Pair value vs and operator : Row « String « SQL / MySQL

1. SQL / MySQL
2. String
3. Row

Pair value vs and operator

      
mysql>
mysql> CREATE TABLE Employee
    ->       (NAME         CHAR(10) NOT NULL,
    ->        INITIALS     CHAR(3) NOT NULL,
    ->        TOWN         VARCHAR(30) NOT NULL,
    ->        PRIMARY KEY (NAME, INITIALS));
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO Employee VALUES ('Link', 'R', 'Stratford');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO Employee VALUES ('Link', 'P', 'Stratford');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> INSERT INTO Employee VALUES ('Miller', 'P', 'Douglas');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> CREATE TABLE PENALTIES
    ->       (PAYMENTNO    INTEGER NOT NULL,
    ->        NAME         CHAR(10) NOT NULL,
    ->        INITIALS     CHAR(3) NOT NULL,
    ->        AMOUNT       DECIMAL(7,2) NOT NULL,
    ->        PRIMARY KEY (PAYMENTNO),
    ->        FOREIGN KEY (NAME, INITIALS)
    ->           REFERENCES Employee (NAME, INITIALS));
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO PENALTIES VALUES (1, 'Link', 'R', 100.00);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (2, 'Miller', 'P', 200.00);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT   NAME, INITIALS, TOWN
    -> FROM     Employee
    -> WHERE    NAME IN
    ->         (SELECT   NAME
    ->          FROM     PENALTIES)
    -> AND      INITIALS IN
    ->         (SELECT   INITIALS
    ->          FROM     PENALTIES);
+--------+----------+-----------+
| NAME   | INITIALS | TOWN      |
+--------+----------+-----------+
| Link   | R        | Stratford |
| Link   | P        | Stratford |
| Miller | P        | Douglas   |
+--------+----------+-----------+
3 rows in set (0.00 sec)

mysql>
mysql>
mysql> SELECT   NAME, INITIALS, TOWN
    -> FROM     Employee
    -> WHERE   (NAME, INITIALS) IN
    ->         (SELECT   NAME, INITIALS
    ->          FROM     PENALTIES);
+--------+----------+-----------+
| NAME   | INITIALS | TOWN      |
+--------+----------+-----------+
| Link   | R        | Stratford |
| Miller | P        | Douglas   |
+--------+----------+-----------+
2 rows in set (0.00 sec)

mysql>
mysql>
mysql> SELECT   NAME, INITIALS, TOWN
    -> FROM     Employee
    -> WHERE    NAME IN
    ->         (SELECT   NAME
    ->          FROM     PENALTIES
    ->          WHERE    Employee.INITIALS =
    ->                   PENALTIES.INITIALS);
+--------+----------+-----------+
| NAME   | INITIALS | TOWN      |
+--------+----------+-----------+
| Link   | R        | Stratford |
| Miller | P        | Douglas   |
+--------+----------+-----------+
2 rows in set (0.00 sec)

mysql>
mysql> drop table Employee;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table PENALTIES;
Query OK, 0 rows affected (0.00 sec)

mysql>

   
    
    
    
    
    
  

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