I have table having below records
Sno A
- --
1 spoo74399p
2 spoo75399p
I want to update the above records by replacing oo (alphabet 'o') by empty after sp
afte
Required OUTPUT
----------------
Sno A
1 sp74399p
2 sp75399p
UPDATE my_table
SET A = REPLACE(A, 'spoo', 'sp');
This would update all the records.
To clarify a bit, this would find any instances of "spoo" and replace them with "sp". The end result is that any "oo" right after "sp" would be deleted.
Related
I'm trying to solve this problem:
I have a query/view that will join ~10 tables to extract some fields for a report (if any). The query doesn't use any grouping function, only joins and cut off some unuseful data.
I have to take this one big view, get the group for the first index, take the max of a date in the second column and take all the information from other fields referring the record of the max value.
I cannot be able to to this in postgres.
As a pseudo code I can give this:
select 1
, max(2)
, 3 referred to the record from max(2)
, 4 referred to the record from max(2)
, ...
, 20 referred to the record from max(2)
from (ViewWithAllJoins) a
group by 1
For privacy and business problem I had to obfuscate some informations, 1/2/3/4... are the name of the column from the view "ViewWithAllJoins", I hope that the problem is still understandable and resolvable!
I've tryied with WINDOW command as reported in Convert keep dense_rank from Oracle query into postgres but I cannot be able to use the group by that I need. Other tryes that I've done was about the dense_rank like shown in Dense_rank first Oracle to Postgresql convert but I can't do any assumption on the order of the data in any of the other fields in exception of 1 and 2, so I can't use any of the aggregate function on them.
Any ideas? Possibly without adding too much subqueryes.
Thank you!
EDIT:
As suggested I'll add some synthetic data to better understand the problem and what I want.
Start:
ID DATE COLUMN1 COLUMN2 COLUMN3
=====================================================================
88888888;"2016-04-02 09:00:00";"aaaaaaaaaaa";"TEXT89" ; 999999999
88888888;"2018-08-21 09:00:00";"a" ;"TEXT1" ; 988888888
88888888;"2017-11-09 09:00:00";"zzzz" ;"TEXT80000" ; 850580582
75858585;"2017-01-31 09:00:00";"~~~~~~~~~~~";"TEXT10" ; 101010101
75858585;"2018-04-02 09:00:00";"eeeeeeeeeee";"TEXT1000" ; 111111111
99999999;"2016-04-02 09:00:00";"8d2ecafd866";"TEXT808911"; 777777777
What I want:
ID DATE COLUMN1 COLUMN2 COLUMN3
===================================================================
88888888;"2018-08-21 09:00:00";"a" ;"TEXT1" ; 988888888
75858585;"2018-04-02 09:00:00";"eeeeeeeeeee";"TEXT1000" ; 111111111
99999999;"2016-04-02 09:00:00";"8d2ecafd866";"TEXT808911"; 777777777
So the group by id, the max of the date and the other fields related to the row of the max date.
-- So you have duplicate records per ID, and for every ID you want to select the record with the most recent date ?
Use NOT EXISTS:
SELECT id,zdate,column1,column2,column3 -- , ...
FROM queryview t
WHERE NOT EXISTS (
SELECT *
FROM queryview x
WHERE x.id=t.id
AND x.zdate > t.zdate
);
Or, use row_number() over a window, and pick only the row with the final date:
SELECT id,zdate,column1,column2,column3 -- , ...
FROM ( SELECT *
, row_number() OVER(PARTITION BY id, ORDER BY zdate DESC) AS rn
FROM queryview
) q
WHERE q.rn = 1
;
I have a table in postgres whose primary key is assinged using a sequence (let's call it 'a_seq'). The sequence is for incrementing the value and inserting the current value as primary key of record being inserted.
Code i use for sequence:
CREATE SEQUENCE public.a_seq
INCREMENT 1
START 1
MINVALUE 1
MAXVALUE 9223372036854775807
CACHE 1;
ALTER SEQUENCE public.AssembleTable_RowId_seq OWNER TO postgres;
I am trying to copy a file from a disk and insert the information about copied file to table. There are files with same name in the disk so i'm retrieving the "last_value" from the sequence with this query:
SELECT last_value FROM a_seq;
and rename file "_" then insert it do database so the file name and the primary key (id) of that file is coherent like:
id | fileName
1 | 1_asd.txt
But when i insert the record, the id is always 1 value greater than the "last_value" a get from the query so table looks like this:
id | fileName
2 | 1_asd.txt
And i've tried to execute the select query above multiple times to check if its increment the value but it doesn't.
