What is the difference between NOT IN and LEFT OUTER JOIN

Hello

I searched the difference between everywhere. But his powerlessness.
Please tell me the differences.

Thanks in advance
KVB

It's like comparing apples and oranges.

NOT IN - exclude all lines matching the condition NOT IN (beware of NULL values).

JOIN EXTERNAL - return of rows from the inner table even if there is no corresponding row in the outer table.

SQL> -- NOT IN
SQL> with x as
  2  (select 1 col1 from dual union all
  3   select 2 col1 from dual union all
  4   select 3 col1 from dual)
  5  ,    y as
  6  (select 1 col1 from dual)
  7  select *
  8  from   x
  9  where  col1 not in (1,2);

      COL1
----------
         3

SQL> -- NOT IN (subquery)
SQL>
SQL> with x as
  2  (select 1 col1 from dual union all
  3   select 2 col1 from dual union all
  4   select 3 col1 from dual)
  5  ,    y as
  6  (select 1 col1 from dual)
  7  select *
  8  from   x
  9  where  col1 not in (select col1 from y);

      COL1
----------
         2
         3

SQL> -- OUTER JOIN
SQL> with x as
  2  (select 1 col1 from dual union all
  3   select 2 col1 from dual union all
  4   select 3 col1 from dual)
  5  ,    y as
  6  (select 1 col1 from dual)
  7  select *
  8  from   x
  9  left outer join
 10         y
 11  on x.col1 = y.col1;

      COL1       COL1
---------- ----------
         1          1
         3
         2

SQL> -- Maybe it helps to contrast LOJ with just JOIN?
SQL> with x as
  2  (select 1 col1 from dual union all
  3   select 2 col1 from dual union all
  4   select 3 col1 from dual)
  5  ,    y as
  6  (select 1 col1 from dual)
  7  select *
  8  from   x
  9  join   y
 10  on x.col1 = y.col1;

      COL1       COL1
---------- ----------
         1          1

SQL> 

Tags: Database

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