Bagaimanakah fungsi perbandingan IN() berfungsi dalam MySQL?

Expression IN (val1, val2,…,valN)

mysql> Select 100 IN (50,100,200,400,2000);
+------------------------------+
| 100 IN (50,100,200,400,2000) |
+------------------------------+
|                            1 |
+------------------------------+
1 row in set (0.00 sec)

mysql> Select 1000 IN (50,100,200,400,2000);
+-------------------------------+
| 1000 IN (50,100,200,400,2000) |
+-------------------------------+
|                             0 |
+-------------------------------+
1 row in set (0.00 sec)

mysql> Select 'ABC' IN ('ABCD','ABCDE','ABC');
+---------------------------------+
| 'ABC' IN ('ABCD','ABCDE','ABC') |
+---------------------------------+
|                               1 |
+---------------------------------+
1 row in set (0.01 sec)

mysql> Select 'ABC' IN ('ABCD','ABCDE','ABCDEF');
+------------------------------------+
| 'ABC' IN ('ABCD','ABCDE','ABCDEF') |
+------------------------------------+
|                                  0 |
+------------------------------------+
1 row in set (0.00 sec)