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PHP Quiz PHP CertificatePHP MySQL The Where Clause
The WHERE clause is used to filter records.
The WHERE clause
The WHERE clause is used to extract only those records that fulfill a specified criterion.
Syntax
SELECT column_name(s)
FROM table_name
WHERE column_name operator value
FROM table_name
WHERE column_name operator value
To learn more about SQL, please visit our SQL tutorial.
To get PHP to execute the statement above we must use the mysqli_query() function. This function is used to send a query or command to a MySQL connection.
Example
The following example selects all rows from the "Persons" table where "FirstName='Peter'":
<?php
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");
while($row = mysqli_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br>";
}
?>
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");
while($row = mysqli_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br>";
}
?>
The output of the code above will be:
Peter Griffin
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