MySQL祝辞汇总成一个查询(包括谷歌地图)

这个问题是@Vincent Savard对我的一个问题的评论的后续。

目前，我正在尝试(有一些成功- 60秒后命中超时，谷歌地图的XML请求)将数据从一个(相当)大的表分割成许多小的表-加上转换/修改/等他们在飞行。对于这个任务，我使用php接近以下示例:

// The following happens inside some functions.
// The main table has some "groups" of content.
// fn_a creates the new small tables
"
CREATE TABLE {$small_table_a}
    col_group_a_id int UNSIGNED NOT NULL AUTO_INCREMENT,
    col_group_a_fname tinytext,
    col_group_a_lname tinytext,
    col_group_a_valA tinytext,
    col_group_a_valB tinytext,
    col_group_a_address tinytext,
    col_group_a_lat decimal(9,3),
    col_group_a_lng decimal(9,3),
    PRIMARY KEY  (id)
"
"
CREATE TABLE {$small_table_b}
    col_group_b_id int UNSIGNED NOT NULL AUTO_INCREMENT,
    col_group_b_fname tinytext,
    col_group_b_lname tinytext,
    col_group_b_valA tinytext,
    col_group_b_valB tinytext,
    col_group_b_address tinytext,
    col_group_b_lat decimal(9,3),
    col_group_b_lng decimal(9,3),
    PRIMARY KEY  (id)
"
// fn_b loads the content from the big table, modifies it and saves it row per row into the small tables
$sql = "
SELECT *
FROM {$big_table}
"
foreach ( $sql as $data )
{
    $id = $data->id;
    $group_a_fname = $data->group_a_fname;
    $group_a_lname = $data->group_a_lname;
    $group_a_lname = "{$group_a_fname}, {$group_a_lname}";
    $group_a_valA = $data->group_a_valA ? $data->group_a_valA : '-';
    $group_a_valA = $data->group_a_valB ? $data->group_a_valB : 'none';
    $group_a_valA = $data->group_a_address;
    $group_b_fname = $data->group_b_fname;
    $group_b_lname = $data->group_b_lname;
    $group_b_name = "{$group_b_fname}, {$group_b_lname}";
    $group_b_valA = $data->group_b_valA ? $data->group_b_valA : '/';
    $group_b_valA = $data->group_b_valB ? "€ {$data->group_b_valB}" : null;
    "
    INSERT INTO {$small_table_a} ... VALUES ...
    "
}
// fn_c pulls in data from the small tables, asks the google map API for lat & lng and _should_ update the small table
$sql = "
SELECT *
FROM {$small_table_a}
"
foreach ( $sql as $data )
{
    $output['id'] = $data->id;
    $address = urlencode( $data->address );
    $url = "http://maps.google.com/maps/api/geocode/xml?address={$address}&sensor=false";
    $content = file_get_contents( $url );
    $file_data = new SimpleXMLElement( $content );
    $file_data = $file_data->result ? $file_data->result : null;
    if ( ! $file_data ) 
        continue;
    $location = $file_data->geometry->location;
    $output['lat'] = (string) $location->lat;
    $output['lng'] = (string) $location->lng;
}
foreach ( $output as $data )
{
    "
    UPDATE {$table}
    SET lat=SET lat={$data['lat']}, lng={$data['lng']}
    WHERE id=$data['id']
}

问题:我如何在一个查询中做到这一点?或者如何减少db查询?当我的地理编码超过了今天的限制时，我如何在不中断查询构建的情况下将lat/lng添加到表中?我不想因为超过了限制而放弃所有内容。

谢谢!

注意:这个例子是我直接用手写的。