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--
-- \crosstabview
--
CREATE TABLE ctv_data (v, h, c, i, d) AS
VALUES
('v1','h2','foo', 3, '2015-04-01'::date),
('v2','h1','bar', 3, '2015-01-02'),
('v1','h0','baz', NULL, '2015-07-12'),
('v0','h4','qux', 4, '2015-07-15'),
('v0','h4','dbl', -3, '2014-12-15'),
('v0',NULL,'qux', 5, '2014-07-15'),
('v1','h2','quux',7, '2015-04-04');
-- make plans more stable
ANALYZE ctv_data;
-- running \crosstabview after query uses query in buffer
SELECT v, EXTRACT(year FROM d), count(*)
FROM ctv_data
GROUP BY 1, 2
ORDER BY 1, 2;
v | extract | count
----+---------+-------
v0 | 2014 | 2
v0 | 2015 | 1
v1 | 2015 | 3
v2 | 2015 | 1
(4 rows)
-- basic usage with 3 columns
\crosstabview
v | 2014 | 2015
----+------+------
v0 | 2 | 1
v1 | | 3
v2 | | 1
(3 rows)
-- ordered months in horizontal header, quoted column name
SELECT v, to_char(d, 'Mon') AS "month name", EXTRACT(month FROM d) AS num,
count(*) FROM ctv_data GROUP BY 1,2,3 ORDER BY 1
\crosstabview v "month name" 4 num
v | Jan | Apr | Jul | Dec
----+-----+-----+-----+-----
v0 | | | 2 | 1
v1 | | 2 | 1 |
v2 | 1 | | |
(3 rows)
-- ordered months in vertical header, ordered years in horizontal header
SELECT EXTRACT(year FROM d) AS year, to_char(d,'Mon') AS """month"" name",
EXTRACT(month FROM d) AS month,
format('sum=%s avg=%s', sum(i), avg(i)::numeric(2,1))
FROM ctv_data
GROUP BY EXTRACT(year FROM d), to_char(d,'Mon'), EXTRACT(month FROM d)
ORDER BY month
\crosstabview """month"" name" year format year
"month" name | 2014 | 2015
--------------+-----------------+----------------
Jan | | sum=3 avg=3.0
Apr | | sum=10 avg=5.0
Jul | sum=5 avg=5.0 | sum=4 avg=4.0
Dec | sum=-3 avg=-3.0 |
(4 rows)
-- combine contents vertically into the same cell (V/H duplicates)
SELECT v, h, string_agg(c, E'\n') FROM ctv_data GROUP BY v, h ORDER BY 1,2,3
\crosstabview 1 2 3
v | h4 | | h0 | h2 | h1
----+-----+-----+-----+------+-----
v0 | qux+| qux | | |
| dbl | | | |
v1 | | | baz | foo +|
| | | | quux |
v2 | | | | | bar
(3 rows)
-- horizontal ASC order from window function
SELECT v,h, string_agg(c, E'\n') AS c, row_number() OVER(ORDER BY h) AS r
FROM ctv_data GROUP BY v, h ORDER BY 1,3,2
\crosstabview v h c r
v | h0 | h1 | h2 | h4 |
----+-----+-----+------+-----+-----
v0 | | | | qux+| qux
| | | | dbl |
v1 | baz | | foo +| |
| | | quux | |
v2 | | bar | | |
(3 rows)
-- horizontal DESC order from window function
SELECT v, h, string_agg(c, E'\n') AS c, row_number() OVER(ORDER BY h DESC) AS r
FROM ctv_data GROUP BY v, h ORDER BY 1,3,2
\crosstabview v h c r
v | | h4 | h2 | h1 | h0
----+-----+-----+------+-----+-----
v0 | qux | qux+| | |
| | dbl | | |
v1 | | | foo +| | baz
| | | quux | |
v2 | | | | bar |
(3 rows)
-- horizontal ASC order from window function, NULLs pushed rightmost
SELECT v,h, string_agg(c, E'\n') AS c, row_number() OVER(ORDER BY h NULLS LAST) AS r
FROM ctv_data GROUP BY v, h ORDER BY 1,3,2
\crosstabview v h c r
v | h0 | h1 | h2 | h4 |
----+-----+-----+------+-----+-----
v0 | | | | qux+| qux
