The following comparison produces a result that is correct in lexical terms but incorrect in temporal terms
mysql>
mysql>
mysql> SELECT RIGHT('1987-7-1',5) < RIGHT('1987-10-01',5);
+---------------------------------------------+
| RIGHT('1987-7-1',5) < RIGHT('1987-10-01',5) |
+---------------------------------------------+
| 0 |
+---------------------------------------------+
1 row in set (0.00 sec)
mysql>
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