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change of type from Oracle to MariaDB/MySQL

Last Modified: 2018-11-06

as we found data type after convert from Oracle to MariaDB there are diff, I'd like to know:

1) does MySQL/MariaDB has DATE only type ? Why MariaDB use datetime? MariaDB only has datatime?
2)  Why varchar2(75) become TEXT
3) why varchar2(100) become TEXT

any information about what is the space occupied by both type ?
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