I am trying to get this query for a database question( Unlucky wmployees) to Postgres. I am having a hard time getting it right
CREATE PROCEDURE unluckyEmployees()
BEGIN
SET #rn =0;
SELECT dep_name, emp_number, total_salary FROM
(SELECT dep_name, emp_number, total_salary, (#rn := #rn + 1) as seqnum FROM
(SELECT name AS dep_name, IF(e.id IS NULL, 0, COUNT(*)) AS emp_number, IFNULL(SUM(salary), 0) AS total_salary
FROM Department d LEFT JOIN Employee e ON e.Department = d.id
GROUP BY d.id HAVING COUNT(*) < 6 ORDER BY SUM(salary) DESC, COUNT(*) DESC, d.id) t )tt WHERE mod(seqnum, 2) = 1;
END
I am hoping to get the query in postgres. Tried setting #rn to row_number() but still not working.
UPDATE amc_machine b
SET with_parts = a.with_parts,
amc_validity_upto = a.amc_validity_upto
FROM (SELECT CASE
WHEN count(*) > 0 THEN (SELECT DISTINCT ON (machine_id) with_parts, amc_validity_upto, machine_id
FROM amc_amcdetail
WHERE machine_id = 2 AND id != 1
ORDER BY machine_id, amc_validity_upto DESC)
WHEN count(*) = 0 THEN (SELECT FALSE AS with_parts, NULL AS amc_validity_upto, 2 AS machine_id)
END AS a
FROM (SELECT DISTINCT ON (machine_id) with_parts, amc_validity_upto, machine_id
FROM amc_amcdetail
WHERE machine_id = 2
ORDER BY machine_id, amc_validity_upto
) AS T) AS foo
WHERE a.machine_id = b.id
The error shown is
ERROR: subquery must return only one column
LINE 5: WHEN count(*) > 0 THEN (SELECT DISTINCT ON (machine_id) w...
Can anyone tell what seems to be the problem.
Basically the query is to update on table b with data from table a if exists, else update with null , false as the case is.
The query executes when standalone. I am using Postgres 9.3, but deployment will be on postgres9.1
The subquery returns 3 columns
SELECT DISTINCT ON (machine_id) with_parts, amc_validity_upto, machine_id
Make it return only one
SELECT DISTINCT ON (machine_id) with_parts
Thank you for taking the time to look at my question.
I've seen similar questions, but not the same depth. Please help!
I would like to update a column all rows in a table that holds user_id and date_created with the lowest date_created for the user_id.
The following select gives me all the rows I would like to update:
select user_id, min(date_created) from mytable s1 where
(select count(1) from mytable s2 where
s1.user_id = s2.user_id group by s2.user_id)
> 1 group by user_id order by user_id;
I would have expected this update to work:
update mytable set join_status = 1 where date_created =
(select min(date_created) from mytable s1 where
(select count(1) from simplepay_payment s2 where
s1.user_id = s2.user_id group by s2.user_id)
> 1 group by user_id);
But is gave the following error:
ERROR: more than one row returned by a subquery used as an expression
I've tried a few different solutions, but nothing seems to help.
Does anyone have any ideas fro me?
Thanks again.
Change your SQL to:
update mytable set join_status = 1 where date_created IN
(select min(date_created) from mytable s1 where
(select count(1) from simplepay_payment s2 where
s1.user_id = s2.user_id group by s2.user_id)
> 1 group by user_id);
Read more on row comparison in the docs.
EDIT:
In the subquery you're performing GROUP BY user_id. This means that you will receive many rows, based on the number of unique user_id values in your simplepay_payment table.
To make your query working as expected, you should join using 2 columns: user_id and date_created. As you've mentioned, you already have the query that gives you the correct results, so you can use it like this:
WITH desired AS (
SELECT user_id, min(date_created) AS mindt
FROM mytable s1 where
(SELECT count(1) FROM mytable s2
WHERE s1.user_id = s2.user_id GROUP BY s2.user_id) > 1
GROUP BY user_id)
UPDATE mytable m SET join_status = 1 FROM desired d
WHERE d.user_id = m.user_id AND d.mindt = m.date_created;
I've wrapped in your query into the Common Table Expression and used it in the UPDATE statement. You can add RETURNING m.* at the end of the query to see the rows that had been updated and their new values.
You can test this query on SQL Fiddle.
