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• Reorganizing MySQL table to multiple rows by timestamp.

  - by Ben Burleson

  OK MySQL Wizards: I have a table of position data from multiple probes defined as follows: +----------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+----------+------+-----+---------+-------+ | time | datetime | NO | | NULL | | | probe_id | char(3) | NO | | NULL | | | position | float | NO | | NULL | | +----------+----------+------+-----+---------+-------+ A simple select outputs something like this: +---------------------+----------+----------+ | time | probe_id | position | +---------------------+----------+----------+ | 2010-05-05 14:16:42 | 00A | 0.0045 | | 2010-05-05 14:16:42 | 00B | 0.0005 | | 2010-05-05 14:16:42 | 00C | 0.002 | | 2010-05-05 14:16:42 | 01A | 0 | | 2010-05-05 14:16:42 | 01B | 0.001 | | 2010-05-05 14:16:42 | 01C | 0.0025 | | 2010-05-05 14:16:43 | 00A | 0.0045 | | 2010-05-05 14:16:43 | 00B | 0.0005 | | 2010-05-05 14:16:43 | 00C | 0.002 | | 2010-05-05 14:16:43 | 01A | 0 | | . | . | . | | . | . | . | | . | . | . | +---------------------+----------+----------+ However, I'd like to output something like this: +---------------------+--------+--------+-------+-----+-------+--------+ | time | 00A | 00B | 00C | 01A | 01B | 01C | +---------------------+--------+--------+-------+-----+-------+--------+ | 2010-05-05 14:16:42 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:43 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:44 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:45 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:46 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | 2010-05-05 14:16:47 | 0.0045 | 0.0005 | 0.002 | 0 | 0.001 | 0.0025 | | . | . | . | . | . | . | . | | . | . | . | . | . | . | . | | . | . | . | . | . | . | . | +---------------------+--------+--------+-------+-----+-------+--------+ Ideally, the different probe position columns are dynamically generated based on data in the table. Is this possible, or am I pulling my hair out for nothing? I've tried GROUP BY time with GROUP_CONCAT that roughly gets the data out, but I can't separate that output into probe_id columns. mysql SELECT time, GROUP_CONCAT(probe_id), GROUP_CONCAT(position) FROM MG41 GROUP BY time LIMIT 10; +---------------------+-------------------------+------------------------------------+ | time | GROUP_CONCAT(probe_id) | GROUP_CONCAT(position) | +---------------------+-------------------------+------------------------------------+ | 2010-05-05 14:16:42 | 00A,00B,00C,01A,01B,01C | 0.0045,0.0005,0.002,0,0.001,0.0025 | | 2010-05-05 14:16:43 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:44 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:45 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:46 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:47 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:48 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:49 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:50 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | | 2010-05-05 14:16:51 | 01C,01B,01A,00C,00B,00A | 0.0025,0.001,0,0.002,0.0005,0.0045 | +---------------------+-------------------------+------------------------------------+

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• Formula to follow addition of rows

  - by Wayne McCaslin

  New to VBA, please help. I have a range say A2:D10; input causes rows to be added. New entries are being added using NextRow=_. Works perfectly, however, how do I get the formulas in columns C and D to follow each new row being added. I cannot just format entire column due to my sort criteria. Example formula is =IF(ISTEXT($B11),$C$2-$D11,"")

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• extracting only unique row from csv based on multiple column criteria ?

  - by wefwgeweg

  basically i have rows after rows of data event | venue | date | some | other | columns | here| there are lot of overlapping event that happens at same venue and date. so i would like to end up with only unique events by matching event, venue, date. is this possible in excel , how to approach this ? VBA ? or some option i dont know about ? thank you.

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• winforms - datagridview row height doesn't resize when defaultcellstyle is set to wrapmode

  - by BhejaFry

  Hi folks, i have a datagrid that displays long text on couple columns. I have set the cells defaultcellstyle to wrap. This works but now the row height doesn't change to compensate for the wrapped text & the text is getting cut-off. What am i missing? TIA

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• Saving elements to database with $.ajax()

  - by Justin Meltzer

  I'm trying to save dynamically created elements in my application.js file to the database. Would the code look something like this?: $.ajax({ type: "POST", data: { title: 'oembed.title', thumbnail_url: 'oembed.thumbnail_url'} }); Is there anything I'm missing? Assume that oembed.title and oembed.thubnail_url hold the values I want to save, and that title and thumbnail are the database columns.

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• What are my best ASP.Net GridView replacement options?

  - by Homer

  We currently use a GridView to display 1000+ rows of data. Minimum requirement for replacement is a fixed header row, fixed footer and columns would be a plus. This would have to work across IE 6 and greater. I've heard good things about Infragistics, but the demo on their page is slow. So what are my best options? jQuery? YUI? other 3rd party?

