MySQL :: MySQL 5.1 with Maria Reference Manual :: 1.7.5 MySQL Differences from Standard SQL

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We try to make MySQL Server follow the ANSI SQL standard and the ODBC SQL standard, but MySQL Server performs operations differently in some cases:

There are several differences between the MySQL and standard SQL privilege systems. For example, in MySQL, privileges for a table are not automatically revoked when you delete a table. You must explicitly issue a REVOKE statement to revoke privileges for a table. For more information, see Section 12.5.1.5, “REVOKE Syntax”.
The CAST() function does not support cast to REAL or BIGINT. See Section 11.9, “Cast Functions and Operators”.

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