What's the best schema to choose for a todo date?

What's the best schema to choose for a todo date?

References

Reference NO 1

http://c2.com/cgi/wiki?DatabaseBestPractices

Reference NO 2

http://www.oracle.com/technetwork/articles/sql/11g-schemamanagement-089869.html

Reference NO 3

http://net.tutsplus.com/tutorials/other/top-20-mysql-best-practices/

Reference NO 4

http://www.stylusstudio.com/xml_schema_tutorial.html

Reference NO 5

https://www.simple-talk.com/sql/t-sql-programming/exploring-your-database-schema-with-sql/

Reference NO 6

http://www.red-gate.com/products/sql-development/sql-compare/

Reference NO 7

http://stackoverflow.com/questions/2119859/questions-every-good-database-sql-developer-should-be-able-to-answer

Reference NO 8

http://moz.com/ugc/getting-the-most-out-of-schemaorg-microformats