Any idea how to get the value which will be assinged to the record before the insertion?
NOTE: I use MATLAB and this is the code is use for insertion:
colnames = {'DataType' , ...
'FilePath' , ...
'FileName' , ...
'FileVersion' , ...
'CRC32Q' , ...
'InsertionDateTime', ...
'DataSource' };
data = {FileLine{5} ,... % DataType
tempPath ,... % FilePath
FileLine{1} ,... % FileName
FileLine{2} ,... % FileVersion
FileLine{3} ,... % CRC32Q
FileLine{4} ,... % InsertionDateTime
FileLine{6} ,... % DataSource};
data_table = cell2table(data, 'VariableNames', colnames);
datainsert(conn , 'CopiedFiles' , colnames , data_table);
updated
What I believe happens for you is: when you select last_value - you get last used sequence value and when you insert row, the default value for id is nextval, which rolls value by one above...
previous
I believe you have an extra nextval somewhere in middle step. If you do it in one statement, it works as you expect, eg:
t=# create table so12(s int default nextval('s'), t text);
CREATE TABLE
t=# insert into so12(t) select last_value||'_abc.txt' from s;
INSERT 0 1
t=# select * from so12;
s | t
---+-----------
1 | 1_abc.txt
(1 row)
update2
as Nick Barnes noticed, further (then initial1) iterations will give wrong results, su you need to use heis proposed CASE logic
This is a quirk in the way Postgres implements sequences; as inherently non-transactional objects in a transactional database, they behave a bit strangely.
The first time you call nextvalue() on a sequence, it will not affect the number you see in a_seq.last_value. However, it will flip the a_seq.is_called flag:
test=# create sequence a_seq;
test=# select last_value, is_called from a_seq;
last_value | is_called
------------+-----------
1 | f
test=# select nextval('a_seq');
nextval
---------
1
test=# select last_value, is_called from a_seq;
last_value | is_called
------------+-----------
1 | t
So if you need the next value in the sequence, you'd want something like
SELECT
last_value + CASE WHEN is_called THEN 1 ELSE 0 END
FROM a_seq
Note that this is horribly broken if two processes are doing this concurrently, as there's no guarantee you'll actually receive this value from your next nextval() call. In that case, if you really need the filename to match the id, you'd need to either generate it with a trigger, or UPDATE it once you know what the id is.
But in my experience, it's best to avoid any dependencies between your data and your keys. If all you need is a unique filename, I'd just create an independent filename_seq.
When INSERT statement is executed without a value for id - Postgres automatically takes it from sequence using next_val. List of columns in the variable colnames does not have an id, so PG takes next value from the sequence. To solve the problem you may add id to colnames.
To avoid any dependencies between your data and your keys, Please try:
CREATE SEQUENCE your_sequence
INCREMENT 1
MINVALUE 1
MAXVALUE 9223372036854775807
START 1
CACHE 1;
ALTER TABLE your_sequence
OWNER TO postgres;
I'm trying this query to move some metadata in a hstore attribute
UPDATE media_files
SET metadata = hstore (bb)
FROM
(
SELECT
video_bitrate,
video_codec,
video_resolution,
video_fps,
video_aspect,
video_container,
audio_codec,
audio_bitrate,
audio_sample_rate
FROM
media_files
) AS bb
])
The table has 15 million records, I left the job running for 15 hours and it didn't finish and I'm not able to keep track since the table seems to be locked out for good during the operation.
Is there something I can do to optimize this?
