tablas pivotes ejemplos 2
Publicado por outrera (35 intervenciones) el 16/04/2014 23:01:15
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CREATE TABLE inventory
( item_id serial NOT NULL,item_name varchar(100) NOT NULL,
CONSTRAINT pk_inventory PRIMARY KEY (item_id),
CONSTRAINT inventory_item_name_idx UNIQUE (item_name)
)WITH (OIDS=FALSE);
CREATE TABLE inventory_flow
( inventory_flow_id serial NOT NULL, item_id integer NOT NULL,project varchar(100),
num_used integer, num_ordered integer,action_date timestamp without time zone
NOT NULL DEFAULT CURRENT_TIMESTAMP,CONSTRAINT pk_inventory_flow PRIMARY KEY (inventory_flow_id),
CONSTRAINT fk_item_id FOREIGN KEY (item_id)
REFERENCES inventory (item_id)
ON UPDATE CASCADE ON DELETE RESTRICT
)WITH (OIDS=FALSE);
CREATE INDEX inventory_flow_action_date_idx
ON inventory_flow
USING btree
(action_date)
WITH (FILLFACTOR=95);
INSERT INTO inventory(item_name) VALUES('CSCL (g)');
INSERT INTO inventory(item_name) VALUES('DNA Ligase (ul)');
INSERT INTO inventory(item_name) VALUES('Phenol (ul)');
INSERT INTO inventory(item_name) VALUES('Pippette Tip 10ul');
INSERT INTO inventory_flow(item_id, project, num_ordered, action_date)
SELECT i.item_id, 'Initial Order', 10000, '2007-01-01'
FROM inventory i;
--Similulate usage
INSERT INTO inventory_flow(item_id, project, num_used, action_date)
SELECT i.item_id, 'MS', n*2,
'2007-03-01'::timestamp + (n || ' day')::interval + ((n + 1) || ' hour')::interval
FROM inventory As i CROSS JOIN generate_series(1, 250) As n
WHERE mod(n + 42, i.item_id) = 0;
INSERT INTO inventory_flow(item_id, project, num_used, action_date)
SELECT i.item_id, 'Alzheimer''s', n*1,
'2007-02-26'::timestamp + (n || ' day')::interval + ((n + 1) || ' hour')::interval
FROM inventory as i CROSS JOIN generate_series(50, 100) As n
WHERE mod(n + 50, i.item_id) = 0;
INSERT INTO inventory_flow(item_id, project, num_used, action_date)
SELECT i.item_id, 'Mad Cow', n*i.item_id,
'2007-02-26'::timestamp + (n || ' day')::interval + ((n + 1) || ' hour')::interval
FROM inventory as i CROSS JOIN generate_series(50, 200) As n
WHERE mod(n + 7, i.item_id) = 0 AND i.item_name IN('Pippette Tip 10ul', 'CSCL (g)');
vacuum analyze;
-----------
---------------------Using crosstab(source_sql, category_sql)---
--Standard group by aggregate query before we pivot to cross tab
--This we use for our source sql
SELECT i.item_name::text As row_name, to_char(if.action_date, 'mon')::text As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM inventory As i INNER JOIN inventory_flow As if
ON i.item_id = if.item_id
WHERE (if.num_used <> 0 AND if.num_used IS NOT NULL)
AND action_date BETWEEN date '2007-01-01' and date '2007-12-31 23:59'
GROUP BY i.item_name, to_char(if.action_date, 'mon'), date_part('month', if.action_date)
ORDER BY i.item_name, date_part('month', if.action_date);
--Helper query to generate lowercase month names - this we will use for our category sql
SELECT to_char(date '2007-01-01' + (n || ' month')::interval, 'mon') As short_mname
FROM generate_series(0,11) n;
--Resulting crosstab query --Note: For this we don't need the order by month since the order of the columns is determined by the category_sql row order
SELECT mthreport.*
FROM
crosstab('SELECT i.item_name::text As row_name, to_char(if.action_date, ''mon'')::text As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM inventory As i INNER JOIN inventory_flow As if
ON i.item_id = if.item_id
AND action_date BETWEEN date ''2007-01-01'' and date ''2007-12-31 23:59''
GROUP BY i.item_name, to_char(if.action_date, ''mon''), date_part(''month'', if.action_date)
ORDER BY i.item_name',
'SELECT to_char(date ''2007-01-01'' + (n || '' month'')::interval, ''mon'') As short_mname
FROM generate_series(0,11) n')
As mthreport(item_name text, jan integer, feb integer, mar integer,
apr integer, may integer, jun integer, jul integer,
aug integer, sep integer, oct integer, nov integer,
dec integer)
---- Using crosstab(source_sql)
--Code to generate the row tally - before crosstab
SELECT i.item_name::text As row_name, i.start_date::date As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM (SELECT inventory.*,
date '2007-01-01' + (n || ' month')::interval As start_date,
date '2007-01-01' + ((n + 1) || ' month')::interval + - '1 minute'::interval As end_date
FROM inventory CROSS JOIN generate_series(0,11) n) As i
LEFT JOIN inventory_flow As if
ON (i.item_id = if.item_id AND if.action_date BETWEEN i.start_date AND i.end_date)
GROUP BY i.item_name, i.start_date
ORDER BY i.item_name, i.start_date;
--Now we feed the above into our crosstab query to achieve the same result as
--our crosstab(source, category) example
SELECT mthreport.*
FROM crosstab('SELECT i.item_name::text As row_name, i.start_date::date As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM (SELECT inventory.*,
