alter table in oracle code example

Example 1: create table oracle

CREATE TABLE ot.persons(
    person_id NUMBER GENERATED BY DEFAULT AS IDENTITY,
    first_name VARCHAR2(50) NOT NULL,
    last_name VARCHAR2(50) NOT NULL,
    PRIMARY KEY(person_id)
);

Example 2: alter table oracle

ALTER TABLE tablename MODIFY columnname varchar2(100)

Example 3: PL SQL MODIFY COLUMN NME

ALTER TABLE table_name
  RENAME COLUMN old_name TO new_name;

Example 4: 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
}

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Sql Example

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