Ordering and grouping in Laravel - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the orderBy method do in Laravel's Eloquent?

The orderBy method sorts the query results by a specified column in ascending or descending order.

beginner

How do you group query results by a column using Laravel's query builder?

You use the groupBy method to group results by one or more columns, which is useful for aggregate functions.

intermediate

What is the difference between orderBy and groupBy in Laravel?

orderBy sorts the rows in a specific order, while groupBy groups rows that share the same value in specified columns.

intermediate

How can you order grouped results by an aggregate value in Laravel?

You can use groupBy to group the data, then use selectRaw with an aggregate function like COUNT(), and finally orderBy on that aggregate column.

beginner

Show a simple example of grouping users by their role and ordering by the count of users per role in Laravel.

Example:<br>DB::table('users')<br>->select('role', DB::raw('count(*) as total'))<br>->groupBy('role')<br>->orderBy('total', 'desc')<br>->get();

Which Laravel method is used to sort query results?

A orderBy

B groupBy

C select

D where

orderBy sorts the query results by a specified column.

What does groupBy do in a Laravel query?

A Sorts rows alphabetically

B Groups rows sharing the same column value

C Filters rows by a condition

D Joins two tables

groupBy groups rows that have the same value in specified columns.

How do you order grouped results by the count of items in Laravel?

A Use <code>where</code> with count

B Use <code>groupBy</code> twice

C Use <code>orderBy</code> on the aggregate count column

D Use <code>select</code> only

You order by the aggregate count column after grouping.

Which method allows raw expressions like COUNT() in Laravel queries?

A selectRaw

B orderByRaw

C groupByRaw

D whereRaw

selectRaw lets you write raw SQL expressions like COUNT().

What will this Laravel query do?<br>DB::table('users')->groupBy('role')->get();

A Return all users sorted by role

B Return users filtered by role

C Return an error because no aggregate is used

D Return users grouped by role without aggregates

It groups users by role but without aggregates, so it returns grouped rows.

Explain how to use orderBy and groupBy together in a Laravel query.

Think about grouping first, then sorting the grouped results.

Describe a real-life example where grouping and ordering data in Laravel would be useful.

Imagine sorting a list of employees by department size.