Left Outer Join does not work why?

Hello

I have a question I want to return all the id group grp_id table and count and give me a count of all "active" members in the Member table. There are a few members who are not active in the table of members who belong to groups in the grp_id table. I still want a record returned for these grpid, but since there is no active members for these groups, I would like a zero as the mbr_count. An active mbr is the one whose eff_dt is less than the date of the day and whose exp_dt is greater than today's date.

I have listed the query below, which returns active records mbr, but unfortunately does not return a grpid (as in my example of data) is not an active member (grpid: has ""). I have also provided the DDL for both tables as well as some examples of data that gives me the (Incorrect) results, that I posted. I have also posted what I need (the 'Correct' results).

Thanks for any help... (I use PL/SQL)

THE QUERY I USE:
=============
SELECT
G00.grpid,
Count (M00.grpid) mbr_count
Of
g00 grp_id
LEFT OUTER JOIN
m00 MBR on
G00.grpid = m00.grpid
WHERE
M00.eff_dt < sysdate
AND
M00.exp_dt > sysdate
GROUP BY
G00.grpid

It gives me results like:

INCORRECT RESULTS:
===============
GRPID MBR_COUNT
A 2
B 2
C 1

I want to see is:

CORRECT RESULTS
===============
GRPID MBR_COUNT
A 2
B 2
C 1
D 0


Here's the DOF and the sample data:

create table grp_id (grpid varchar (1))

insert into grp_id values ('A')
insert into grp_id values ('B')
insert into grp_id values ('C')
insert into grp_id values (')

Commit

create table mbr (mbr_name varchar (10), varchar (1) grpid, eff_dt date, exp_dt date)

insert into values of mbr ('BRAND', 'A', to_date (January 1, 2011 ',' DD-MM-YYYY '), to_date (July 1, 2011 ',' DD-MM-YYYY '))
insert into values of mbr ('BRAND', 'A', to_date (July 1, 2011 ',' DD-MM-YYYY '), to_date (1 January 2012 ',' DD-MM-YYYY '))

insert into values of mbr ('MARTY', 'A', to_date (January 1, 2011 ',' DD-MM-YYYY '), to_date (July 1, 2011 ',' DD-MM-YYYY '))
insert into values of mbr ('MARTY', 'A', to_date (July 1, 2011 ',' DD-MM-YYYY '), to_date (1 January 2012 ',' DD-MM-YYYY '))

insert into values of mbr ('FRANK', 'B', to_date (January 1, 2011 ',' DD-MM-YYYY '), to_date (July 1, 2011 ',' DD-MM-YYYY '))
insert into values of mbr ('FRANK', 'B', to_date (July 1, 2011 ',' DD-MM-YYYY '), to_date (1 January 2012 ',' DD-MM-YYYY '))

insert into values of mbr ('MARY', 'B', to_date (January 1, 2011 ',' DD-MM-YYYY '), to_date (July 1, 2011 ',' DD-MM-YYYY '))
insert into values of mbr ('MARY', 'B', to_date (July 1, 2011 ',' DD-MM-YYYY '), to_date (1 January 2012 ',' DD-MM-YYYY '))

insert into values of mbr ('JOHN', 'C', to_date (January 1, 2011 ',' DD-MM-YYYY '), to_date (July 1, 2011 ',' DD-MM-YYYY '))
insert into values of mbr ('JOHN', 'C', to_date (July 1, 2011 ',' DD-MM-YYYY '), to_date (1 January 2012 ',' DD-MM-YYYY '))

insert into values of mbr ("NOAM" 'd', to_date (January 1, 2011 ',' DD-MM-YYYY '), to_date (July 1, 2011 ',' DD-MM-YYYY ') ")

Thanks for the script, shame on the missing semicolon :)

Your date restrictions are implemented as "filter predicates" rather than "join predicates.
that is the difference between a place ANDS extra o in the JOIN clause.

SQL> SELECT
  2  g00.grpid,
  3  count(m00.grpid) mbr_count
  4  FROM
  5  grp_id g00
  6  LEFT OUTER JOIN
  7  mbr m00 on
  8  g00.grpid = m00.grpid
  9  WHERE
 10  m00.eff_dt < sysdate
 11  AND
 12  m00.exp_dt > sysdate
 13  GROUP BY
 14  g00.grpid
 15  /

G  MBR_COUNT
- ----------
A          4
B          4
C          2

SQL> SELECT
  2  g00.grpid,
  3  count(m00.grpid) mbr_count
  4  FROM
  5  grp_id g00
  6  LEFT OUTER JOIN
  7  mbr m00 on
  8  g00.grpid = m00.grpid
  9  AND
 10  m00.eff_dt < sysdate
 11  AND
 12  m00.exp_dt > sysdate
 13  GROUP BY
 14  g00.grpid;

G  MBR_COUNT
- ----------
D          0
A          4
B          4
C          2

SQL>

Tags: Database

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