A clause used in SQL SELECT statements to sort query results.

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MySQL order by - one column conditional on another column

In MySQL I have a table (simplified for this question) CREATE TABLE `projects` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(255) NOT NULL, `priority` int(11) DEFAULT '1000000', ...
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4answers
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Mysql Order By affecting a Query with column alias, group by, and having

Description: I have a query with column alias, group by and having. It's getting altered when I add an order by. This strange behavior is only happening in 5.6.16 and 5.6.21 (which I was using in ...
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425 views

In PostgreSQL is there a way to rank/weigh columns so as to order the results?

Let's say I am searching through three text columns. I don't just want results that match a given word or phrase, but I also want to weigh them (column A > column B > column C) - thereby ...
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2answers
164 views

Order by sub select

I have 3 tables: articles, paragraphs, notes An article may have many paragraphs, and a paragraph may have 0 or 1 note. Now I want to find all notes belong to an article: select * from notes where ...
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1answer
80 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 ...
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1answer
102 views

Making MySQL use primary index without hinting or forcing

I have the following db structure: CREATE TABLE `question` ( `id` int(11) NOT NULL AUTO_INCREMENT, `level_id` int(11) NOT NULL, `video_id` int(11) NOT NULL, `is_active` tinyint(1) NOT NULL, ...
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1answer
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SQL Server 2005: Full-text search, order by matches

Is it possible to do a full-text search in SQL Server 2005, ordering on the number of matches? For example, let's say I have the following products for sale. Tennis Racquets Tennis Balls Footballs ...
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1answer
60 views

MySQL - Ordering 'featured' items first

I need to have the results of a query show featured items first for a given date before listing the day's other items. You can ignore the categories that are being pulled from another table. ...
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1answer
20 views

sorting output by incrementing IP in mysql

I want an incrementing list of IP #'s in a subnet to display on a php web page in a table. Right now, 10.1.2.3 would display after 10.1.2.10 in the sequence. My current query is this: SELECT * FROM ...
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1answer
83 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 ...
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1answer
55 views

MySQL Filesort/Order By Slow

I've been struggling with a query for the past few weeks and it now just appears as gobbly-gook to me when I try to optimize. The query runs - at about 2.3 seconds, but I know there has to be a more ...
2
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1answer
86 views

Operator “~<~” uses varchar_pattern_ops index while normal ORDER BY clause doesn't?

Let's say I have a table with 1 000 000 records. Structure of table is: create table individual ( id serial primary key, surname varchar(128), "name" varchar(128), patronymic ...
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1answer
1k views

Why is MySQL order by performance poor within a single partition of a partitioned table?

I have to store some sequence numbered data in MySQL. I have about 300,000 data items per day for about a 10 year span. Let's say the table structure is just sequence number (a big int) and data (a ...
2
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1answer
2k views

MySql: #1221 - Incorrect usage of UNION and ORDER BY

I have the following query which is intended to retrieve the newest 3 comments for each post in an array of posts. SELECT * FROM comment AS tbl WHERE sscm_id IN ( SELECT sscm_id FROM comment AS t1 ...
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How to order by fields of joined table while selecting for update?

For selecting some rows of table Fwt_Chipkarte for update I use the following SQL statement (IBM DB2): SELECT o.Archiviert, o.Id, o.IdComm, o.Kartennummer, o.Konto, o.LetzteAenderung, ...
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Schema for user drag and drop ordering

I'm trying to work out the schema for a system where users will be able to order items in an (unlimited length) list by drag and drop. Is there any kind of standard way of storing this ordering ...
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1answer
122 views

MySQL: Why queries with subqueries are much faster than single query?

