Join operations in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a basic inner join between 'users' and 'posts' tables.

Laravel

$users = DB::table('users')
    ->[1]('posts', 'users.id', '=', 'posts.user_id')
    ->get();

Drag options to blanks, or click blank then click option'

Ajoin

Bselect

Cwhere

DgroupBy

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'select' instead of 'join' will only choose columns, not combine tables.

Using 'where' will filter rows but not join tables.

The join method performs an inner join between tables.

2fill in blank

medium

Complete the code to perform a left join between 'users' and 'profiles' tables.

Laravel

$users = DB::table('users')
    ->[1]('profiles', 'users.id', '=', 'profiles.user_id')
    ->get();

Drag options to blanks, or click blank then click option'

Ajoin

BcrossJoin

CrightJoin

DleftJoin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'join' will exclude users without profiles.

Using 'rightJoin' will include all profiles but not all users.

The leftJoin method returns all records from the left table and matched records from the right table.

3fill in blank

hard

Fix the error in the join condition to correctly join 'orders' and 'customers' tables.

Laravel

$orders = DB::table('orders')
    ->join('customers', 'orders.customer_id', [1], 'customers.id')
    ->get();

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A==

B=

C===

D=>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' or '===' causes syntax errors in join conditions.

Using '=>' is for arrays, not join conditions.

The join condition uses a single equals sign '=' to compare columns.

4fill in blank

hard

Fill both blanks to perform a right join between 'products' and 'categories' tables with correct join condition.

Laravel

$products = DB::table('products')
    ->[1]('categories', 'products.category_id', [2], 'categories.id')
    ->get();

Drag options to blanks, or click blank then click option'

ArightJoin

BleftJoin

C=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'leftJoin' instead of 'rightJoin' changes the join direction.

Using '==' instead of '=' causes errors.

The rightJoin method is used for right joins, and '=' is the correct operator for join conditions.

5fill in blank

hard

Fill all three blanks to create a join with an additional where clause filtering 'status' in 'tasks' table.

Laravel

$tasks = DB::table('tasks')
    ->[1]('users', 'tasks.user_id', [2], 'users.id')
    ->where('tasks.status', [3])
    ->get();

Drag options to blanks, or click blank then click option'

Ajoin

B=

C'completed'

DleftJoin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'leftJoin' changes the join type.

Using wrong operator in join condition causes errors.

Forgetting quotes around 'completed' causes syntax errors.

The code uses join with '=' for the join condition and filters tasks with status 'completed'.