-- Migrated from DuckDB test: test/sql/setops/test_setops.test
SELECT 1 UNION ALL SELECT 2 ORDER BY 1;

+----------+
| Int64(1) |
+----------+
| 1        |
| 2        |
+----------+

SELECT 1, 'a' UNION ALL SELECT 2, 'b' ORDER BY 1;

+----------+-----------+
| Int64(1) | Utf8("a") |
+----------+-----------+
| 1        | a         |
| 2        | b         |
+----------+-----------+

SELECT 1, 'a' UNION ALL SELECT 2, 'b' UNION ALL SELECT 3, 'c' ORDER BY 1;

+----------+-----------+
| Int64(1) | Utf8("a") |
+----------+-----------+
| 1        | a         |
| 2        | b         |
| 3        | c         |
+----------+-----------+

SELECT 1, 'a' UNION ALL SELECT 2, 'b' UNION ALL SELECT 3, 'c' UNION ALL SELECT 4, 'd' ORDER BY 1;

+----------+-----------+
| Int64(1) | Utf8("a") |
+----------+-----------+
| 1        | a         |
| 2        | b         |
| 3        | c         |
| 4        | d         |
+----------+-----------+

-- NULL values
SELECT NULL UNION SELECT NULL;

+------+
| NULL |
+------+
|      |
+------+

SELECT NULL EXCEPT SELECT NULL;

++
++

SELECT NULL INTERSECT SELECT NULL;

+------+
| NULL |
+------+
|      |
+------+

CREATE TABLE test (a INTEGER, b INTEGER, ts TIMESTAMP TIME INDEX);

Affected Rows: 0

INSERT INTO test VALUES (11, 1, 1000), (12, 1, 2000), (13, 2, 3000);

Affected Rows: 3

-- Table data
SELECT a FROM test WHERE a < 13 UNION ALL SELECT a FROM test WHERE a = 13 ORDER BY a;

+----+
| a  |
+----+
| 11 |
| 12 |
| 13 |
+----+

SELECT b FROM test WHERE a < 13 UNION ALL SELECT b FROM test WHERE a > 11 ORDER BY b;

+---+
| b |
+---+
| 1 |
| 1 |
| 1 |
| 2 |
+---+

-- Type mixing
SELECT 1 UNION ALL SELECT 'asdf';

+----------+
| Int64(1) |
+----------+
| 1        |
| asdf     |
+----------+

-- UNION deduplication
SELECT 1 UNION SELECT 1;

+----------+
| Int64(1) |
+----------+
| 1        |
+----------+

SELECT 1 EXCEPT SELECT 2;

+----------+
| Int64(1) |
+----------+
| 1        |
+----------+

SELECT 1 EXCEPT SELECT 1;

++
++

SELECT 1 INTERSECT SELECT 1;

+----------+
| Int64(1) |
+----------+
| 1        |
+----------+

SELECT 1 INTERSECT SELECT 2;

++
++

DROP TABLE test;

Affected Rows: 0