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• How can this SQL be wrong? What am I not seeing?

  - by ropstah

  Can anybody please spot my error, this should be a legal query in SQL shouldn't it?? Unknown column u.usr_auto_key in the ON clause This is the database schema: User: (usr_auto_key, name, etc...) Setting: (set_auto_key, name etc..) User_Setting: (usr_auto_key, set_auto_key, value) And this is the query... SELECT `u`.`usr_auto_key` AS `u__usr_auto_key`, `s`.`set_auto_key` AS `s__set_auto_key`, `u2`.`usr_auto_key` AS `u2__usr_auto_key`, `u2`.`set_auto_key` AS `u2__set_auto_key`, `u2`.`value` AS `u2__value` FROM `User` `u`, `Setting` `s` LEFT JOIN `User_Setting` `u2` ON `u`.`usr_auto_key` = `u2`.`usr_auto_key` WHERE (`s`.`sct_auto_key` = 1 AND `u`.`usr_auto_key` = 1 AND admin_property is null)

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• How to get latest files in C#

  - by Newbie

  I have some files with same name but with different dates. Basically we are finding the files with most recent dates The file patterns are <FileNames><YYYYMMDD><FileExtension> e.g. test_20100506.xls indicates <FileNames> = test_ <YYYYMMDD> = 20100506 <FileExtension> = .xls Now in the source folder, the files are standardization_20100503.xls, standardization_20100504.xls, standardization_20100305.xls, replacement_20100505.xls As can be seen that, standardization_.xls are 3 in numbers but replacement_.xls is only 1. The output will be a list of file names whose content will be standardization_20100504.xls and replacement_20100505.xls Because among all the standardization_.xls is the most recent one and replacement_.xls is also the same. I have tried with my own logic but somehow failed. My idea is as under private static void GetLatestFiles(ref List<FileInfo> validFiles) { List<FileInfo> validFilesTemp = new List<FileInfo>(); for (int i = 0; i < validFiles.Count; i++) { for (int j = i+1; j < validFiles.Count; j++) { string getFileTextX = ExtractText(validFiles[i].Name); string getFileTextY = ExtractText(validFiles[j].Name); if (getFileTextX == getFileTextY) { int getFileDatesX = Convert.ToInt32(ExtractNumbers(validFiles[i].Name)); int getFileDatesY = Convert.ToInt32(ExtractNumbers(validFiles[j].Name)); if (getFileDatesX > getFileDatesY) { validFilesTemp.Add(validFiles[i]); } else { validFilesTemp.Add(validFiles[j]); } } } } validFiles.Clear(); validFiles = validFilesTemp; } The ExtractNumbers is: public static string ExtractNumbers(string expr) { return string.Join(null, System.Text.RegularExpressions.Regex.Split(expr, "[^\\d]")); } and the ExtractText is public static string ExtractText(string expr) { return string.Join(null, System.Text.RegularExpressions.Regex.Split(expr, "[\\d]")); } I am using c#3.0 and framework 3.5 Help needed .. it's very urgent Thanks .

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• How to use Regular Expression to extract information from a HTML webpage?

  - by user569248

  How to use Regular Expression to extract the answer "Here is the answer" from a HTML webpage like this? <b>Last Question:</b> <b>Here is the answer</b> ..:: Update ::.. Thanks everybody! Here is my solution by using BeautifulSoup since I'm using Python framework: response = opener.open(url) the_page = response.read() soup = BeautifulSoup(''.join(the_page)) paraText1 = soup.body.find('div', 'div_id', text = u'Last Question:') if paraText1: answer = paraText1.next

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• Hibernate reverse engineering

  - by EugeneP

  I have a structure where the main table is USER, other tables include CATEGORY (contains user_id). What I got after the standard reverse engineering procedure was: the class User contained a collection of categories, the class Category didn't contain the foreign key (user_id) but it did contain the User object. Why did it not contain the foreign key as a class property? And how do I join these two tables in HQL without that glue? HQL - please explain this part.

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• MySql mutliple tables

  - by Chris Harrison

  I've been looking into JOIN, subqueries and other ways of doing this, but I can't work out the best way to do this is... I have a table (ps_category_product): id_product, id_category I want to perform a query on it like: SELECT id_product FROM ps_category_product WHERE id_category='$this_cat' BUT, I only want to perform this query where the ID's are returned by a query on another table (ps_product): id_product, active SELECT id_product FROM ps_product WHERE active='1' Can anyone help me with getting these two queries working together?