EDIT2:
Common Table Expressions (WITH-queries) are not available before version 9.1 for UPDATE statements. You can simply move the CTE subquery into the update, like this:
UPDATE mytable m SET join_status = 1 FROM (
SELECT user_id, min(date_created) AS mindt
FROM mytable s1 where
(SELECT count(1) FROM mytable s2
WHERE s1.user_id = s2.user_id GROUP BY s2.user_id) > 1
GROUP BY user_id) d
WHERE d.user_id = m.user_id AND d.mindt = m.date_created;
I have written sql statement :
select * from (
select count(*) as NumberofSignals,signals.transmitter_account,signals.class,signals.type,signals.signal_mode,
signals.area_id,signals.sector_id,signals.region_info_id,signals.zone_info_id,signals.user_id,signals.device_id,
signals.panel_name,signals.panel_id,signals.sector_name,signals.region_code,signals.area_name,signals.zone_code,
signals.description,signals.transmitter_name,signals.transmitter_id,signals.color,'event' as Event,get_name(signals.id,'event') as event_value,
'packetnumber' as packetnumber,get_name(signals.id,'packetnumber') as packetnumber_value,wm_concat(distinct get_name(signals.id,'repeater')) as repeater,
round(avg(get_name(signals.id,'signallevel'))) as avg_signallevel,min(to_char(signals.signal_forming_time, 'yyyy/mm/dd hh24:mi:ss')) as formingtime,
get_name(signals.id,'address') as address,get_name(signals.id,'username') as username,get_name(signals.id,'chaneltype') as channeltype,
get_name(signals.id,'code') as code,get_name(signals.id,'account') as account
from signals,signal_custom_fields where signals.id = signal_custom_fields.signal_id and
signals.id in (select id from (select id,rownum num from((select signals.id
from signals,signal_custom_fields where signal_custom_fields.field_name = 'event'
and signal_custom_fields.field_value is not null and signals.id = signal_custom_fields.signal_id
and signals.signal_forming_time >= to_date('2011/5/10 14:34:44', 'yyyy/mm/dd hh24:mi:ss')
AND signals.signal_forming_time <= to_date('2011/5/10 15:34:44', 'yyyy/mm/dd hh24:mi:ss'))
intersect (select distinct signals.id from signals,signal_custom_fields
where signal_custom_fields.field_name = 'packetnumber' and signal_custom_fields.field_value is not null
and signals.id = signal_custom_fields.signal_id
and signals.signal_forming_time >= to_date('2011/5/10 14:34:44', 'yyyy/mm/dd hh24:mi:ss')
AND signals.signal_forming_time <= to_date('2011/5/10 15:34:44', 'yyyy/mm/dd hh24:mi:ss')))
order by id desc)) group by 'event',signals.transmitter_account,signals.class,
signals.type,signals.signal_mode,signals.area_id,signals.sector_id,signals.region_info_id,signals.zone_info_id,
signals.user_id,signals.device_id,signals.panel_name,signals.panel_id,signals.sector_name,signals.region_code,
signals.area_name,signals.zone_code,signals.description,signals.transmitter_name,signals.transmitter_id,
signals.color, get_name(signals.id,'event'), 'packetnumber',get_name(signals.id,'username'),
get_name(signals.id,'chaneltype'),
get_name(signals.id,'code'),
get_name(signals.id,'account'), get_name(signals.id,'packetnumber'),get_name(signals.id,'address'),
TO_CHAR(signals.signal_forming_time ,'dd/mm/yyyy hh24'),
TRUNC(to_number(to_char(signals.signal_forming_time ,'mi'))/(30))
order by event)where rownum < 300
and here i get the first 300 rows, but how i need to rewright this statment to retrieve second 300 rows ???
Your query doesn't have the rownum listed in the first nested table. Add a rownum column in the first nested table then you can do a between function in the where clause at the top level:
--create a demo table
DROP TABLE paging_test;
CREATE TABLE paging_test AS
(SELECT rownum x FROM user_tables
);
--count how many records exist (in my case there is 821)
SELECT COUNT(*)
FROM paging_test;
--get the first 300 rows
SELECT *
FROM
(SELECT rownum rn, x FROM paging_test ORDER BY x
) pt
WHERE pt.rn BETWEEN 1 AND 300 ;
--get the next 300 rows
SELECT *
FROM
(SELECT rownum rn, x FROM paging_test ORDER BY x
) pt
WHERE pt.rn BETWEEN 300 AND 600 ;
You might also be interested in my reference:
References:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:948366252775
Just a brief of business scenario is table has been created for a good receipt. So here we have good expected line with PurchaseOrder(PO) in first few line. And then we receive each expected line physically and that time these quantity may be different, due to business case like quantity may damage and short quantity like that. So we maintain a status for that eg: OK, Damage, also we have to calculate short quantity based on total of expected quantity of each item and total of received line.