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• Help with MySQL query

  - by Michael S.

  I have a table that contains the next columns: ip(varchar 255), index(bigint 20), time(timestamp) each time something is inserted there, the time column gets current timestamp. I want to run a query that returns all the rows that have been added in the last 24 hours. This is what I try to execute: SELECT ip, index FROM users WHERE ip = 'some ip' AND TIMESTAMPDIFF(HOURS,time,NOW()) < 24 And it doesn't work. Can someone help me out? Thanks :)

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• How to Update the primary key of table which is referenced as foreign key in another table?

  - by Mobin

  Suppose a Table "Person" having columns "SSN","Name","Address" and another Table "Contacts" having "Contact_ID","Contact_Type","SSN"(primary key of Person) similarly Table "Records" having "Record_ID","Record_Type","SSN"(primary key of Person) Now i want that when i change or update SSN in person table that accordingly changes in other 2 tables. If anyone can help me with a trigger for that Or how to pass foreign key constraints for tables

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• Latex: index of symbols

  - by Daniel

  I want to create an index of symbols or notation, similar to the usual index one obtains with makeindex. I have gotten this to work, using the glossaries package. However, just as in the usual index, I would like to get two columns in the index of symbols, while glossaries puts everything under each other. Commands like twocolumn or multicol also do not work, because then the second column starts higher than the first, above the title of the index of symbols. Any suggestions?

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• SharePoint Edit Tasklist Task

  - by Oliver S

  Hi, I have SharePoint setup, and for a test I added a Task List, added a few columns, and tested it out. I wanted to modify the task list task page, not the task list page. I can edit the task list page, but I cannot edit the task list task page. I am missing the Edit Page button from site actions on that page. How can I edit the page of the actual task? Thanks.

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• Basic xhtml/css models ?

  - by Skeptic

  Hi, I need to produce a very simple website (no dynamic-content, 2-columns, header&footer) and I have a basic knowledge of xhtml/css. So I could probably come with something from scratch, but it would probably won't work in "all" browsers. I've done some googling, but it's difficult for me to evaluate the quality of the "free templates" advertized all over the place. So is there any web developer here that has good references or even such models/templates ?

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• Can I do this in one Mysql query?

  - by bsandrabr

  Hi I have a table with two columns: column A column B 1 2 1 2 2 1 I want to return total of ones = 3 total of twos = 3 The best I can come up with is two queries like so: SELECT sum( CASE WHEN columnA =1 THEN 1 ELSE 0 END ) + sum(CASE WHEN columnB =1 THEN 1 ELSE 0 END ) SELECT sum( CASE WHEN columnA =2 THEN 1 ELSE 0 END ) + sum(CASE WHEN columnB =2 THEN 1 ELSE 0 END ) Can this be done in one query? Thanks

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• Best way to test for a variable's existence in PHP; isset() is clearly broken

  - by chazomaticus

  From the isset() docs: isset() will return FALSE if testing a variable that has been set to NULL. Basically, isset() doesn't check for whether the variable is set at all, but whether it's set to anything but NULL. Given that, what's the best way to actually check for the existence of a variable? I tried something like: if(isset($v) || @is_null($v)) (the @ is necessary to avoid the warning when $v is not set) but is_null() has a similar problem to isset(): it returns TRUE on unset variables! It also appears that: @($v === NULL) works exactly like @is_null($v), so that's out, too. How are we supposed to reliably check for the existence of a variable in PHP? Edit: there is clearly a difference in PHP between variables that are not set, and variables that are set to NULL: <?php $a = array('b' => NULL); var_dump($a); PHP shows that $a['b'] exists, and has a NULL value. If you add: var_dump(isset($a['b'])); var_dump(isset($a['c'])); you can see the ambiguity I'm talking about with the isset() function. Here's the output of all three of these var_dump()s: array(1) { ["b"]=> NULL } bool(false) bool(false) Further edit: two things. One, a use case. An array being turned into the data of an SQL UPDATE statement, where the array's keys are the table's columns, and the array's values are the values to be applied to each column. Any of the table's columns can hold a NULL value, signified by passing a NULL value in the array. You need a way to differentiate between an array key not existing, and an array's value being set to NULL; that's the difference between not updating the column's value and updating the column's value to NULL. Second, Zoredache's answer, array_key_exists() works correctly, for my above use case and for any global variables: <?php $a = NULL; var_dump(array_key_exists('a', $GLOBALS)); var_dump(array_key_exists('b', $GLOBALS)); outputs: bool(true) bool(false) Since that properly handles just about everywhere I can see there being any ambiguity between variables that don't exist and variables that are set to NULL, I'm calling array_key_exists() the official easiest way in PHP to truly check for the existence of a variable. (Only other case I can think of is for class properties, for which there's property_exists(), which, according to its docs, works similarly to array_key_exists() in that it properly distinguishes between not being set and being set to NULL.)

