If ELSE is omitted, the null value is returned.

      
mysql>
mysql> CREATE TABLE PLAYERS
    -> (
    ->     PLAYERNO INTEGER NOT NULL,
    ->     NAME CHAR(15) NOT NULL,
    ->     INITIALS CHAR(3) NOT NULL,
    ->     BIRTH_DATE DATE ,
    ->     SEX CHAR(1) NOT NULL,
    ->     JOINED SMALLINT NOT NULL,
    ->     STREET VARCHAR(30) NOT NULL,
    ->     HOUSENO CHAR(4) ,
    ->     POSTCODE CHAR(6) ,
    ->     TOWN VARCHAR(30) NOT NULL,
    ->     PHONENO CHAR(13) ,
    ->     LEAGUENO CHAR(4) ,
    ->     PRIMARY KEY (PLAYERNO)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO PLAYERS VALUES (2, 'Everett', 'R', '1948-09-01', 'M', 1975, 'Stoney Road','43', '3575NH', 'Stratford'
, '070-237893', '2411');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (6, 'Parmenter', 'R', '1964-06-25', 'M', 1977, 'Haseltine Lane','80', '1234KK', 'Strat
ford', '070-476537', '8467');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (7, 'Wise', 'GWS', '1963-05-11', 'M', 1981, 'Edgecombe Way','39', '9758VB', 'Stratford
', '070-347689', NULL);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (8, 'Newcastle', 'B', '1962-07-08', 'F', 1980, 'Station Road','4', '6584WO', 'Inglewoo
d', '070-458458', '2983');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (27, 'Collins', 'DD', '1964-12-28', 'F', 1983, 'Long DRay','804', '8457DK', 'Eltham',
'079-234857', '2513');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (28, 'Collins', 'C', '1963-06-22', 'F', 1983, 'Old Main Road','10', '1294QK', 'Midhurs
t', '010-659599', NULL);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (39, 'Bishop', 'D', '1956-10-29', 'M', 1980, 'Eaton Square','78', '9629CD', 'Stratford
', '070-393435', NULL);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (44, 'Baker', 'E', '1963-01-09', 'M', 1980, 'Lewis Street','23', '4444LJ', 'Inglewood'
, '070-368753', '1124');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (57, 'Brown', 'M', '1971-08-17', 'M', 1985, 'Edgecombe Way','16', '4377CB', 'Stratford
', '070-473458', '6409');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (83, 'Hope', 'PK', '1956-11-11', 'M', 1982, 'Magdalene Road','16A', '1812UP', 'Stratfo
rd', '070-353548', '1608');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (95, 'Miller', 'P', '1963-05-14', 'M', 1972, 'High Street','33A', '5746OP', 'Douglas',
 '070-867564', NULL);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (100, 'Parmenter', 'P', '1963-02-28', 'M', 1979, 'Haseltine Lane','80', '6494SG', 'Str
atford', '070-494593', '6524');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (104, 'Moorman', 'D', '1970-05-10', 'F', 1984, 'Stout Street','65', '9437AO', 'Eltham'
, '079-987571', '7060');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PLAYERS VALUES (112, 'Bailey', 'IP', '1963-10-01', 'F', 1984, 'Vixen Road','8', '6392LK', 'Plymouth',
 '010-548745', '1319');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql>
mysql> SELECT PLAYERNO,
    -> CASE SEX
    -> WHEN 'F' THEN 'Female' END AS FEMALES,
    -> NAME
    -> FROM PLAYERS
    -> WHERE JOINED > 1980;
+----------+---------+---------+
| PLAYERNO | FEMALES | NAME    |
+----------+---------+---------+
|        7 | NULL    | Wise    |
|       27 | Female  | Collins |
|       28 | Female  | Collins |
|       57 | NULL    | Brown   |
|       83 | NULL    | Hope    |
|      104 | Female  | Moorman |
|      112 | Female  | Bailey  |
+----------+---------+---------+
7 rows in set (0.00 sec)

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

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If ELSE is omitted, the null value is returned. : CASE « Function « SQL / MySQL

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