create a new column in a table sql code example

Example 1: sql add column

ALTER TABLE Customers
ADD Email varchar(255);

Example 2: add column to table sql

ALTER TABLE table_name ADD column_name varchar(50);

Example 3: create column sql

ALTER TABLE table_name
ADD column_name datatype;

Example 4: how to make new column in sql

<?php
 
    echo str_replace("john", "jack", "hello i am john"); 
 
?>