What is the difference between using INSERT, UPDATE, and REPLACE statements in PHP for database operations?

When performing database operations in PHP, the main difference between using INSERT, UPDATE, and REPLACE statements lies in their functionality. - INSERT statement is used to add new records to a database table. - UPDATE statement is used to modify existing records in a database table. - REPLACE statement is used to either insert a new record or update an existing record in a database table based on a unique key constraint. Here is a PHP code snippet that demonstrates the use of INSERT, UPDATE, and REPLACE statements: 

// INSERT statement
$sql = "INSERT INTO users (name, email) VALUES ('John Doe', 'john.doe@example.com')";
$result = mysqli_query($conn, $sql);

// UPDATE statement
$sql = "UPDATE users SET email = 'johndoe@example.com' WHERE name = 'John Doe'";
$result = mysqli_query($conn, $sql);

// REPLACE statement
$sql = "REPLACE INTO users (id, name, email) VALUES (1, 'Jane Doe', 'jane.doe@example.com')";
$result = mysqli_query($conn, $sql);

Keywords

INSERT UPDATE REPLACE statements PHP

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