Insert Code
$tid = $_POST['tid'];
$test = $_POST['test'];


// please remove last ' , (coma)' from fileds

mysqli_query($conn,"INSERT INTO `ajith` ( `tid`,`test`, ) VALUES ('$tid','$test',)");
Select Single
$getdata = mysqli_query($conn,"SELECT * FROM ajith ");
$row = mysqli_fetch_array($getdata);
$tid = $row['tid'];
$test = $row['test'];
Select While
$getdata = mysqli_query($conn,"SELECT * FROM ajith ");
while($row = mysqli_fetch_array($getdata)) {
$tid = $row['tid'];
$test = $row['test'];
}
Delete Code
$getid = $_GET['id'];
mysqli_query($conn,"DELETE FROM ajith WHERE tid ='$id' ");
Update Single Code
$tid = $_POST['tid'];
$test = $_POST['test'];

mysqli_query($conn,"UPDATE `ajith` SET `tid` = '$tid' WHERE `ajith`.`tid` = 1")
mysqli_query($conn,"UPDATE `ajith` SET `test` = '$test' WHERE `ajith`.`tid` = 1")