To include a quote character within a string that is quoted by the same kind of quote,
mysql>
mysql> SELECT 'I''m asleep', 'I\'m wide awake';
+------------+----------------+
| I'm asleep | I'm wide awake |
+------------+----------------+
| I'm asleep | I'm wide awake |
+------------+----------------+
1 row in set (0.00 sec)
mysql>
mysql> SELECT "He said, ""Boo!""", "And I said, \"Yikes!\"";
+-----------------+----------------------+
| He said, "Boo!" | And I said, "Yikes!" |
+-----------------+----------------------+
| He said, "Boo!" | And I said, "Yikes!" |
+-----------------+----------------------+
1 row in set (0.00 sec)
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