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

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Index on a query with order

I have the following table with >1M rows: CREATE TABLE `wishlist_place` ( `id` int(11) NOT NULL AUTO_INCREMENT, `wishlist_id` int(11) DEFAULT NULL, `place_id` int(11) DEFAULT NULL, `city_id` ...
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59 views

Is index like key(timetime) usable when we query: SELECT * … ORDER BY timetime DESC

When we index a timestamp field like timetime. Can we use it for ORDER BY timetime DESC or is it just usable for ORDER BY timetime ASC OR ORDER BY timetime? Does mySQL use this index when doing vise ...
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40 views

MySQL ORDER SELECT based on a score

I have a table 'member' and want to be able to search the table and order results by relevance. I have a single string to search on and want to search multiple fields. Example, given_name and ...
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77 views

How to order by Levenshtein distance?

I want to order a table according to a char field using Levenshtein distance or similar because some entries may contain underscores or grammar errors. It is a table with all the books I plan to read ...
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192 views

Duplicate records on joining

I have two tables books and books_data. books can have multiple books_data, books_data can have only one book. books_data table has date column by which I want to sort the books table. When trying to ...
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52 views

Order result by number of occurence of a word in a text

I am working with sqlite3/python . I would like to order results by the number of occurence of %@% in text. For exemple Jimmy 10 // Jimmy wrote 10 strings like %@% James 2 Sophia 0 ..etc The ...
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37 views

Sorting by a field in child table

There are two tables: contract (with primary key contractid) and contractupdate (with field contractid referring to a contract). contractupdate also has DATE field startdate and TINYINT field day. I ...
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101 views

How to arrange rows selected in MYSQL query?

I'm fetching data from a table "TABLE_A", it's having Primary Key as "PK_ONE" (which is unsigned INT) . I'm fetching data from "TABLE_A" with where clause on PK_ONE ; Ex: SELECT PK_ONE from TABLE_A ...
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Index for ORDER BY on aggregate in MySQL

I'm working with the following query: SELECT *, SUM(entries_count) AS entries_count FROM leads WHERE promo_id IN (1, 2, 3) GROUP BY user_id ORDER BY entries_count DESC LIMIT 25 OFFSET 100; It's ...
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761 views

How can I join two tables while filtering the results with a“ WHERE IN” clause? [closed]

What I am trying to do is set up a selection filter for a cascading list on my site. When I say selection filter, I mean I am trying to limit, and sort the results based on what the user selects. I ...
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391 views

Postgresql table with one integer column, sorted index, with duplicate primary key

I want to have a table in PostgreSQL with these properties: One column with an integer Allow duplicates in this column. Duplicates will be rare. Duplicates have no meaning logically and will be ...
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646 views

Mysql: order by field or select union?

As a newbie, I expected Mysql to return the rows of this query ordered by their ids order in the id clause select * from test where id in (3,1,2) Unfortunatelly for me, that's not true. The results ...
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Performance hits with MySQL Left Joins and Order By

There are a lot of questions out there regarding this issue, but most answers seem to be very case-specific. I've tried to make this general so it'll help others too. The Issue We have a smallish ...
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1answer
42 views

How to sort query filename output like Windows explorer?

i would like to order my query output the way Windows Explorer does. First special characters like _, then the numbers, and the letters last. _ttt.bmp 0.gif bbb.png
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23 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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51 views

Slow MySQL Query when Ordering

This query takes around 2 seconds when the order by is included, without the order it takes less than a tenth of a second. The field that is doing the sorting, qc_products.addedDate, is an index and ...
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1answer
57 views

Order by one column inside other column

I've a MySQL table that looks like the following: http://sqlfiddle.com/#!2/ca67ac/1 I use it to build a grid where i put my content. The resultant is this: I've to render every row separatelly ...
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25 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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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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2answers
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Sorting of results is slow some times but fast at other times

I have a mysql query that is joining a few tables and then uses order by field for sorting. It sometimes runs quite fast at other times it is slow. While it was slow i profiled the query to find that ...
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32 views

Which of these two queries is better - can be optimized more?

With regards to the usage of the IF statement, which is better to use? Query #1: SELECT whatever FROM auctions AS a LEFT JOIN ............... WHERE ............... ORDER BY ...
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Running an “ORDER BY CASE” query on MySQL view breaks it afterwards

Whenever I create a MySQL view and then run a query ordering the results with ORDER BY CASE WHEN (...), the view becomes unusable. The newly created view works properly and all SQL is correct. This ...
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Using an enum as part of an index definition

When I use an ENUM column in a table the ORDER BY uses the ordinal of the ENUM not its value. I wasn't aware of that. So my question is what are the subtle issues when an ENUM is part of an index ...
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Slow query with ORDER BY with index created (more than 4mins on 0.6million records

I ran into a very weird query performance situation. If I run this query without order by, it finish in millsecs, with order by, it ends up with more than 4mins. EXPLAIN SELECT `book_book`.`id`, ...
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Fetching Recently added rows from table [closed]

I have the following table structure , name || description || timestamp varchar varchar date time stamp column consists of time the row is added Now i need to fetch the ...
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1answer
40 views

Ordering of rows with different kinds of objects

I have a table of real estate objects. The objects are shown in three lists (sell, rent long, rent short), each object in exactly one list (defined by an ENUM field). I want to add field seq INT to ...
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1answer
36 views

List two columns - MYSQL [closed]

i have a table like this: cp1 | cp2 ----------- A | 5 A | 1 A | 1 B | 3 C | 4 and i want to create a query like this: cp1 | cp2 ----------- A | 5 A | 1 ...
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1answer
473 views

How to prevent duplicated records when applying ORDER BY NEWID() to fetch them randomly? [closed]

I tried using the solution provided in http://stackoverflow.com/questions/1117761/sql-query-to-return-rows-in-random-order to fetch random records in my query. But I have to add NEWID() to the list of ...