Upper limit to number of columns I can JOIN two tables on in MySQL?
Is there a limit to the number of columns I can JOIN two tables on in MySQL? ...
limit
MySql Query: Select top 3 rows from table for each category
I have an table with records and this table has an row called category. I have inserted to many articles and i want to select only to articles from each category. I tried to do something like this: i created an view: create view limitrows as select * from tbl_artikujt order by articleid desc limit 2 and than i created this query:S...
license key for our WAMP server
Hi, We have a WAMP server. We have to deliver it to the client and ensure that only one instance of the server can be used. We are looking for a simple protection(since any scheme can be broken). Basically, we want to limit the number of server installs to 1. Please let me know a solution that can be implemented in a short time. Thanks...
Select items that are the top N results for a related table
Say I have a game where a question is asked, people post responses which are scored, and the top 10 responses win. I have a SQL database that stores all of this information, so I might have tables such as Users, Questions, and Responses. The Responses table has foreign_keys user_id and question_id, and attribute total_score. Obviously, ...
Is there any limit on number of html elements, that browser can display without problems?
Basically I've got a huge table, which gets even bigger as user scrolls down (auto preloading subsequent rows). At some point browser becomes sluggish, it starts to hang for a moment as I click around or try to scroll and more sluggish it becomes, the more rows it gets. I wonder if there is any limit on number of elements that page can h...
Is it possible to add WHERE clauses when retrieving relationships?
In doctrine, is it possible to add a WHERE clause when fetching a property of an object that corresponds to a relationship? In terms of concept, let's say I want to retrieve only the first 3 blog posts made in the last 5 days. My "blog" object has a "posts" property which is defined as a relationship. Update... As some people are hav...
:limit number of rows found in a collect (has_many association)
Category has_many :products has_many :deals, :through => :products Product has_many :deals I want to display a limited number of deals on a category page. In categories_helper.rb: def deals @category.products.collect { |c| c.deals}.flatten end In the show.html.erb (Category): <% for deal in deals %> <%= deal.name %> <% en...
Why im getting wrong number of rows when using group by, limit and group_concat in mysql?
Hi everybody, i'm doing a query where i want retrieve some records when i do the query without 'limit' the result returns me the correct number of rows, but when i use limit the result returns me the half of the rows. the query im using is something like this: SELECT WGI_TaxoName.ScientificName, WGI_Locality.Locality, IFNULL(C...
Why does preg_match_all poop out after so many characters?
I'm having a problem with my preg_match_all statement. It's been working perfectly as I've been typing out an article but all of a sudden after it passed a certain length is stopped working all together. Is this a known issue with the function that it just doesn't do anything after so many characters? $number = preg_match_all("/(<!-- ([...
How to get the number of rows that would have been returned?
In the following query: SELECT column1,column2 FROM table1 ORDER BY column1 LIMIT 0,30 How can I find out the number of rows that would have been returned were it not for the LIMIT? Edit: I am looking for a way to work this into the query above and not do a separate query. (If possible.) ...
Receive Email address count limit in app engine
Hi, My mail is regarding the option for receiving email to any address which looks like - [email protected] documented here: http://code.google.com/appengine/docs/python/mail/receivingmail.html My questions are: Is there any restriction on the number of email addresses which can be created using the above format and used insi...
Select results from the middle of a sorted list?
I've got a simple table with 300 rows, and after ordering them I want to select rows 11-50. Do I limit by 50 and remove the top 10 rows somehow? ...
Sqlite LIMIT / OFFSET query doubt
Hello, I have simple question with Sqlite. What is the difference between this: Select * from Animals LIMIT 100 OFFSET 50 and Select * from Animals LIMIT 100,50 thanks in advance ...
SQL Server: Select Max Limit 1 from Group
Using SQL Server. Ok, I'm making an in webpage cache system. I wanted to make a simple page rank system along with output. The problem is, I want to display the recordset with the highest relevance score per unique domain. One domain may have multiple records but with different titles, descriptions, etc. he probem is,instead of getting 1...
Limit Threads count
Hello, I have a List with items that I want to download. I use a for Loop to iterate the list. For each item in this List I start a new Thread that references the item. My Problem is that I want limit the maxDownload at the same time. for (int i = downloadList.Count - 1; i >= 0; i--) { downloadItem item = downloadList[i]; if (...
SQL LIMIT return 'zero' - 0 - rows(IN PHP)
Hello, I have an error in this query, when the query returns zero rows. Error Number: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-20,20' at line 3 SELECT pl.name,pl.email FROM players pl JOIN players_bonus pl_b on pl.id = pl_b.id_player WH...
Get the top row after order by in Oracle Subquery
I have a table student(id, name, department, age, score). I want to find the youngest student who has the highest(among the youngest students) score of each department. In SQL Server, I can use following SQL. select * from student s1 where s1.id in (select s2.id from student s2 where s2.department = s1.department order by age asc, sc...
Limit JOIN query on specific table
Hi there, I'm trying to perform a select query over two tables, one containing, for example, products, and the other containing the colors that can be chosen for those products. Each product has a different number of colors that can be chosen; some have only one color, others can have 20 of them. The scope of the query is to parse a l...
Can I limit the length of text in a JTextField which can be painted, while still storing the full text?
I have a text field in my application. Despite it being a text field, users sometimes paste huge amounts of text into it. Additionally, other functions of the problem set large amounts in as well. Sometimes there is so much text that the JVM gets an access violation in fontmanager.dll. Oracle doesn't appear to be interested in fixing...
limit search suggestions in android QSB
Is there any way to limit the number of search suggestions that shows up in the QSB for my app? I see the 'clearHistory()' method but What i'd like to do is have the suggestions just be limited to say 5 previous searches, is this possible? ...