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/*!40100 DEFAULT CHARACTER SET latin1 */
Why is it between comment marks?
What is the 40100 all about?
What is the ! for?
What does it do?
Where is the documentation for this?
It’s a conditional comment that can be interpreted by MySQL
The code 40100 means only these versions of MySQL>=4.1.0 (4.01.00) will interpret the conditional comment.
The
!is here to force MySQL to parse the code between the/* ... */It sets the value of the parameter DEFAULT CHARACTER = ‘latin1’ so that the data in an SQL dump can be intepreted correctly during import. It doesn’t affect the database structure, but merely helps the export/import process to work right.
http://dev.mysql.com/doc/refman/4.1/en/comments.html