Check out example codes for "oracle insert into". It will help you in understanding the concepts better.

Code Example 1

INSERT INTO table
(column1, column2, ... column_n )
SELECT expression1, expression2, ... expression_n
FROM source_table
[WHERE conditions];

Code Example 2

INSERT INTO table
(column1, column2, ... column_n )
VALUES
(expression1, expression2, ... expression_n );

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