Combining multiple data points into a single data point. This usually is used in reference to SQL and usually to an aggregate function of some sort.

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3
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1answer
5k views

GROUP BY and ORDER BY problem

I have two tables like this: CREATE TABLE cmap5 ( name varchar(2000), lexemes tsquery ); and CREATE TABLE IF NOT EXISTS synonyms_all_gin_tsvcolumn ( cid int NOT NULL, -- ...
3
votes
1answer
149 views

Aggregating statistics from child rows

I have a parent row and then many child rows, and I must aggregate statistics from these child rows. For a more concrete example let's imagine I have one round of golf (parent row) and then child ...
3
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2answers
14k views

SQL query that concatenate values from duplicate rows in a single table

Lets say I have a table of employees, like this: Name Sex Role Bob M Developer Joe M QA Now, I have a problem with this table of duplicated rows. I will fix it ...
3
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1answer
218 views

Grouping() equivalent in PostgreSQL?

I have a SQL query that runs in MS SQL Server and it has grouping(), rank() and rollup() functions / keywords in it. The query is given below. How can this be translated to PostgreSQL? select top ...
3
votes
1answer
188 views

Decode and aggregate a BitMask in t-sql

I have a table that contains a bitmask field that stores permissions, where each bit denotes whether a particular permission is granted or not. Here's a simplified example: DECLARE @T TABLE (id ...
3
votes
1answer
628 views

Is it possible to make a reference to the result of an aggregate function in a SELECT clause from the same SELECT clause?

I'm not a Database Administrator--just a Software Engineer. I would like to know if it is possible to reduce the following T-SQL query: SELECT SUM(Price * Quantity) as 'Total', SUM(Price * ...
3
votes
2answers
38 views

Get rows with minimum value

I have tables company: company_id | - - - - - - - - - - - - - - 1 | 2 | employee: employee_id | - - - - - - - - - - - - 1 ...
3
votes
1answer
547 views

Avoid joining to the same table multiple times

I have two tables: CREATE TABLE one ( id int4 primary key, p_id int4, k_id int4, c_id int4 ); CREATE TABLE two( id int4 primary key, p_id int4, k_id int4, t_id int4, pos int4 ); Table ...
3
votes
1answer
845 views

How to represent aggregates in a data warehouse

I am building the dimensional model for a data warehouse (as an exercise for a mini-course I am doing) and I want to build an aggregate to speed up queries. Basically, I want the aggregate to group ...
3
votes
1answer
57 views

Extend a single week's win/loss ratio calculation to a whole season

I'm quite inexperienced at SQL, and I'm trying to improve a query in a small project. The database schema looks somewhat like this. (I've reduced to relevant information, if there seems to be ...
2
votes
3answers
334 views

Non-deterministic aggregated result

Why is my query non-deterministic? I have query that do the following: select sum(float1*float2*coalesce(float3,1)) from table When I run this query I get a deterministic result, but it seems not ...
2
votes
3answers
6k views

Why MAX() of SUM() giving wrong output?

I have a table employee id name salary city 1 ram 50000 c1 2 sham 20000 c2 3 jadu 80000 c1 4 madhu 90000 c4 5 hari 10000 c2 6 gopal 34000 c3 7 ...
2
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1answer
6k views

Postgres error [column must appear in the GROUP BY clause or be used in an aggregate function] when sub query is used

I have two tables employee and phones. An employee can have 0 to n phone numbers. I want to list the employee names with their phone numbers. I am using the below query which runs fine. SELECT ...
2
votes
3answers
2k views

Return total number of rows and selected (aggregated) data

I have a function which is selecting some data from a table. I would like to return the selected data and the total number of rows in that table. How can I do that or how can I get the same result in ...
2
votes
2answers
2k views

Return counts for multiple ranges in a single SELECT statement

I have a Postgres database table foo that, among other things, has a column for score that ranges from 0 - 10. I want a query to return the total number of scores, the number of scores between 0 and ...
2
votes
3answers
204 views

Can I perform a MAX over a pair of columns?