if object_id('DEV..Temp','U') is not null
drop table Temp
CREATE TABLE Temp
(
ID INT IDENTITY(1,1) PRIMARY KEY CLUSTERED,
Item VARCHAR(32),
PO VARCHAR(32) NULL,
ExpectedQty INT NULL,
ReceivedQty INT NULL,
[STATUS] VARCHAR(32) NULL,
BoxName VARCHAR(32) NULL
)
Please see first few line with PO data will be the expected lines,
and then rest line will be received line
INSERT INTO TEMP (Item,PO,ExpectedQty,ReceivedQty,[STATUS],BoxName)
SELECT 'ITEM01','PO-01','30',NULL,NULL,NULL UNION ALL
SELECT 'ITEM01','PO-02','20',NULL,NULL,NULL UNION ALL
SELECT 'ITEM02','PO-01','40',NULL,NULL,NULL UNION ALL
SELECT 'ITEM03','PO-01','50',NULL,NULL,NULL UNION ALL
SELECT 'ITEM03','PO-02','30',NULL,NULL,NULL UNION ALL
SELECT 'ITEM03','PO-03','20',NULL,NULL,NULL UNION ALL
SELECT 'ITEM04','PO-01','30',NULL,NULL,NULL UNION ALL
SELECT 'ITEM01',NULL,NULL,'20','OK','box01' UNION ALL
SELECT 'ITEM01',NULL,NULL,'25','OK','box02' UNION ALL
SELECT 'ITEM01',NULL,NULL,'5','DAMAGE','box03' UNION ALL
SELECT 'ITEM02',NULL,NULL,'38','OK','box04' UNION ALL
SELECT 'ITEM02',NULL,NULL,'2','DAMAGE','box05' UNION ALL
SELECT 'ITEM03',NULL,NULL,'30','OK','box06' UNION ALL
SELECT 'ITEM03',NULL,NULL,'30','OK','box07' UNION ALL
SELECT 'ITEM03',NULL,NULL,'30','OK','box08' UNION ALL
SELECT 'ITEM03',NULL,NULL,'10','DAMAGE','box09' UNION ALL
SELECT 'ITEM04',NULL,NULL,'25','OK','box10'
Below Table is my expected result based on above data.
I need to show those data following way.
So I appreciate if you can give me an appropriate query for it.
Note: first row is blank and it is actually my table header. :)
SELECT '' as 'ITEM', '' as 'PO#', '' as 'ExpectedQty',
'' as 'ReceivedQty','' as 'DamageQty' ,'' as 'ShortQty' UNION ALL
SELECT 'ITEM01','PO-01','30','30','0' ,'0' UNION ALL
SELECT 'ITEM01','PO-02','20','15','5' ,'0' UNION ALL
SELECT 'ITEM02','PO-01','40','38','2' ,'0' UNION ALL
SELECT 'ITEM03','PO-01','50','50','0' ,'0' UNION ALL
SELECT 'ITEM03','PO-02','30','30','0' ,'0' UNION ALL
SELECT 'ITEM03','PO-03','20','10','10','0' UNION ALL
SELECT 'ITEM04','PO-01','30','25','0' ,'5'
Note : we don't received more than expected.
solution should be based on SQL 2000
You should reconsider how you store this data. Separate Expected and Received+Damaged in different tables (you have many unused (null) cells). This way any query should become more readable.
I think what you try to do can be achieved more easily with a stored procedure.
Anyway, try this query:
SELECT Item, PO, ExpectedQty,
CASE WHEN [rec-consumed] > 0 THEN ExpectedQty
ELSE CASE WHEN [rec-consumed] + ExpectedQty > 0
THEN [rec-consumed] + ExpectedQty
ELSE 0
END
END ReceivedQty,
CASE WHEN [rec-consumed] < 0
THEN CASE WHEN DamageQty >= -1*[rec-consumed]
THEN -1*[rec-consumed]
ELSE DamageQty
END
ELSE 0
END DamageQty,
CASE WHEN [rec_damage-consumed] < 0
THEN DamageQty - [rec-consumed]
ELSE 0
END ShortQty
FROM (
select t1.Item,
t1.PO,
t1.ExpectedQty,
st.sum_ReceivedQty_OK
- (sum(COALESCE(t2.ExpectedQty,0))
+t1.ExpectedQty)
[rec-consumed],
st.sum_ReceivedQty_OK + st.sum_ReceivedQty_DAMAGE
- (sum(COALESCE(t2.ExpectedQty,0))
+t1.ExpectedQty)
[rec_damage-consumed],
st.sum_ReceivedQty_DAMAGE DamageQty
from #tt t1
left join #tt t2 on t1.Item = t2.Item
and t1.PO > t2.PO
and t2.PO is not null
join (select Item
, sum(CASE WHEN status = 'OK' THEN ReceivedQty ELSE 0 END)
sum_ReceivedQty_OK
, sum(CASE WHEN status != 'OK' THEN ReceivedQty ELSE 0 END)
sum_ReceivedQty_DAMAGE
from #tt where PO is null
group by Item) st on t1.Item = st.Item
where t1.PO is not null
group by t1.Item, t1.PO, t1.ExpectedQty,
st.sum_ReceivedQty_OK,
st.sum_ReceivedQty_DAMAGE
) a
order by Item, PO