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• How to make a report with count of type of cases in each month in Acess 2010

  - by amir shadaab

  I have a database is access with each record having a date and yes/no type columns for each record which shows which category the record comes under. I want to create a report which shows the types of cases in each month by taking a date range as a parameter through prompts. I have done the prompt part but I'm not sure how the query should be to show values for each month in that date range. Can someone please help me with this?

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• UNIQUE Constraints in SQL (SQL Server)

  - by rockbala

  Why are UNIQUE Constraints needed in database ? Can you provide any examples ? Primary Key is UNIQUE by default... Understandable as they are referred in other tables as Foreign keys... relation is needed to connect them for rdbms platform... but why would one refer to other columns as UNIQUE, what is benefit of doing so ?)

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• Need this VB code changed into Python.

  - by David

  I wrote this code in VB to label columns in a table but now im writting a python script to automate the process and i can't make it work. Any thoughts?? Static v1 as variant Static v2 as variant Dim Output as double Dim Start as double Start = 1 If v2 = [XMIN] Then Output = v1 Else Output = v1 + 1 End If v1 = Output v2 = [XMIN]

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• Fluent NHibernate: Mapping a column with a different name

  - by Fred

  Let's say I have a table: Project Id Title ProjectManagerId ContactId ProjectManagerId and ContactId are both id's from a table named Person: Person PersonId Firstname Lastname How can I map these two columns to create a person object? (either using automapping or fluent's normal mapping). Thanks

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• How to change SRID of geometry column?

  - by Z77

  I have table where the one of columns is geometry column the_geom for polygons with SRID. I added new column in the same table with exactly the same geometry data as in the_geom. This another column has name the_geom4258 because I want here to set up another SRID=4258. So what is the procedure to set up another SRID geometry to be changed (in another coord.system)? Is just enough to apply following query: UPDATE table SET the_geom4258=ST_SetSRID(the_geom4258,4258);

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• CSS ul userlist formatting

  - by Titan

  Hi, I am trying to break away from using tables in my formatting, and am trying out using userlist html tags <ul> Say I have a panel with 10 controls, and I want a 3 columns display, therefore 3 controls in each row, and a total of 4 rows for 10 controls. Should I use 4 different <ul> or should I just stack them inside one <ul> Please tell me the advantages and disadvantages Thanks

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• Total of float column in linq query

  - by Krummelz

  I have a linq query, that gets data from a table in a DataContext object. One of the columns in this table has a Datatype of float. I would like to get the total of that specific column. How could I go about doing this?

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• how to create Custom Server control for GridView using C#.net

  - by Dhanapal

  Hi, I want to created a Custom Server Control (Inherited from GridView). On the page, the GridView is DataBound to a DataSet, so I do not know at design time what columns will be present in my GridView. Now, what I want to do is, to add a textbox in every Cell for the GridView Header row, and those textboxes will control column filtering.

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• How to Get a Specific Column Value from a DataTable?

  - by peace

  I have a datatable. I need to fetch a certain column value based on the user input. For example, lets say the datatable has two columns CountryID and CountryName. I need to find CountryID in the datatable based on the user input country name. I could just open a connection with DB and run the query select countryID from Country where countryName = @userinput. Is there anyway i could do this on the datatable.

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• Linq - get compare with transliterated value of fields

  - by Maxim

  Hi! I have a table (sql server). One of its columns ('Name') Contains Cyrillic values. From parameters i recieve value, that contains in this field but the are transliterated. i mean something like: var q = from r in m_DataContext.Table where CTransliteration.Transliterate(r.Name).Contains(trans_text) select r; How can i transliterate value on-fly?

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• Add LINQ Auto-Generated Value Marker [Column(IsDbGenerated=true)] in Buddy Class

  - by Alex

  Hello, is it possible to decorate a field of a LINQ generated class with [Column(IsDbGenerated=true)] using a buddy class (which is linked to the LINQ class via [MetadataType(typeof(BuddyMetadata))]) ? My goal is to be able to clear and repopulate the LINQ ORM designer without having to set the "Auto Generate Value" property manually every time to re-establish the fact that certain columns are autogenerated. Thanks!

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• Store Image in DataTable

  - by Aizaz

  I want to store image into my datatable and while adding colum I want to set its default value, sending you code doing with checkboxes.. public void addCheckBoxesRuntime(){ for (int i = 0; i < InformationOne.Length; i++) { dt = new DataColumn(InformationOne[i][1] + " (" + InformationOne[i][0] + " )"); dt.DataType = typeof(Boolean); viewDataTable.Columns.Add(dt); dt.DefaultValue = false; } }

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