What is the difference between "INNER JOIN" and "OUTER JOIN"?



Also how do `LEFT JOIN`, `RIGHT JOIN` and `FULL JOIN` fit in?
Assuming you're joining on columns with no duplicates, which is a very common case:

* An inner join of A and B gives the result of A intersect B, i.e. the inner part of a [Venn diagram](http://en.wikipedia.org/wiki/Venn_diagram) intersection.
* An outer join of A and B gives the results of A union B, i.e. the outer parts of a Venn diagram union.

**Examples**

Suppose you have two tables, with a single column each, and data as follows:


```
A    B
-    -
1    3
2    4
3    5
4    6

```
Note that (1,2) are unique to A, (3,4) are common, and (5,6) are unique to B.

**Inner join**

An inner join using either of the equivalent queries gives the intersection of the two tables, i.e. the two rows they have in common.


```
select * from a INNER JOIN b on a.a = b.b;
select a.*, b.*  from a,b where a.a = b.b;

a | b
--+--
3 | 3
4 | 4

```
**Left outer join**

A left outer join will give all rows in A, plus any common rows in B.


```
select * from a LEFT OUTER JOIN b on a.a = b.b;
select a.*, b.*  from a,b where a.a = b.b(+);

a |  b
--+
1 | null
2 | null
3 |    3
4 |    4

```
**Right outer join**

A right outer join will give all rows in B, plus any common rows in A.


```
select * from a RIGHT OUTER JOIN b on a.a = b.b;
select a.*, b.*  from a,b where a.a(+) = b.b;

a    |  b
+
3    |  3
4    |  4
null |  5
null |  6

```
**Full outer join**

A full outer join will give you the union of A and B, i.e. all the rows in A and all the rows in B. If something in A doesn't have a corresponding datum in B, then the B portion is null, and vice versa.


```
select * from a FULL OUTER JOIN b on a.a = b.b;

 a   |  b
+
   1 | null
   2 | null
   3 |    3
   4 |    4
null |    6
null |    5

```
unfortunately that's not how it works. it's db mapping, and we're talking about joined-tables hierarchy. so the "other side" of the association must be in the referenced table (the detail one, not custom detail). direction: a word and number arrangement machine when given an input line of word and numbers rearranges them following a particular rule in each step. the following is an illustration of input and rearrangement. input: politics 61 policy 116 partner 93 role 45 clear 27 38 point step i: role politics policy 116 partner 93 45 clear 27 38 point 61 step ii: role clear politics policy partner 93 45 27 38 point 116 61 step iii: role clear partner politics policy 93 45 38 point 27 116 61 step iv: role clear partner politics policy 93 38 point 45 27 116 61 step v: role clear partner politics point policy 93 38 45 27 116 61 step v, is the last step of the above arrangement as the intended arrangement is obtained. as per the rule followed in the given steps find out the appropriate steps for the given input. input: energy 54 78 place 23 issue 211 145 flat rent taxi 17in step iii, what is the difference between fifth element from left and second element from right? loosen, unloose, let go, dark horse, unseal, divide, refuse, unlock, loose, unclasp, disconnect, disjoin, open, unfasten, release, key, withdraw, separate, long shot. loopback basically applies user policy as a computer policy.
merge vs replace is how the policy gets applied.
merge mode
in this mode, when the user logs on, the user's list of gpos is typically gathered by using the getgpolist function. the getgpolist function is then called again by using the computer's location in active directory. the list of gpos for the computer is then added to the end of the gpos for the user. this causes the computer's gpos to have higher precedence than the user's gpos. in this example, the list of gpos for the computer is added to the user's list.
replace mode
in this mode, the user's list of gpos is not gathered. only the list of gpos based on the computer object is used. hi, @ricky007 
create table bill\_stag
(
s\_categry varchar2(20),
s\_billnum varchar2(20)
);

insert into bill values('1111','5647859541785');
watch out! you're using two different table names there.
you don't care which m\_billnum\_seq gets assigned to which new row, do you? (you shouldn't.) in that case, you can simplify the cross join approach that cormaco suggested like this:
insert into bill\_mast (m\_bill\_seqnum, m\_billnum, channel) -- always name the columns
with  all\_channels  as
(
 select 'mob' as channel  from dual  union all
 select 'atm'      from dual
)
select  seq\_num.nextval
, s.s\_billnum
, c.channel
from     bill\_stag    s
cross join all\_channels c
;
you don't need order by, so you don't need the ord column and you don't need so an extra sub-query. If you're unsure of writing joins in SQL use an SQL builder.


Top of my list is still SQLeo which is java based. If you make a small donation you get the full thing, you only need to donate a dollar.


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 tuesday, april 5, 2016 - authority compliance manager (9,1) - a leader who emphasizes efﬁcient production - country club manager (1,0) - a leader who has great concern for people and little concern for production, attempts to avoid conﬂict, and seeks to be well liked �4 
 tuesday, april 5, 2016 - team manager (9,9) - a leader who builds a highly productive team of committed people - impoverished manager (1,1) - a leader who exerts just enough effort to get by (1,1) should be on the bottom left of grid - paternalistic “father knows best” manager (9+9) - a leader who promises reward and threatens punishment �5 
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