I would like to execute the following: SELECT person, MAX( (date, priority) ) FROM table GROUP BY person; It would return a person, date and priority row for each distinct value in the person ...
2
votes
1answer
1k views

PostgreSQL Division In Query Not Working

So I am having a really off day or something, but for the life of me I can not figure this out. I am trying to divide tier1 by total to get a percentage of the total. I thought like this: (tier1 / ...
2
votes
1answer
81 views

What is the appropriate SQL method for “Safe to SUM”?

In SQL Server 2008 R2+ we, unfortunately, have some nvarchar columns storing numeric data. In some cases we want to SUM the data when it can be summed. The problem is that ISNUMERIC() returns 1 for a ...
2
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2answers
117 views

Postgresql: Pattern match against array elements?

Is there any way to do a pattern match against the elements of an array in postgresql (9.4 if the version makes a difference)? I have an aggregate function that, among other things, returns an array ...
2
votes
3answers
146 views

Aggregate query with min

Having a product_stock table with following structure: product_id warehouse_id stock price Which has bunch of records (same product can be in different warehouses): 1, 1, 0, 500 1, 2, 5, 505 1, 3, ...
2
votes
3answers
599 views

Rolling count of total transactions over time

I need to get a set of total transactions over time on a weekly interval. Essentially I need a total-transactions-to-date column. When I group by WEEK(Date) I get the amount of transactions for that ...
2
votes
1answer
285 views

Select data based on records created_at column

I have two tables Keywords, ProjectReports: http://sqlfiddle.com/#!15/06ae3/1 As you can see in that example everything works fine, but I want to get more data from those 2 tables and I don't know ...
2
votes
1answer
914 views

Why use custom CLR aggregate functions for string concatenation and geometry unions in SQL Server?

I often need to do string concatenation or geometry unions over a column in SQL Server 2008 and I'm aware that you can write custom aggregate functions in .NET and register them with SQL Server to do ...
2
votes
1answer
965 views

Calculate percentage of false records to total records within a aggregate function

I'm looking for a solution to calculate a percentage rate of a boolean value: Model: Products 1 <-> n Components Components.essential is a boolean attribute What I want to calculate ...
2
votes
1answer
201 views

Why is ORDER BY LIMIT 1 so much faster than MAX?

Here are my two queries: select sts_in from sta_session where sts_user_id=2006 AND sts_sessid!='0jitkt80gg3avere03tqk4lhi6' order by sts_in desc limit 1; And select max(sts_in) from ...
2
votes
1answer
34 views

Search for authors whose records are separated by at least X days

I am using Postgres and have a table which contains metadata about several million images - many of which have the same author. I am looking for contributors who add content regularly - not people ...
2
votes
1answer
531 views

Select query for returning different data based on creation time

I have a view, which will Select data from table reports the select will filter the data based on multiple dates. reports table: id, key_id, position, created_at My select: pr.key_id, ...
2
votes
1answer
1k views

Is it possible to reduce a group to a row based on some criteria?

I'd like to perform a select on a table involving a GROUP BY such that all rows that share the same set of identifiers are grouped together, but I want to reduce the group to one of the grouped rows ...
2
votes
1answer
485 views

I have multiple sources INSERTing into a MySQL innodb table. My periodic aggregation script never makes accurate aggregates. Why?

I apologize in advance if this is a repeat. I'm not really sure how to properly ask for what I'm running into. I have a large InnoDB table set up. I have 3 sources that all INSERT concurrently at a ...
2
votes
1answer
424 views

Group activities in activity feed by users and products

On my website I'm building an activity feed where I got the basics done and are now making some improvements here and there. One of them is the grouping. I've built it so that if multiple users buys ...
2
votes
1answer
90 views

How can I get hours worked totaled for a column?

I get good results until I try to perform calculations on an alias column. I am aware that that is not possible. However I need a breakthrough. Can someone lend a hand please :) I have to finish this ...
2
votes
1answer
104 views

ORA-00937 when calculating a sub-value in an aggregate select statement

The problem described below applies to Oracle 11g databases. I also tested the statements on MySQL and PostgreSQL with no problems of the kind mentioned in this question. I want to use an ...
2
votes
1answer
643 views

Calculating a running balance to store with transactions

I need to put a read-only copy of balance and transaction data from a legacy system, which will only be used to view/print statements. Balance | id | member_id | product_id | balance | | 1 | ...
2
votes
1answer
2k views

SQL hourly data aggregation in postgresql

I am a newbie with database so I'm seeking your help with this one. I have a table containing time series data. 2012/01/01 00:10, 10 2012/01/01 00:30, 5 2012/01/01 01:00, 10 2012/01/01 01:40, 10 ...
2
votes
1answer
639 views

How can I use running total aggregates in a query to output financial accumulations?

