Question

选择DISTINCT i.filename“文件名”，p.ips_acknow_id“ ISP确认ID” 来自isp_acknows i左联接pdfreads p ON i.id = p.ips_acknow_id

我也可以通过联接来做到这一点，但是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'） ->选择（'isp_acknows.filename'，'isp_acknows.id'，'isp_acknows.filedisplayname'，'isp_acknows.fileversion'， 'isp_acknows.privilege'，'isp_acknows.remarks'）-> where（'pdfreads.user_id'，$ id） -> paginate（1000）;

如何在查询Laravel 7中做到这一点？

1 个答案: