# name: test/sql/pivot/test_unpivot_stmt.test
# description: Test unpivot of the stack-overflow example - https://stackoverflow.com/questions/72922418/create-rows-from-part-of-column-names/72939299
# group: [pivot]

statement ok
PRAGMA enable_verification

statement ok
CREATE TABLE t1(id BIGINT, "Sales (05/19/2020)" BIGINT, "Sales (06/03/2020)" BIGINT, "Sales (10/23/2020)" BIGINT);

statement ok
INSERT INTO t1 VALUES(10629465, 23, 47, 99);

statement ok
INSERT INTO t1 VALUES(98765432, 10, 99, 33);

# SQL standard syntax
query III
SELECT id, regexp_replace(date, 'Sales [(]([0-9]+)/([0-9]+)/([0-9]+)[)]', '\3-\1-\2')::DATE AS date, sales
FROM t1
    UNPIVOT (sales FOR date IN ("Sales (05/19/2020)", "Sales (06/03/2020)", "Sales (10/23/2020)"))
 ORDER BY ALL;
----
10629465	2020-05-19	23
10629465	2020-06-03	47
10629465	2020-10-23	99
98765432	2020-05-19	10
98765432	2020-06-03	99
98765432	2020-10-23	33

# base unpivot statement
query III
SELECT id, regexp_replace(date, 'Sales [(]([0-9]+)/([0-9]+)/([0-9]+)[)]', '\3-\1-\2')::DATE AS date, sales
FROM
    (UNPIVOT t1 ON "Sales (05/19/2020)", "Sales (06/03/2020)", "Sales (10/23/2020)" INTO NAME date VALUE sales)
 ORDER BY ALL;
----
10629465	2020-05-19	23
10629465	2020-06-03	47
10629465	2020-10-23	99
98765432	2020-05-19	10
98765432	2020-06-03	99
98765432	2020-10-23	33

# alias
query III
SELECT *
FROM
	(UNPIVOT t1 ON "Sales (05/19/2020)" AS "2020-05-19", "Sales (06/03/2020)" AS "2020-06-03", "Sales (10/23/2020)" AS "2020-10-23" INTO NAME date VALUE sales)
ORDER BY ALL;
----
10629465	2020-05-19	23
10629465	2020-06-03	47
10629465	2020-10-23	99
98765432	2020-05-19	10
98765432	2020-06-03	99
98765432	2020-10-23	33

# regex in UNPIVOT
query III
SELECT id, regexp_replace(date, 'Sales [(]([0-9]+)/([0-9]+)/([0-9]+)[)]', '\3-\1-\2')::DATE AS date, sales FROM t1
    UNPIVOT (Sales FOR Date IN (COLUMNS('Sales.*')))
 ORDER BY ALL;
----
10629465	2020-05-19	23
10629465	2020-06-03	47
10629465	2020-10-23	99
98765432	2020-05-19	10
98765432	2020-06-03	99
98765432	2020-10-23	33

# UNPIVOT statement
query III
SELECT id, regexp_replace(date, 'Sales [(]([0-9]+)/([0-9]+)/([0-9]+)[)]', '\3-\1-\2')::DATE AS date, sales
FROM
	(UNPIVOT t1 ON COLUMNS('Sales.*') INTO NAME date VALUE sales)
ORDER BY ALL;
----
10629465	2020-05-19	23
10629465	2020-06-03	47
10629465	2020-10-23	99
98765432	2020-05-19	10
98765432	2020-06-03	99
98765432	2020-10-23	33

# exclude clause
query III
SELECT id, regexp_replace(date, 'Sales [(]([0-9]+)/([0-9]+)/([0-9]+)[)]', '\3-\1-\2')::DATE AS date, sales
FROM
	(UNPIVOT t1 ON * EXCLUDE (id) INTO NAME date VALUE sales)
ORDER BY ALL;
----
10629465	2020-05-19	23
10629465	2020-06-03	47
10629465	2020-10-23	99
98765432	2020-05-19	10
98765432	2020-06-03	99
98765432	2020-10-23	33