| | | | dbl |
v1 | baz | | foo +| |
| | | quux | |
v2 | | bar | | |
(3 rows)
-- only null, no column name, 2 columns: error
SELECT null,null \crosstabview
\crosstabview: query must return at least three columns
-- only null, no column name, 3 columns: works
SELECT null,null,null \crosstabview
?column? |
----------+--
|
(1 row)
-- null display
\pset null '#null#'
SELECT v,h, string_agg(i::text, E'\n') AS i FROM ctv_data
GROUP BY v, h ORDER BY h,v
\crosstabview v h i
v | h0 | h1 | h2 | h4 | #null#
----+--------+----+----+----+--------
v1 | #null# | | 3 +| |
| | | 7 | |
v2 | | 3 | | |
v0 | | | | 4 +| 5
| | | | -3 |
(3 rows)
\pset null ''
-- refer to columns by position
SELECT v,h,string_agg(i::text, E'\n'), string_agg(c, E'\n')
FROM ctv_data GROUP BY v, h ORDER BY h,v
\crosstabview 2 1 4
h | v1 | v2 | v0
----+------+-----+-----
h0 | baz | |
h1 | | bar |
h2 | foo +| |
| quux | |
h4 | | | qux+
| | | dbl
| | | qux
(5 rows)
-- refer to columns by positions and names mixed
SELECT v,h, string_agg(i::text, E'\n') AS i, string_agg(c, E'\n') AS c
FROM ctv_data GROUP BY v, h ORDER BY h,v
\crosstabview 1 "h" 4
v | h0 | h1 | h2 | h4 |
----+-----+-----+------+-----+-----
v1 | baz | | foo +| |
| | | quux | |
v2 | | bar | | |
v0 | | | | qux+| qux
| | | | dbl |
(3 rows)
-- refer to columns by quoted names, check downcasing of unquoted name
SELECT 1 as "22", 2 as b, 3 as "Foo"
\crosstabview "22" B "Foo"
22 | 2
----+---
1 | 3
(1 row)
-- error: bad column name
SELECT v,h,c,i FROM ctv_data
\crosstabview v h j
\crosstabview: column name not found: "j"
-- error: need to quote name
SELECT 1 as "22", 2 as b, 3 as "Foo"
\crosstabview 1 2 Foo
\crosstabview: column name not found: "foo"
-- error: need to not quote name
SELECT 1 as "22", 2 as b, 3 as "Foo"
\crosstabview 1 "B" "Foo"
\crosstabview: column name not found: "B"
-- error: bad column number
SELECT v,h,i,c FROM ctv_data
\crosstabview 2 1 5
\crosstabview: column number 5 is out of range 1..4
-- error: same H and V columns
SELECT v,h,i,c FROM ctv_data
\crosstabview 2 h 4
\crosstabview: vertical and horizontal headers must be different columns
-- error: too many columns
SELECT a,a,1 FROM generate_series(1,3000) AS a
\crosstabview
\crosstabview: maximum number of columns (1600) exceeded
-- error: only one column
SELECT 1 \crosstabview
\crosstabview: query must return at least three columns
DROP TABLE ctv_data;
-- check error reporting (bug #14476)
CREATE TABLE ctv_data (x int, y int, v text);
INSERT INTO ctv_data SELECT 1, x, '*' || x FROM generate_series(1,10) x;
SELECT * FROM ctv_data \crosstabview
x | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10
---+----+----+----+----+----+----+----+----+----+-----
1 | *1 | *2 | *3 | *4 | *5 | *6 | *7 | *8 | *9 | *10
(1 row)
INSERT INTO ctv_data VALUES (1, 10, '*'); -- duplicate data to cause error
SELECT * FROM ctv_data \crosstabview
\crosstabview: query result contains multiple data values for row "1", column "10"
DROP TABLE ctv_data;
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