The summary is written to a temporary table, which then is joined to the cat_mailing table to produce the reco : Join Select « Join « SQL / MySQL

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SQL / MySQL » Join » Join Select 




The summary is written to a temporary table, which then is joined to the cat_mailing table to produce the reco
    
rds that match those names
mysql> CREATE TABLE cat_mailing
    -> (
    ->  last_name       CHAR(40NOT NULL,
    ->  first_name      CHAR(40NOT NULL,
    ->  street          CHAR(40NOT NULL
    -> );
Query OK, rows affected (0.01 sec)

mysql>
mysql> INSERT INTO cat_mailing (first_name, last_name, street)
    ->  VALUES
    ->          ('Jim','Isaacson','515 Fordam St., Apt. 917'),
    ->          ('Wallace','Baxter','57 3rd Ave.'),
    ->          ('Taylor','McTavish','432 River Run'),
    ->          ('Marlene','Pinter','Sunset Trail'),
    ->          ('WALLACE','BAXTER','57 3rd Ave.'),
    ->          ('Bartholomew','Brown','432 River Run'),
    ->          ('Marlene','Pinter','Sunset Trail'),
    ->          ('Wallace','Baxter','57 3rd Ave., Apt 102')
    -> ;
Query OK, rows affected (0.00 sec)
Records: 8  Duplicates: 0  Warnings: 0

mysql>
mysql> SELECT FROM cat_mailing;
+-----------+-------------+--------------------------+
| last_name | first_name  | street                   |
+-----------+-------------+--------------------------+
| Isaacson  | Jim         | 515 Fordam St., Apt. 917 |
| Baxter    | Wallace     | 57 3rd Ave.              |
| McTavish  | Taylor      | 432 River Run            |
| Pinter    | Marlene     | Sunset Trail           |
| BAXTER    | WALLACE     | 57 3rd Ave.              |
| Brown     | Bartholomew | 432 River Run            |
| Pinter    | Marlene     | Sunset Trail           |
| Baxter    | Wallace     | 57 3rd Ave., Apt 102     |
+-----------+-------------+--------------------------+
rows in set (0.00 sec)

mysql>
mysql>
mysql> CREATE TABLE tmp
    -> SELECT COUNT(*AS count, last_name, first_name
    -> FROM cat_mailing GROUP BY last_name, first_name HAVING count > 1;
Query OK, rows affected (0.01 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql>
mysql> SELECT cat_mailing.*
    -> FROM tmp, cat_mailing
    -> WHERE tmp.last_name = cat_mailing.last_name
    -> AND tmp.first_name = cat_mailing.first_name
    -> ORDER BY last_name, first_name;
+-----------+------------+----------------------+
| last_name | first_name | street               |
+-----------+------------+----------------------+
| Baxter    | Wallace    | 57 3rd Ave., Apt 102 |
| BAXTER    | WALLACE    | 57 3rd Ave.          |
| Baxter    | Wallace    | 57 3rd Ave.          |
| Pinter    | Marlene    | Sunset Trail       |
| Pinter    | Marlene    | Sunset Trail       |
+-----------+------------+----------------------+
rows in set (0.00 sec)

mysql>
mysql> drop table cat_mailing;
Query OK, rows affected (0.00 sec)

mysql> drop table tmp;
Query OK, rows affected (0.00 sec)

   
    
    
    
  














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