Kuidas teha FULL JOIN operatsiooni, kasutades ainult standardseid SQL-päringuid ilma otsese operaatorita?

The FULL JOIN operation can be emulated by combining the results of LEFT JOIN and RIGHT JOIN using UNION, excluding duplicate rows.

SQL example:

SELECT a.*, b.*
FROM tableA a
LEFT JOIN tableB b ON a.id = b.id
UNION
SELECT a.*, b.*
FROM tableA a
RIGHT JOIN tableB b ON a.id = b.id;

This query will combine all rows from both tables, matching them according to the join condition, and will include rows that do not have a match in the other table.