MySQL Reference Manual :: 1.7.5 MySQL Differences from Standard SQL

For VARCHAR columns, trailing spaces are removed when the value is stored. (Fixed in MySQL 5.0.3). See Section A.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. (Fixed in MySQL 5.0.3). See Section 13.1.5.1, “Silent Column Specification Changes”.

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. See Section 13.5.1.3, “GRANT and REVOKE Syntax”.

The CAST() function does not support cast to REAL or BIGINT. See Section 12.8, “Cast Functions and Operators”.

Standard SQL requires that a HAVING clause in a SELECT statement be able to refer to columns in the GROUP BY clause. This cannot be done before MySQL 5.0.2.