Oracle: Select and Update at the same time - sql

Question

I have three tables:
Table-1: Column1 | Column2 | Column 3
Table-2: Column4 | Column5 | ColumnUpdate
Table-3: Column7 | Column8
I need to copy some rows from Table-2 to Table-3 based on some conditions with Table-1:
My insert-statement looks like this:
INSERT INTO Table-3 (
Column7,
Column8)
SELECT Table-2.COLUMN4, Table-2.COLUMN5
FROM Table-2 INNER JOIN Table-1
ON Table-2.COLUMN4 = TABLE-1.Column1;
However I want to update column: ColumnUpdate" (Table-2) of the selecting row to "1".
So I select some rows and immediately want to update a process column in that row as '1'.
I don't know how to do that. I saw some examples with "OUTPUT" clause or "UPDATE FOR" but I dont exactly know how to use them in my statement.

Answer 1

MERGE
INTO target_table t1
USING (SELECT col1, col2
FROM source_table
WHERE //conditions here) s1
ON (t1.id = s1.id)
WHEN MATCHED THEN
UPDATE SET column_update = '1'
WHEN NOT MATCHED THEN
INSERT (col1, col2)
VALUES (s1.col1, s1.col2)
WHERE (// condition here);
UPDATE
BEGIN
FOR temp_var IN (
SELECT * from table_a
WHERE table_a.col1 = table_b.col1)
LOOP
// INSERTING INTO TARGET TABLE
INSERT INTO table_b
VALUES(temp_var.col1, temp_var.col2);
// UPDATING SOURCE TABLE
UPDATE table_a
SET status = 'COPIED'
WHERE col1 = temp_var.col1;
END LOOP;
END;