GROUP BY : SQL Aggregation for Common Values

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GROUP BY multiple columns

I'm trying to draw stats out of a table and depending on the increment, group them by year, month, date. The table is as follows CREATE TABLE `channel_stats` ( `channel_id` int(10) unsigned ...
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88 views

sqlite group_concat error while executing query

I have table: CREATE TABLE www ( Col_1 VARCHAR, Col_2 VARCHAR ); select count(*) from www; --1496 And I have error: "Error while executing query: aggregate function are not allowed in ...
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1answer
90 views

Selecting most recent date when dates are stored in another table

Working in a MySQL database, I have tables set up like this: Table song_instances has song_id (int), meeting_instance_id (int) The meeting_instances table has columns meeting_instance_id (int), ...
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63 views

How to do a 'SUM' of a COUNT(*) in your select to be grouped by a particular column in SQL SERVER

What I am looking for is to be able to SUM the open_lines and group them by that so instead of 'cntnr_id' having open_lines showing as '1' it should show '2' since it is the same cntnr_id and ...
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34 views

Group-by in an Oracle database

on an Oracle database. If I make an: select id,id_operator,denumire,cod_fiscal,loc_den,str from rap where is_punct_lucru=1 and id_operator in ( select id_operator from rap where ...
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53 views

GROUP BY very slow when returning many rows

I have a query to aggregate data per day. When I run the query for a single day it is very fast. However, when I run the query for multiple days the time cost increases much faster than ...
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37 views

mysql Quiz leaderboard filter by points, time taken

I have a quiz report table which shows a report for every quiz a user takes. I need to create a leaderboard from this, which shows the top users best score, filtering by points and then time taken. ...
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1answer
19 views

How to remove some data not needed on new row from mysql query with rollup

Hello I have a problem with the rollup mysql query. I want to get total of each column. I use mysql SUM() and ROLLUP to get the result. But on the new row that is added it copies the data of the last ...
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1answer
15 views

GROUP BY parentId and MAX childId

My tables are below: crm_conversions crm_messages_of_conversions crm_receivers_of_messages I want to get all of conversions of an user with only last message. I'm trying to get with the query: ...
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75 views

How to use a group by in inner join

I have Two tables Table 1 ID totalamount 100 1000 101 500 Table 2 ID Individualamount 100 500 100 300 100 100 101 ...
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1answer
64 views

Getting sum result for last year divided quarterly

I am trying to get financial data grouped by each quarter of last year and also grouped by the last three weeks. Also, if it is possible, I want to have the type as a separate column with the type as ...
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1answer
26 views

Filter and then sort products by availability

I have table with products. Each product can be avaible in 1+ suppliers, so product can be present multiple times. products - id_productSupplier (primary key) - id_product (foreign key) - ...
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27 views

MySQL order of query

My query return like this. 12 14 14 99 78 78 54 I want result to be sorted so that no same number comes consecutively in the result. The result that I want is like this. 12 14 99 14 78 54 78
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123 views

Select latest record for each ID

I have three tables that contains data as below: Users Id Name Other_Columns --------------------------- 1 John Blah 2 Ricky Blah 3 Stella Blah 4 Bob Blah Saldo Id ...
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63 views

Is it possible to get seek based parallel plan for distinct/group by?

An example from this question shows that SQL Server will choose a full index scan to solve a query like this: select distinct [typeName] from [types] Where [typeName] has a non-clustered, ...
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Problems Calculating and Grouping Results Accurately with timediff

Query Function time_to_sec (TIMEDIFF(ohrm_attendance_record.punch_out_user_time,ohrm_attendance_record.punch_in_user_time))/3600 AS time_to_sec_TIMEDIFF_ohrm Results should total to 4.35 Right? but ...
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125 views

Simple avg query on large table much slower in PostgreSQL than SQL Server

I have a database with three tables items, parameters and measurements in both servers and want to query the measuerment table. But the query is much slower in PostgeSQL (9.4) vs SQL Server (2012). ...
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145 views

How to index for a group by with columns from different tables?

Is it possible to create an index from columns of 2 different tables? If not, how do we optimize a query that does a group by on columns of 2 different tables? For example: the following ...
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0answers
314 views

MySQL GROUP BY and ORDER BY giving inconsistent results

I'm currently working with WordPress, and I've added a new meta value which is a number between 0 and 30. Zero is ignored and up to 30 need to be organised in order and only the latest (based on the ...
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31 views

Get last updated date and group by in mysql

trans_id | item_id | price | last_updated 01 |001 | 100 | 2015-01-01 02 |002 | 200 | 2015-01-02 03 |001 | 150 | 2015-01-03 03 |003 | 200 | ...
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84 views

Slow query over 10mil rows with group by on indexed column

I've got a slow query which I want to optimize. SELECT pand.bouwjaar AS construction_date, count(*) FROM pand AS pand WHERE pand.begindatumtijdvakgeldigheid <= 'now'::text::timestamp ...
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147 views

I want to rewrite my MySQL query so that FIND_IN_SET doesn't do a full table scan unless necessary

I want to rewrite my MySQL query so that the last table join doesn't do a full table scan unless necessary. Here's what I mean. Under certain conditions I don't need to select any rows in that join ...
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54 views

MySQL - Group By - How does it determine which row to return from joined table

I am getting desired, but inexplicable behavior on a particular query, and wanted to get more information before pushing up. I have 3 tables: foo bar bar_image And paring back all distractors, ...
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27 views

MySQL GROUP BY performance not improved by 1-column vs 2-column condition

mySQL 5.6.22 on 32GB RAM CentOS I was very surprised that this change did not improve GROUP BY performance. It's a query with multiple joins, of course run with SQL_NO_CACHE option. In my original ...
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55 views

Sum of nested group query

I'm very new to SQL, so please bear suggest improvements anywhere. I have a PaymentsReceived table like this (simplified to only what is relevant) AccountID refrerences Accounts(ID) PaymentDate ...
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53 views

Mysql sum of column group by question

I have the results of a select that I am joining on that I need to get a slightly complex sum of a column from. I need the sum of result grouped on id PLUS the sum of result of any row where ...
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84 views

mysql select latest per group using 2 different tables along with self join

I have a query SQL Fiddle which contains 2 tables tbl_data CREATE TABLE tbl_data ( id int(10) unsigned NOT NULL, type varchar(32) NOT NULL DEFAULT '', title varchar(255) NOT NULL DEFAULT ...
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373 views

group by and order by making query very slow in mysql?

Query works fast: select SQL_NO_CACHE users.id, users.name from useres left join user_statistics on users.id = user_statistics.user_id where users.is_deleted = 0 group by users.id ...
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53 views

Is it possible to group by a fraction of the result set?

I have a database of products with prices. What I'd like to be able to do is figure out 5 different price ranges such that each range, when ordered by price, will have approximately the same number of ...
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95 views

How can I number my groups using an Access “Find Duplicates” Query?

I have a query created by the MS Access 2010 find duplicates wizard. It is: SELECT * FROM fbExpenses WHERE [expense_date] In (SELECT [expense_date] FROM [fbExpenses] As ...
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179 views

is it good to add index on column used in group by clause?

I have a query like- select x, sum(y) from xyz where z>=100 group by x order by sum(y) desc; will it be faster if I am going to add index on x?
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can this mysql query be optimized further?

I have this query select counterparty_id, max(id) max_id from client_administrations where counterparty_type = 1 and effective_on <= '2013-10-22' group by counterparty_id When I ...