I made few queries on my db lately First query: SELECT `table`.* FROM (`table`) WHERE table.id in(27172172,[...bunch of ids...],27171770) ORDER BY field (`table`.`id`, ...
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1answer
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weird sql server behavior when inserting and selecting

Today after one of the drives on our sql server ran out of space. The drive contained eventracker logs, so I didn't think it was a big deal, but then I noticed when I insert a record into a database, ...
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101 views

Special Oracle Order

I have a table (emp) with two columns in ORACLE: COMPANY OFFICE EMP ------------------------ 9999 00001 emp1 9999 00001 emp2 9999 00002 emp3 9999 00002 emp4 ...
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3answers
100 views

Get rows changed between two dates (latest and previous)

I have a table _sync_history with this data: +----+----------------+---------------------+ | id | object_name | sync_time | +----+----------------+---------------------+ | 1 | territory ...
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How to order by alphanumeric codes in SQL Server [closed]

I have a table with some project codes. These codes are e.g.: B001, B002, Z15001, Z14001, P003,... I need this result table: Z15001 Z15002 ... B001 B002 ... C001 C002 ... Z14099 Z14098 Z14097 ... ...
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38 views

Apply limit and conditions per grouped data

I am building an api endpoint to send statistics data that then is going to be plotted on a graph. The hardest part is being the query I need to execute. To sum up I want the first n most sold ...
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173 views

Filesort while using primary key for orderby

I have been breaking my head for the past two days now for this. CREATE TABLE `clients` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `guarantor_name` varchar(50) NOT NULL, ...
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MySql Order by isnull() Performance Problem

my sql below is use for listing stock added from 10 days ago. Order by isnull(Price) is use so that stock without any price yet will still being listed. AddDate and Price has an index. SELECT Id, ...
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How to order by 5, 501, 50101, 6, 601, 60101, etc?

I've got a list of ledger account numbers. These numbers go like this: 5 (main account, #5) 501 (sub account of main account 5, #01) 50101 (sub account of this account, #01) etc. So if I have a ...
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2answers
63 views

Get the nth distinct column value ordered by another column

I want to get the row with the nth distinct value in a column, as ordered by another column. In more real terms, I want the 1000th distinct email_address as ordered by created_at, and the ...
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2answers
27 views

Custom ORDER BY

Are there other ways to use ORDER on my results? 20150507094958A DISPOSED 2015-05-07 09:50:00.853 Samuel MONEY 20150507094958A DISPOSED 2015-05-22 09:25:00.000 Jeff AUTOMOBILES ...
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1answer
333 views

Oracle - WHY do an ORDER BY for INSERTs AS SELECT?

I have an application that was migrated from MSSQL to Oracle 11G. It needs re-design but that's outside the scope of the project. In short, the application gets legacy data, builds a parent table ...
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1answer
86 views

How to optimize multiple ORDER BYs?

I'm getting sluggish performance on a table with ~300,000 rows and B-Trees on each column. This is for a dynamic pagination page where the query is constructed on demand, and the application caches ...
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1answer
58 views

MySQL Grouping Order

Is it possible to force the order in which a result set is grouped? I have a table with multiple languages in it, and I'm doing a GROUP_CONCAT to get a comma separated list of the product name in each ...
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2answers
42 views

Order by on an alphanumerical column

I have a column that has strings of the following type: Miller 10 Allen 20 King 10 .... Jones 100 I try to sort the column based on the numerical part of the data. I tried the following: SELECT ...
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1answer
574 views

Use order from another select clause

So what I'm actually trying to achieve is filter the most voted on stories. The stories are saved in one table, and all of the votes in another one. I have this statement to get the vid column order ...
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2answers
68 views

mysql - order by first condition in where clause

I have a table consists of the following fields id, name with the following values 1, ciro 2, test ciro 3, ciprox 4, other 5, other i would like to get all the values that begin with "ci" or ...
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1answer
65 views

MySQL Update a table based on the last data from another table while grouping with conditions

I need a query to UPDATE a series of fields based on another table Table lp_plates_backup | uid | brand | model | | 1 | | | | a | Old | Error | ...
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1answer
19 views

Find the number of where statements that matched in postgresQL

Right now I have a query that looks something like this SELECT id FROM products WHERE products.details->'make' = ? OR products.details->'model' = ? OR products.details->'year' = ...
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1answer
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db INDEX on ORDER BY FIELD in very simple query does not help - still slow response?

