alter query in oracle code example

Example 1: oracle add column

ALTER TABLE table_name 
ADD column_name data_type constraint;

Example 2: alter table oracle

ALTER TABLE tablename MODIFY columnname varchar2(100)

Example 3: update table syntax in oracle

{
    UPDATE table-Name [[AS] correlation-Name]
        SET column-Name = Value
        [ , column-Name = Value} ]*
        [WHERE clause] |
    UPDATE table-Name
        SET column-Name = Value
        [ , column-Name = Value ]*
        WHERE CURRENT OF
}