mysql - laravel，groupby()中的子字符串

Question

我会按 orderBy 对选定的列进行分组，而没有来自 cars.name 的最后 3 个字符。

$objects_collection = $objects_collection
        ->groupBy("cars.name", "parts.part_catalog_id", "parts.colour_id")
        ->select($this->getProperTableName(str_plural($this->getRoute())) . ".*", DB::raw("count(*) as quantity"))
        ->paginate($paginate);

我应该怎么做？

编辑:

解决方案是:

$objects_collection = $objects_collection
        ->groupBy(DB::raw("SUBSTRING_INDEX(cars.name, '/', 1)"), "parts.part_catalog_id", "parts.colour_id")
        ->select($this->getProperTableName(str_plural($this->getRoute())) . ".*", DB::raw("count(*) as quantity"))
        ->paginate($paginate);

Answer 1

如果您使用的是 MySQL，您可以尝试一下:

$objects_collection = $objects_collection
    ->groupBy("cars.name", "parts.part_catalog_id", "parts.colour_id")
    ->select(DB::raw('SUBSTR(`cars.name`, 1, (LENGTH(`cars.name`)-3))'), $this->getProperTableName(str_plural($this->getRoute())) . ".*", DB::raw("count(*) as quantity"))
    ->orderByRaw('1')'
    ->paginate($paginate);

正如您所说，您想要orderBy。