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a3aef88e6a
\crosstabview's complaint about multiple entries for the same crosstab cell quoted the wrong row and/or column values. It would accidentally appear to work if the data had been in strcmp() order to start with, which probably explains how we missed noticing this during development. This could be fixed in more than one way, but the way I chose was to hang onto both result pointers from bsearch() and use those to get at the value names. In passing, avoid casting away const in the bsearch comparison functions. No bug there, just poor style. Per bug #14476 from Tomonari Katsumata. Back-patch to 9.6 where \crosstabview was introduced. Report: https://postgr.es/m/20161225021519.10139.45460@wrigleys.postgresql.org
124 lines
3.6 KiB
SQL
124 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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