I am attempting to write a query that will be consumed by a SSRS 2012 report. Given a paid invoice, with a certain set of account allocations towards which the money paid towards it must be saved, I ...
2
votes
1answer
412 views

MongoDB: Aggregation workaround by helper collection

Since I regularly run against mongodb's document size limit and also aggregation framework's group limitations >16M, depending on the amount of data I need to process, I look for a simple workaround. ...
2
votes
1answer
706 views

Performing aggregations and calculations: SQL (CTE) vs MDX

I’ve hit a wall and would like some expert advice. I’m building a data warehouse and don’t quite understand whether the calculations (also time aggregations) should be done in SQL (T-SQL and CTE) or ...
2
votes
0answers
627 views

How to calculate running total based on dynamic values?

I need to calculate the running total in which the target column is changing along with the time. Its something which aws does. Charging based for only what you use. So how do I aggregate sum of ...
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2answers
8k views

How to select rows which have max and min of count?

I have the following table in SQL Server 2012: CREATE TABLE [MyTable] ( [Id] UNIQUEIDENTIFIER NOT NULL PRIMARY KEY DEFAULT NEWID(), [MyGroup] INT NOT NULL ); I want to output a table of the ...
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2answers
13k views

how to calculate difference of first row and last row fields value in each group

I have table with structure like this: +-------+------------------+ | Value | Date | +-------+------------------+ | 10 | 10/10/2010 10:00 | | 11 | 10/10/2010 10:15 | | 15 | ...
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4answers
5k views

Should I use the Infobright database or is there a better aggregation solution?

We are a MySQL front-end shop and have a system currently logging event data in a highly structured format. Think apache traffic log. We need to be able to aggregate counts of this data (cube) vis a ...
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4answers
86 views

Getting an aggregate (here: min) for a group of values [closed]

Example table: ID | value A | value B ---------------------- 1 | abc | 3 1 | def | 5 1 | ghi | 1 2 | cba | 9 2 | fed | 4 I want the ...
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3answers
9k views

Select query to retrieve values even if are null

I need some help in a query. Need to retrieve data from 1 table, even if one of the field has null value. Here's an example: Select name, SUM(credit) as credit From expenses Where name like ...
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vote
2answers
857 views

LIMIT to one row per ID

This query gives me multiple hits because of each assetid may contain many vb.title. How can I limit the result to only 1 hit for each assetid? 'select DISTINCT v.id, v.purchasedate, ...
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vote
2answers
296 views

PostgreSQL : avoid SUM over same values multiple times

I've a student table and a table of scores in various subjects. I want to sum score1 & score2 for each student across all subjects and then add the bonus for each student. CREATE TABLE student ( ...
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1answer
1k views

PostgreSQL: How to get a sum of values and the total rows that went into each value? [closed]

I have a table, MyData in the following format: |id|theme_id|priority_id|value| I am trying to get the following result for all the rows: theme_id | priority_id | total | sum ...
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3answers
134 views

Longest matching suffix while using aggregate functions

Background Looking to find the longest matching string suffix. Setup Consider the following fiddle: CREATE TABLE noun ("label" varchar(10)) ; INSERT INTO noun ("label") VALUES ...
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2answers
31 views

Selecting Values That Differ From Section Average

I'm attempting to select data from a table that's already been made containing records of file size as taken every twelve hours. The table looks something like this: surrogate_id | partition_id | ...
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1answer
545 views

Split two rows into two columns

I have the following table: id | name | action | count ------------------------------ 1 | Value1 | 0 | 27 1 | Value1 | 1 | 49 2 | Value2 | 0 | 7 2 | Value2 | 1 | ...
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1answer
31 views

Is it possible to find the user whose aggregated score reaches X value first?

Given this sample fiddle containing sales value and date for two users: http://sqlfiddle.com/#!2/8148be/3 How can I find the first user who has reached a total saleValue of 30 since the beginning of ...