Select unique values from the same column in two tables

Question

I'm just playing with SQL and want to achieve the following result I have the following tables:

TABLE_1   ID   NAME
          1    CAR
          2    ANIMAL
          5    ROCK

TABLE_2   ID   NAME
          1    GRASS
          2    ROCKET
          3    STONE
          4    DOG

I want my query to return unique ID values from both tables:

ID
3
4
5

I have tried using DISTINCT and FULL OUTER JOINS, but without success. Any help would be appreciated.

Answer 1

You can use UNION ALL , group it and use the HAVING clause :

SELECT ID FROM (
    SELECT ID FROM Table_1
    UNION ALL
    SELECT ID FROM Table_2)
GROUP BY ID
HAVING COUNT(*) = 1

Answer 2

Try this:

SELECT ID
FROM (
  SELECT ID
  FROM TABLE_1

  UNION ALL

  SELECT ID
  FROM TABLE_2) AS t
GROUP BY ID
HAVING COUNT(*) = 1

Answer 3

Try this;)

SELECT ID
FROM(
  SELECT DISTINCT ID FROM TABLE1
  UNION ALL
  SELECT DISTINCT ID FROM TABLE2
) T
GROUP BY ID
HAVING COUNT(ID) = 1

SQLFiddle DEMO

Answer 4

SELECT id FROM table_1 WHERE id NOT IN (SELECT id FROM table_2)
UNION
SELECT id FROM table_2 WHERE id NOT IN (SELECT id FROM table_1)

Answer 5

Construct the intersection manually using UNION. It's easy if you have some unique field in both tables, eg ID:

SELECT id FROM Table 1
WHERE id NOT IN (SELECT id FROM Table 2)

UNION

SELECT id FROM Table 2
WHERE id NOT IN (SELECT id FROM Table 1)

Answer 6

SELECT table_1.id
FROM   table_1
WHERE  table_1.id NOT IN (SELECT table_2.id FROM table_2)
UNION
SELECT table_2.id
FROM   table_2
WHERE  table_2.id NOT IN (SELECT table_1.id FROM table_1)