MySQL :: MySQL 3.23, 4.0, 4.1 Reference Manual :: 1.9.5 MySQL Differences from Standard SQL

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:

For VARCHAR columns, trailing spaces are removed when the value is stored. See Section A.5.8, “Known Issues in MySQL”.
In some cases, CHAR columns are silently converted to VARCHAR columns when you define a table or alter its structure. See Section 12.1.5.1, “Silent Column Specification Changes”.
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 12.4.1.3, “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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