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• nested sql statements

  - by Hadad

  Hello, I've a self join table when I delete or update it's id I want to delete or update all the direct and indirect affected records SQL server does not allow this type of cycle cascading I've decided to use triggers but this triggers will file recursively and they will be terminated at 34 level and I don't know the depth of records and event I disable the trigger and re enable it after completing the process how can I construct a SQL statement that achieve this logic?

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• Assign query results to MySQL variable

  - by 5un5

  I'm querying a big mysql database with only read privileges, and I'd like to set some slow query results to a variable, 'foo', so I can use them again in other queries. I get, ERROR 1193 (HY000): Unknown system variable '$foo' when I enter: set $foo := (select * from table1 join table2 where bar = 0 group by id); Is there a way to do this with variables, since I don't have privileges to create temporary tables?

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• [C#] RegEx search for two pattern strings and cut what's between

  - by gsharp

  I'm trying to write a little SQL Helper. I have a query like this stored in a string: DECLARE @V1 INT --ignore DECLARE @V11 INT DECLARE @V12 INT --endignore DECLARE @V2 INT --ignore SELECT * FROM SampleTable INNER JOIN AnotherSampleTable ...... --endignore SELECT * From Employee ORDER BY LastName My helper method should cut everything what's between --ignore and --endignore The result string should look like: DECLARE @V1 INT DECLARE @V2 INT SELECT * From Employee ORDER BY LastName How can achieve my result with RegEx?

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• wav file manupalation

  - by kaushik

  I want get the details of the wave such as its frames into a array of integers. Using fname.getframes we can ge the properties of the frame and save in list or anything for writing into another wav or anything,but fname.getframes gives information not in integers some thing like a "/xt/x4/0w' etc.. But i want them in integer so that would be helpful for manupation and smoothening join of 2 wav files

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• Why does this SQL work in VS but not in code?

  - by acidzombie24

  The line cmd.ExecuteNonQuery(); cmd.CommandText CREATE TRIGGER subscription_trig_0 ON subscription AFTER INSERT AS UPDATE user_data SET msg_count = msg_count + 1 FROM user_data JOIN INSERTED ON user_data.id = INSERTED.recipient; The exception: Incorrect syntax near the keyword 'TRIGGER'. Then using VS 2010, connected to the very same file (a mdf file) i run the query above and i get a success message.

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• Parsing complicated query parameters

  - by Will

  My Python server receives jobs that contain a list of the items to act against, rather like a search query term; an example input: (Customer:24 OR Customer:24 OR (Group:NW NOT Customer:26)) To complicate matters, customers can join and leave groups at any time, and the job should be updated live when this happens. How is best to parse, apply and store (in my RDBMS) this kind of list of constraints?

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• Getting a substring in Ruby by x number of chars

  - by wotaskd

  I'm trying to produce some Ruby code that will take a string and return a new one, with a number x number of characters removed from its end - these can be actual letters, numbers, spaces etc. Ex: given the following string a_string = "a1wer4zx" I need a simple way to get the same string, minus - say - the 3 last digits. In the case above, that would be "a1wer". The way I'm doing it right now seems very convoluted: an_array = a_string.split(//,(a_string.length-2)) an_array.pop new_string = an_array.join Any ideas?

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• SQL Query to return both distinct and total logins from a login table in sql2005

  - by Prescott

  Hey all, I have a table Logins { Id, AccessTime }, I'd like to write a query that returns 3 columns, Total Logins during a time period, Unique Logins for a time period, and the Id of the user. I know I could do this with two passes and a join, is there a better way to do it in a single pass? Thanks, ~P

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• Returning Null values with COUNT

  - by Randy B.

  With this query, I get a result that is two short of the table because they are not included in count, and I would like get the NULL values in the result. To do this, I am pretty sure I need to use a subquery of some kind, but I am not sure how, since the attribute in question is an aggregate. SELECT Equipment.SerialNo , Name, COUNT(Assignment.SerialNo) FROM Equipment INNER JOIN Assignment ON Assignment.SerialNo = Equipment.SerialNo GROUP BY Equipment.SerialNo, Name

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• MySQL One to Many order by number found in joined table

  - by Finbarr

  Two tables: table_a ------- table_a_id: (primary, int) table_b ------- table_a_id: (index, int, from table_a) table_b_value: (varchar) A one to many relationship between table_a_id and table_b_value. Given a query like this: SELECT DISTINCT(table_a_id) FROM table_a JOIN table_b ON table_a.table_a_id=table_b.table_a_id I want to order by the number of occurrences of table_a_id in table_b. I'm not really sure how to write this in MySQL.

