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Last week I was surprised to find out that sybase 12 doesn't support full outer joins. But it occurred to me that a full outer join should be the same as a left outer join unioned with a right outer join of the same sql. Can anybody think of a reason ...
Started by stu on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
You'd have to probably do a SELECT DISTINCT on the data set produced without the ALL , it will filter duplicates... .
UNION -ing two OUTER JOIN statements should result in duplicate rows representing the data you'd get from an INNER JOIN .
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What is the difference between left join and left outer join?
Started by KG Sosa on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Also note that the entire....
As per the documentation: FROM (Transact-SQL) :
<join_type>.
They are equivalent.
; ::= [ { INNER | { { LEFT | RIGHT | FULL } [ OUTER ] } } [ <join_hint> ] ] JOIN
The keyword OUTERNothing.
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What is the difference between an inner join and outer join? What's the precise meaning of these two kinds of joins?
Started by freenight on
, 10 posts
by 10 people.
Answer Snippets (Read the full thread at stackoverflow):
INNER JOIN returns rows that exist in both tables
OUTER JOIN returns all rows that exist in either excellent:
A Visual Explanation of SQL Joins
INNER JOIN
LEFT OUTER JOIN
Marc
Wikipedia to the rescue:
....
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Ask your Facebook Friends
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Why is the order of tables important when combining an outer & an inner join ? the following fails with postgres:
SELECT grp.number AS number, tags.value AS tag FROM groups grp, insrel archiverel LEFT OUTER JOIN ownrel ownrel ON grp.number = ownrel.dnumber...
Started by Thies Edeling on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
Archiverel ON archiverel.dnumber = grp.number LEFT OUTER JOIN ownrel ownrel ON grp.number = ownrel.dnumber LEFT OUTER JOIN tags tags ON tags.number = ownrel.snumber WHERE archiverel.snumber of the tables is not important.
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I have a main table that I must get data from. I have a left outer join where the fields will match 40% of the time. And then I have another join where I need to match the data from table A with.
This is the SQL in pseudo code. This query won't work.
...
Started by Berlin Brown on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Write it like this (but I could be reading your statement wrong)
FROM TABLE_A A LEFT OUTER JOIN TABLE_B HIST ON HIST.COL1 = A.COL1 LEFT OUTER JOIN TABLE_D H ON H.COL3 = A.STATE LEFT OUTER JOIN TABLE_C B associated....
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Var auditAgencyRecords = (from ag in db.Agencies join ara in db.AuditRuleAccounts on ag.Agency_Id equals ara.AgencyID join arr in db.AuditRuleResults on ara.AuditRuleAccountID equals arr.AuditRuleAccountID join are in db.AuditRuleEnterprises on arr.AuditRuleEnterpriseID...
Started by KingNestor on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
AuditAgencyRecords = ( from ag in db.Agencies group join ara in db.AuditRuleAccounts on ag.Agency_Id equals ara.AgencyID into AgAra = group from w in AgAra.DefaultIfEmpty() group join arr in db.AuditRuleResults in AraArr.DefaultIfEmpty(....
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What is the difference between INNER JOIN and OUTER JOIN?
Started by cdv on
, 6 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
A (left) outer join shows rows for each record on the left hand side, even it to OUTER LEFT JOIN SELECT Orders.OrderID, Orders.CustomerName FROM Orders LEFT JOIN OrderDetails
@ Kevin : An outer....
Of the join.
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What is the correct syntax to perform an outer join with the following requirements:
A left outer join B on A.c1 = B.c1
B left outer join C on B.c2 = C.c2
A left outer join D on A.c1 = D.c1
So A, B, and C cascade and A and D cascade.
I know how to write...
Started by David Bryan on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
This should work as you want:
SELECT * FROM A left outer join B on A.c1 = B.c1 left outer join C on B.c2 = C.c2 left outer join D on A.c1 = D.c1
the DB engine looks at what your are joining by indentation....
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Let's say I have two Django models Person and Company as follows: -
class Company(models.Model): name = models.CharField() class Person(models.Model): last_name = models.CharField(blank=True) first_name = models.CharField() company = models.ForeignKey...
Started by chefsmart on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Either I'm thinking of pre-1.0 behavior....
It should be as simple as:
Person.objects.filter(company_id__isnull=True)
Note the use of company_id which is the default integer field created by the ForeignKey
Edit
Sorry, I haven't actively used django since 0.9.5 .
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On outer join fetching , the Nhibernate documentation says:
If your database supports ANSI or Oracle style outer joins, outer join fetching might increase performance by limiting the number of round trips to and from the database (at the cost of possibly...
Started by Mark Rogers on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
OUTER JOINs should be used outer....
Use outer join fetching if necessary; certain queries will require outer join something by using eager loading (via outer join fetching f.i.).
Weird question.
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