Need help writing a MySQL query that will return only records with matching counter-parts

Since I don't know how to explain this easily, I'm using the
table below as an example.
I want to create a MySQL query that will return only records
that have matching counter-parts where 'col1' = 'ABC'.
Notice the 'ABC / GHI' record does not have a
counter-matching 'GHI / ABC' record. This record should not be
returned because there is no matching counter-part. With this
table, the 'ABC / GHI' record should be the only one returned in
the query.
How can I create a query that will do this?
id | col1 | col2
1 | ABC | DEF
2 | DEF | ABC
3 | ABC | GHI
4 | DEF | GHI
5 | GHI | DEF
*Please let me know if you have no idea what I'm trying to
explain.

AngryCloud wrote:
> Since I don't know how to explain this easily, I'm using
the table below as an
> example.
>
> I want to create a MySQL query that will return only
records that have
> matching counter-parts where 'col1' = 'ABC'.
>
> Notice the 'ABC / GHI' record does not have a
counter-matching 'GHI / ABC'
> record. This record should not be returned because there
is no matching
> counter-part. With this table, the 'ABC / GHI' record
should be the only one
> returned in the query.
>
> How can I create a query that will do this?
>
>
> id | col1 | col2
> --------------------
> 1 | ABC | DEF
> 2 | DEF | ABC
> 3 | ABC | GHI
> 4 | DEF | GHI
> 5 | GHI | DEF
>
>
> *Please let me know if you have no idea what I'm trying
to explain.
>
Please be more clear. You say that 'ABC / GHI' should not be
returned,
and then you say that 'ABC / GHI' should be the only one
returned. Can't
have both...

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try this [Not fully tested]
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
Elapsed: 00:00:00.00
SQL> SELECT *
2    FROM (SELECT order_id, event_id, evnt_date, state_code, next_evntid,
3                 ROW_NUMBER () OVER (PARTITION BY event_id ORDER BY NULL)
4                                                                       AS rownm
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6                       (SELECT 10 AS order_id, 16937555 AS event_id,
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8                          FROM DUAL
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11                          FROM DUAL
12                        UNION ALL
13                        SELECT 10, 16308004, 20100129, 'OCCURRED'
14                          FROM DUAL
15                        UNION ALL
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17                          FROM DUAL
18                        UNION ALL
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20                          FROM DUAL
21                        UNION ALL
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23                          FROM DUAL
24                        UNION ALL
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27                        UNION ALL
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29                          FROM DUAL
30                        UNION ALL
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34                         LEAD (event_id, 1, 0) OVER (PARTITION BY order_id ORDER BY NULL)
35                                                                 AS next_evntid
36                    FROM t)
37           WHERE event_id = next_evntid)
38   WHERE rownm <= 2
39 /
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        20   17134164   20100223 COMPLETE    17134164          1
        20   17134164   20100223 ACTIVE      17134164          2
Elapsed: 00:00:00.00
SQL> PS - You should seriously think about ordering the data before you do this kind off operations.
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Need help writing a MySQL query that will return only records with matching counter-parts

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