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