I have very simple query which returns 200K records very slow (20 seconds). SELECT * FROM TABLE ORDER BY ID DESC If I do just SELECT * FROM TABLE it returns quick result. I created INDEX on ...
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2answers
50 views

How does ORDER BY FIELD() in MySQL work internally

I understand how ORDER BY clause works and how the FIELD() function works. What i want to understand is how the both of them work together to sort. How are the rows retrieved and how is the sort ...
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1answer
125 views

Reverse auto_increment id existing column in phpMyAdmin

I have imported csv file through phpMyAdmin into one table. I have set auto-increment field, as shown below, but of course it ordered it ascending: +----+------------+------+ | id | date | name ...
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1answer
485 views

Cassandra row ordering best practice

I have a column family that store articles. I'll need to get those articles from the most recent to the oldest, getting them from Country, and of course the ability to limit the number of fetched ...
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1answer
34 views

cant order NULL value properly (mysql)

So I got this view in mysql : CREATE VIEW vote_question_totals AS SELECT question_id , SUM((vote_question_type)='1') question_total_plus , SUM((vote_question_type)='-1') question_total_minus , ...
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1answer
147 views

increment row value does not work properly with where condition

I have created sql fiddle as below it is working fine if i remove where condition(WHERE rg.groupid= 1) output without where condition | ID | RANK | MYORDER | PREVIOUSRANK | ...
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1answer
4k views

SQL Limit + count group?

I'm tracking all the visitors of my site using this table: Visitors table In my admin panel, I have an overview of which countries visited my site, where they came from, ..., but because over 20+ ...
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1answer
71 views

ORDER BY optimization issue

I have a query: SELECT user_details.id , user_details.first_name , user_details.last_name, user_accounts.name account_name, jtl0.account_id account_id, user_details.title , ...
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1answer
294 views

GROUP_CONCAT with ORDER BY , but results are not ordered

The following query works fine SELECT *, (SELECT GROUP_CONCAT(url SEPARATOR '$$' ) FROM project_photos WHERE project_id = projects.id ORDER BY priority) AS images FROM projects WHERE catID = 2 LIMIT ...
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1answer
2k views

Slow complex query with group/order

I have a problem with a very important query in my application. It is very slow when adding group and order to it. So the full query is: SELECT m.id, m.title, m.title_text, ...
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1answer
2k views

Help optimizing MySQL slow query

i'm running a wordpress which needs some mysql optimization, i have a slow query and i would like to get rid of "Using temporary; Using filesort" query: EXPLAIN SELECT SQL_CALC_FOUND_ROWS wp_posts.* ...
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How to sort new data for display? [migrated]

I am new to SQL. I have a table called Categories with 3 columns: id int(25) category varchar(25) subcategory varchar(25) I would like to add a new subcategory "Real Estate Agency" in the category ...
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19 views

Custom cycling order in MySQL

Having following Foo table: id | name | group ===|=========|====== 1 | "John" | 1 2 | "Paul" | 1 3 | "Marry" | 1 4 | "Josh" | 1 5 | "Mike" | 2 6 | "Kevin" | 2 7 | "Ramon" | 2 8 | "Kim" ...
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PostgreSQL query slow when using tsvector and ORDER BY despite having index

Running on a large database (around 1.5G) The following query takes about 70 seconds to run, SELECT x FROM DBText x WHERE x.status = 2 AND x.publishedTime < 4574590406397 AND x.service = ...
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1answer
38 views

Am I using the ORDER BY clause incorrectly

I am trying to enumerate a database, created specifically for the purpose of learning SQL injections. I am trying to discover the number of columns a particular select statement might be using. I do ...