[Scenario]

I have this piece of code:

pawn Код:

stock DoesEmailAddressExist(const emailaddress[])
{
    new szQuery[300], iReturnVal;
    format(szQuery, sizeof(szQuery), "SELECT `Email Address` FROM `Accounts` WHERE `Email Address` = '%s'", emailaddress);
    mysql_query(szQuery);
    
    mysql_store_result();
    if(mysql_num_rows() > 0)
    {
        mysql_free_result();
        iReturnVal = 1;
    }
    else if(mysql_num_rows() == 0)
    {
        mysql_free_result();
        iReturnVal = 0;
    }
    return iReturnVal;
}

When players register on my server, their email address is stored. When new players register, I don't want them using the same email address. Therefore, this function is there to check if the email address is already saved in the DB. Now, my question is; Is the query used in this function the most efficient way to determine if the address exists, or is there an actual syntax for this?