records.

#3
January 4th, 2013, 05:24 PM
 jaeSun
got Rice?

Join Date: Nov 2004
Posts: 509
Time spent in forums: 4 Days 7 h 39 m 38 sec
Reputation Power: 9
late reply, but thanks! got it working

 Viewing: Dev Shed Forums > Databases > PostgreSQL Help > Grabbing count of something, of items where count = 0

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