how to create columns in sql code example

Example 1: sqlserver add column to table

ALTER TABLE dbo.doc_exa 
ADD column_b VARCHAR(20) NULL, 
	column_c INT NULL ;

Example 2: create column sql

ALTER TABLE table_name
ADD column_name datatype;

Example 3: how to make new column in sql

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

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