What are the differences between INSERT and UPDATE statements in PHP, and when should each be used?

INSERT and UPDATE statements in PHP are used to add new records to a database table and update existing records, respectively. INSERT is used when you want to add a new record to a table, while UPDATE is used when you want to modify existing records. INSERT creates a new row in the table, while UPDATE modifies an existing row based on specified conditions. Example PHP code snippet for INSERT statement: 

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

$sql = "INSERT INTO users (firstname, lastname, email) VALUES ('John', 'Doe', 'john.doe@example.com')";

if ($conn->query($sql) === TRUE) {
  echo "New record created successfully";
} else {
  echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>
```

Example PHP code snippet for UPDATE statement:
```php
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

$sql = "UPDATE users SET email='johndoe@example.com' WHERE id=1";

if ($conn->query($sql) === TRUE) {
  echo "Record updated successfully";
} else {
  echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

Keywords

INSERT UPDATE statements PHP differences

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