Sql

SELECT *
FROM A
FULL JOIN B ON A.key = B.key
WHERE A.key IS NULL
OR B.key IS NULL

SELECT *
FROM A
LEFT JOIN B ON A.key = B.key
WHERE B.key IS NULL

SELECT *
FROM A
INNER JOIN B ON A.key = B.key

SELECT *
FROM A
LEFT JOIN B ON A.key = B.key

SELECT *
FROM A
RIGHT JOIN B ON A.key = B.key

SELECT *
FROM A
RIGHT JOIN B ON A.key = B.key
WHERE B.key IS NULL

SELECT *
FROM A
FULL JOIN B ON A.key = B.key

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