Is it possible to shorten this query - sql

Question

we have used loop for read between timestamps. This works but this way exhausting for server with million records.
The timestamps are determined by the $resolution variable and assigned to a new array. But we know this is poor way. I think we can do that without while. Maybe one query enough.
Route::get('/history', function (Request $request) {
//return response()->json([]);
$symbol = explode("-", $request->get("symbol"));
$coin = Coin::where("symbol", $symbol[1])->first();
$currency = Coin::where("symbol", $symbol[0])->first();
$resolution = $request->get("resolution");
$from = $request->get("from");
$to = $request->get("to");
$uniqueKey = sprintf("OHLCKEY%s%s%s%s",
$symbol[0], $symbol[1],
Carbon::createFromTimestamp($from)->second(0)->timestamp,
Carbon::createFromTimestamp($to)->second(0)->timestamp);
$redis=Redis::connection();
$cache = $redis->get($uniqueKey);
if($cache) {
$data = json_decode($cache);
return response()->json($data);
} else {
$t = [];
$o = [];
$h = [];
$l = [];
$c = [];
$v = [];
$s = "no_data";
$minMaxDates = TransactionDetail::where("type", "buy")
->whereBetween("created_at", [
Carbon::createFromTimestamp($from),
Carbon::createFromTimestamp($to)
])->where("coin_id", $coin->id)->where("currency_id", $currency->id)
->selectRaw("min(created_at) as minDate, max(created_at) as maxDate")->first();
if($minMaxDates->minDate) {
$minDate = Carbon::createFromTimeString($minMaxDates->minDate)->timestamp;
if($from < $minDate) {
$startDate = $minDate;
} else {
$startDate = (int)$from;
}
$maxDate = Carbon::createFromTimeString($minMaxDates->maxDate)->timestamp;
if($to > $maxDate) {
$to = $maxDate;
}
while ($startDate < $to):
switch ($resolution) {
case "30";
$endDate = Carbon::createFromTimestamp($startDate)->addMinutes(30)->timestamp;
break;
case "60";
$endDate = Carbon::createFromTimestamp($startDate)->addHour(1)->timestamp;
break;
case "180";
$endDate = Carbon::createFromTimestamp($startDate)->addHour(3)->timestamp;
break;
case "360";
$endDate = Carbon::createFromTimestamp($startDate)->addHour(6)->timestamp;
break;
case "720";
$endDate = Carbon::createFromTimestamp($startDate)->addHour(12)->timestamp;
break;
default:
$endDate = Carbon::createFromTimestamp($startDate)->addHour(1)->timestamp;
break;
}
if ($endDate > $to) $endDate = $to;
$transactions = TransactionDetail::where("type", "buy")
->whereBetween("created_at", [
Carbon::createFromTimestamp($startDate),
Carbon::createFromTimestamp($endDate)
])->where("coin_id", $coin->id)->where("currency_id", $currency->id)->get();
if (!$transactions->isEmpty()) {
$t[] = $transactions->first()->created_at->timestamp;
$o[] = floatval($transactions->first()->price);
$h[] = floatval($transactions->max("price"));
$l[] = floatval($transactions->min("price"));
$c[] = floatval($transactions->last()->price);
$v[] = floatval($transactions->sum("amount"));
}
$startDate = $endDate + 1;
endwhile;
}
if (!empty($t)) $s = "ok";
$data = ["t" => $t, "o" => $o, "h" => $h, "l" => $l, "c" => $c, "v" => $v, "s" => $s];
$redis->set($uniqueKey, json_encode($data));
return response()->json($data);
}
});
Can we reproduce this code with one mysql query?
thank you in advance.