Laravel's database query builder provides a convenient, fluent interface to creating and running database queries.
- It uses PDO parameter binding to protect your application against SQL injection. There is no need to clean strings passed as bindings.
Joins
To perform a basic "
inner join", you may use the
join() method on a query builder instance.
The first argument is the name of the table you need to join to; the remaining arguments specify the relation of the columns for the join.
- You can join to multiple tables in a single query:
$users = DB::table('users')
->join('contacts', 'users.id', '=', 'contacts.user_id')
->join('orders', 'users.id', '=', 'orders.user_id')
->select('users.*', 'contacts.email', 'orders.price')
->get();
- To perform a "
left join" query, use the
leftJoin() method, in the same way as the
join() method.
$users = DB::table('users')
->leftJoin('posts', 'users.id', '=', 'posts.user_id')
->get();
Unions
To "
union" two queries together, create an initial query and use the
union() method to union it with a second query.
$first = DB::table('users')->whereNull('first_name');
$users = DB::table('users')->whereNull('last_name')
->union($first)->get();
- Documentation:
Laravel - Database: Query Builder
Daily Test with Code Example
HTML
CSS
JavaScript
PHP-MySQL
What attribute makes a radio button or checkbox input selected?
checked="checked" selected="selected" disabled="disabled"<input type="checkbox" name="a_name" value="value" checked="checked" />
What CSS value scales the background image to the largest size contained within the element?
repeat-x contain linear-gradient#id {
background:url("path_to_image.png");
background-size:contain;
background-repeat:no-repeat;
}
What operator is used to determine the rest of the division of two numbers?
% * /var rest8_7 = 8 % 7;
alert(rest8_7);
Indicate the PHP function that rounds a number up to the next highest integer.
floor() ceil() abs()$nr = ceil(3.5);
echo $nr; // 4