如何在查询 Laravel 7 中执行此操作？

Question

选择 DISTINCT i.filename "文件名", p.ips_acknow_id "ISP 确认 ID" from isp_acknows i LEFT JOIN pdfreads p ON i.id = p.ips_acknow_id

我也可以通过连接来做到这一点，但我需要这种格式来提高性能。

Note:
1. isp_acknows table
        Schema::create('isp_acknows', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->unsignedInteger('user_id');
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->string('filename')->nullable();
            $table->string('filedisplayname')->nullable();
            $table->string('privilege')->nullable();
            $table->string('fileversion')->nullable();
            $table->string('remarks')->nullable();
            $table->softDeletes();
        });

2. pdfreads Table

        Schema::create('pdfreads', function (Blueprint $table) {
            $table->id();
            $table->unsignedInteger('user_id');
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->unsignedInteger('ips_acknow_id');
            $table->unique(['user_id','ips_acknow_id']);
            $table->timestamps();

Answer 1

DB::table('isp_acknows') ->join('pdfreads', 'isp_acknows.id', '=', 'pdfreads.isp_acknow_id') ->select('isp_acknows.filename', 'isp_acknows.id', 'isp_acknows.filedisplayname', 'isp_acknows.fileversion', 'isp_acknows.privilege', 'isp_acknows.remarks')->where('pdfreads.user_id',$id) ->分页（1000）；