Note: this assumes you have the space on your server for two copies of the table + indexes. Should work on PostgreSQL 9.2+
CREATE TABLE media_files_temp AS
WITH cte AS
(SELECT video_bitrate,
video_codec,
video_resolution,
video_fps,
video_aspect,
video_container,
audio_codec,
audio_bitrate,
audio_sample_rate,
<your default value>::INTEGER as play_count
FROM media_files mf)
SELECT cte.*,
HSTORE('video_bitrate',video_bitrate) ||
HSTORE('video_codec',video_codec) ||
HSTORE('video_resolution',video_resolution) ||
HSTORE('video_fps',video_fps) ||
HSTORE('video_aspect',video_aspect) ||
HSTORE('video_container',video_container) ||
HSTORE('audio_codec',audio_codec) ||
HSTORE('audio_bitrate',audio_bitrate) ||
HSTORE('audio_sample_rate',audio_sample_rate)
as metadata
FROM cte;
[create your indexes]
BEGIN;
ALTER TABLE media_files RENAME TO media_files_orig;
ALTER TABLE media_files_temp RENAME TO media_files;
COMMIT;
-- a new column was requested by the OP
ALTER TABLE media_files ALTER your_new_col SET DEFAULT <something>;
ANALYZE media_files;
A useful answer has already been accepted, but there's something important to point out to future readers.
Your original query had a self-join with no constraining criteria. So - your 15 million row table was receiving 225 trillion updates.
I am trying to create a stored procedure that will split 3 text boxes on a webpage that have user input that all have comma delimited strings in it. We have a field called 'combined_name' in our table that we have to search for first and last name and any known errors or nicknames etc. such as #p1: 'grei,grie' #p2: 'joh,jon,j..' p3: is empty.
The reason for the third box is after I get the basics set up we will have does not contain, starts with, ends with and IS to narrow our results further.
So I am looking to get all records that CONTAINS any combination of those. I originally wrote this in LINQ but it didn't work as you cannot query a list and a dataset. The dataset is too large (1.3 million records) to be put into a list so I have to use a stored procedure which is likely better anyway.
Will I have to use 2 SP, one to split each field and one for the select query or can this be done with one? What function do I use for contains in tsql? I tried using IN win a query but cannot figure out how it works with multiple parameters.
Please note that this will be an internal site that has limited access so worrying about sql injection is not a priority.
I did attempt dynamic SQL but am not getting the correct results back:
CREATE PROCEDURE uspJudgments #fullName nvarchar(100) AS
EXEC('SELECT *
FROM new_judgment_system.dbo.defendants_ALL
WHERE combined_name IN (' + #fullName + ')')
GO
EXEC uspJudgments #fullName = '''grein'', ''grien'''
Even if this did retrieve the correct results how would this be done with 3 parameters?
You may try use this to split string and obtain a tables of strings. Then to have all the combinations you may use full join of these two tables. And then do your select.
Here is the Table valued function I set up:
ALTER FUNCTION [dbo].[Split] (#sep char(1), #s varchar(8000))
RETURNS table
AS
RETURN (
WITH splitter_cte AS (
SELECT CHARINDEX(#sep, #s) as pos, 0 as lastPos
UNION ALL
SELECT CHARINDEX(#sep, #s, pos + 1), pos
FROM splitter_cte
WHERE pos > 0
)
SELECT SUBSTRING(#s, lastPos + 1,
case when pos = 0 then 80000
else pos - lastPos -1 end) as OutputValues
FROM splitter_cte
)
)
How can we use zero's in prefix of the number column feedback_refno like
select #refno = '0001'
i need to insert this value into that column feedback_refno but it is inserting like 1 only..but i need those prefix before those 1
I have tried like this
declare #refno int
select max(feedback_refno)+1 from EDK_Customer_Feedback(nolock)
if not exists(select feedback_refno from EDK_Customer_Feedback(nolock))
Begin
select #refno = '0001'
end
else
Begin
select #refno
End
insert into EDK_Customer_Feedback values(#refno)
I need the result like 0002 then 0003 like that but it is giving like 2 then 3..
Any suggestion?
try this
SELECT RIGHT('000'+ CONVERT(varchar,feedback_refno),4) AS NUM FROM EDK_Customer_Feedback;
#refnois of type int, so leading zeros wont work. If you change it to varchar(4) you can use these two answers:
In SQL Server 2000 how do you add 0's to beginning of number to fill nchar(n)
In SQL Server 2000 how do you add {n} number of 0's to a nchar(n)?