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• Conversion failed when converting the varchar value to data type int

  - by desi

  *I have a varchar(1000) column declared as field that contains all numbers, as shown below. And I want to execute the following script. I need this to work please Declare @PostalCode varchar(1000)=0 set @PostalCode ='7005036,7004168,7002314,7001188,6998955' Select hl.* From CountryLocation cl INNER JOIN refPostalCodes pc ON pc.PostalCode = hl.PostalCode where pc.Postalcode in (@PostalCode) and pc.notDeleted = 1

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• I want to read a big text file

  - by Rozer

  I want to read a big text file, what i decided to create four threads and read 25% of file by each one. and then join them. but its not more impressive. can any one tell me can i use concurrent programming for the same. as my file structure have some data as name contact compnay policyname policynumber uniqueno and I want to put all data in hashmap at last. thanks

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• Why can't I SELECT a parent field that doesn't have a child?

  - by myaccount

  (rest_branches) is the table of restaurants. (phone_numbers) is another table which contains the restaurants phone_numbers, and it has a field called (branch_id) which references the restaurant id. When I try: SELECT * FROM rest_branches NATURAL JOIN phone_numbers I only get the restaurants which have a phone_number. What should I do to get all restaurants even if they don't have a phone number?

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• mysql extra columns with same name from two tables

  - by salmane

  Table 1 has columns : entry_id user_id ... Table 2 has columns : entry_id user_id ... the user_id entry is not always the same so I would like to extract both of them so I can later on compare them in my script SELECT * FROM table1 as t1 INNER JOIN table2 as t2 on t1.entry_id=t2.entry_id WHERE t1.user_id='%s' I would like to extract t1.user_id and t2.user_id ...the problem is the result array has only user_id thank you

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• "Ambiguous column name" error on one particular server

  - by jazbit

  This simple query throws the "Ambiguous column name TaskID" error on one db-server only. This is ridiculous. We tested this with the same database structure on different servers and different versions of ms sql (2005/2008), and it's only THIS particular client's server that throws the error. I'm actually frustrated. SELECT Tasks.TaskID FROM Tasks INNER JOIN TaskHelpers ON TaskHelpers.TaskID = Tasks.TaskID order by TaskID Yes, I know I can put "Tasks.TaskID" into the order by clause, but for some reasons I can't.

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• difference between where and nested queries

  - by Chris H

  I'm not able to figure out the difference between these queries. I'm pretty sure that the first one is an equi-join. I'm not sure how the second one ISN'T the same as the first. The sub query in #2 selects all Ids from S, and then it returns all R's that also have those ID's, no? SELECT R.cname FROM R, S, WHERE R.Id = S.Id SELECT R.cname FROM R WHERE R.Id IN (SELECT S.Id FROM S)

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• help with sql query - in access 2007

  - by Gold

  hi i have 2 tables table items has 144602 records table A has 27721 records code in items = BAR8 in A i want to show all records that equal i try this: SELECT Items.Code, A.BAR8 FROM Items INNER JOIN A ON Items.Code = A.BAR8; and i get 28048 records !!! i need to get 27721 , how to do it ? thank's in advance

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• What would be better, (1 database + 4 tables) or (2 databases + 2 tables each) ?

  - by griseldas

  Hi there, I would like to be advised on what would be better (in regards to performance) A) 1 DATABASE with 4 tables or B) 2 DATABASES (same server), each with 2 tables. The tables size and usage are more or less similar, so the 2 tables on Database 1 would be similar usage/size to the 2 tables on database 2 The tables could have +500,000 records and the 2 tables on each database are not related (no join queries etc between them) Thanks in advance for your comments

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• How to select distinct in SQl Server 2008 but for only one field out of many?

  - by bakerjr

  I have a query: SELECT Content.content_name, Language2.Name, Language2.language_id, Content.id, Content.content_description, FROM Language AS Language2 LEFT JOIN contents AS Content ON (Language2.language_id = Content.language_id) How do I select only the distinct content_name?

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• Firebird 2.1 + EXISTS = query bug?

  - by Atlas

  Using Delphi 2009 + Firebird 2.1.3. Database is ODS 11.1, default char set is UTF8. My prepared query is as follows: SELECT a.po_id, a.po_no FROM purchase_order a WHERE EXISTS (SELECT 1 FROM sales_order_item z1 JOIN purchase_order_item z2 ON z2.so_item_id = z1.so_item_id AND z2.po_id = a.po_id WHERE z1.so_id = :soid) ORDER BY a.po_no Now when I loop this say 1000 times because I have 1000 x so_id, the CPU usage get at 100% for FBSERVER.EXE Anyone encountered this problem?

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