date ''2007-01-01'' + (n || '' month'')::interval As start_date,
date ''2007-01-01'' + ((n + 1) || '' month'')::interval + - ''1 minute''::interval As end_date
FROM inventory CROSS JOIN generate_series(0,11) n) As i
LEFT JOIN inventory_flow As if
ON (i.item_id = if.item_id AND if.action_date BETWEEN i.start_date AND i.end_date)
GROUP BY i.item_name, i.start_date
ORDER BY i.item_name, i.start_date;')
As mthreport(item_name text, jan integer, feb integer,
mar integer, apr integer,
may integer, jun integer, jul integer, aug integer,
sep integer, oct integer, nov integer, dec integer)
--------------
SELECT projreport.*
FROM crosstab('SELECT i.item_name::text As row_name,
if.project::text As bucket,
if.project::text As bucketvalue
FROM inventory i
LEFT JOIN inventory_flow As if
ON (i.item_id = if.item_id)
WHERE if.num_used > 0
GROUP BY i.item_name, if.project
ORDER BY i.item_name, SUM(if.num_used) DESC, if.project')
As projreport(item_name text, project_rank_1 text, project_rank_2 text,
project_rank_3 text)
--*************Tricking crosstab to give you more than one row header column*******************----
SELECT mthreport.row_name[1] As project, mthreport.row_name[2] As item_name,
jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec
FROM
crosstab('SELECT ARRAY[if.project::text, i.item_name::text] As row_name,
to_char(if.action_date, ''mon'')::text As bucket, SUM(if.num_used)::integer As bucketvalue
FROM inventory As i INNER JOIN inventory_flow As if
ON i.item_id = if.item_id
AND action_date BETWEEN date ''2007-01-01'' and date ''2007-12-31 23:59''
WHERE if.num_used <> 0
GROUP BY if.project, i.item_name, to_char(if.action_date, ''mon''),
date_part(''month'', if.action_date)
ORDER BY if.project, i.item_name',
'SELECT to_char(date ''2007-01-01'' + (n || '' month'')::interval, ''mon'') As short_mname
FROM generate_series(0,11) n')
As mthreport(row_name text[], jan integer, feb integer, mar integer,
apr integer, may integer, jun integer, jul integer,
aug integer, sep integer, oct integer, nov integer,
dec integer)
---Building your own custom crosstab function
SELECT mthreport.row_name[1] As project, mthreport.row_name[2] As item_name,
jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec
FROM
crosstabmonthint('SELECT ARRAY[if.project::text, i.item_name::text] As row_name, to_char(if.action_date, ''mon'')::text As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM inventory As i INNER JOIN inventory_flow As if
ON i.item_id = if.item_id
AND action_date BETWEEN date ''2007-01-01'' and date ''2007-12-31 23:59''
WHERE if.num_used <> 0
GROUP BY if.project, i.item_name, to_char(if.action_date, ''mon''), date_part(''month'', if.action_date)
ORDER BY if.project, i.item_name',
'SELECT to_char(date ''2007-01-01'' + (n || '' month'')::interval, ''mon'') As short_mname
FROM generate_series(0,11) n')
As mthreport;
---Adding a Total column to the crosstab query
--This we use for our source sql
SELECT i.item_name::text As row_name,
(SELECT SUM(sif.num_used)
FROM inventory_flow sif
WHERE action_date BETWEEN date '2007-01-01' and date '2007-12-31 23:59'
AND sif.item_id = i.item_id)::integer As total,
to_char(if.action_date, 'mon')::text As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM inventory As i INNER JOIN inventory_flow As if
ON i.item_id = if.item_id
WHERE (if.num_used <> 0 AND if.num_used IS NOT NULL)
AND action_date BETWEEN date '2007-01-01' and date '2007-12-31 23:59'
GROUP BY i.item_name, total, to_char(if.action_date, 'mon'), date_part('month', if.action_date)
ORDER BY i.item_name, date_part('month', if.action_date);
--This we use for our category sql
SELECT to_char(date '2007-01-01' + (n || ' month')::interval, 'mon') As short_mname
FROM generate_series(0,11) n;
--Now our cross tabulation query
SELECT mthreport.*
FROM crosstab('SELECT i.item_name::text As row_name,
(SELECT SUM(sif.num_used)
FROM inventory_flow sif
WHERE action_date BETWEEN date ''2007-01-01'' and date ''2007-12-31 23:59''
AND sif.item_id = i.item_id)::integer As total,
to_char(if.action_date, ''mon'')::text As bucket,
SUM(if.num_used)::integer As bucketvalue
FROM inventory As i INNER JOIN inventory_flow As if
ON i.item_id = if.item_id
WHERE (if.num_used <> 0 AND if.num_used IS NOT NULL)
AND action_date BETWEEN date ''2007-01-01'' and date ''2007-12-31 23:59''
GROUP BY i.item_name, total, to_char(if.action_date, ''mon''), date_part(''month'', if.action_date)
ORDER BY i.item_name, date_part(''month'', if.action_date)',
'SELECT to_char(date ''2007-01-01'' + (n || '' month'')::interval, ''mon'') As short_mname
FROM generate_series(0,11) n'
)
As mthreport(item_name text, total integer, jan integer, feb integer,
mar integer, apr integer,
may integer, jun integer, jul integer, aug integer,
sep integer, oct integer, nov integer, dec integer)Valora esta pregunta
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