217 lines
6.6 KiB
Plaintext
217 lines
6.6 KiB
Plaintext
--
|
|
-- \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;
|