Using method and de duplication of distinct() in laravel

This paper

laravel in distinct( ) How to use and de duplication , MySQL Usually use GROUPBY ( It is essentially a sort action ) complete DISTINCT operation , If DISTINCT Operation and ORDERBY Operation combination use , Temporary tables are often used , This will affect performance , In some cases , MySQL You can use index optimization DISTINCT operation , But it needs to be learned and used flexibly .

One 、laravel5 How do you use it? distinct

laravel5 Use distinct It's simple , The official has offered to use distinct Method allows you to force a lookup to return a non repeating result ：

$users = DB::table('users')->distinct()->get();

However, the code provided by the government cannot find and return non repeated results , We need to specify the following fields ：

$users=DB::table('users')->select('name')->distinct()->get();

Two 、 how select Multiple fields

If you want to distinct Multiple fields , Can be in select Add field name to ;
But be careful , When select Multiple fields , Representative needs status And name All the same will be excluded .

$users=DB::table('users')->select('status','name')->distinct()->get();

This is it. laravel in distinct A summary of the methods used , If you want to retrieve data from a database , have access to GROUPBY Method .