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• MySQL: how to index an "OR" clause

  - by JoséMi

  I'm executing the following query SELECT COUNT(*) FROM table WHERE field1='value' AND (field2 = 1000 OR field3 = 2000) There is one index over field1 and another composited over field2&field3. I see MySQL always selects the field1 index and then makes a join using the other two fields which is quite bad because it needs to join 146.000 rows. Suggestions on how to improve this? Thanks

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• MSSQL. Compare columns in two tables.

  - by maxt3r

  Hi, i've recently done a migration from a really old version of some application to the current version and i faced some problems while migrating databases. I need a query that could help me to compare columns in two tables. I mean not the data in rows, i need to compare the columns itself to figure out, what changes in table structure i've missed.

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• self join table

  - by San82moon

  HI, i have a table, new_id----old_id----created_on 1234------5678------20100912 5678------3456------20100808 etc. i wrote this query, $q = "select event1.new_id, event1.old_id, event1.created_on,event2.new_id, event2.old_id, event2.created_on FROM replaced_isbns event1 JOIN replaced_isbns event2 ON event2.new_id = event1.old_id WHERE event1.new_id='$id'"; but i get result as 5678 - 1234, ie only one row, i want all rows... plz help me. Thanks, SLC

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• Existing function to slice pandas object by axis number

  - by Zero

  Pandas has the following indexers: Object Type Indexers Series s.loc[indexer] DataFrame df.loc[row_indexer,column_indexer] Panel p.loc[item_indexer,major_indexer,minor_indexer] I would like to be able to index dynamically by axis, for example: df = pd.DataFrame(data=0, index=['row1', 'row2', 'row3'], columns=['col1', 'col2', col3']) df.index(['row1', 'row3'], axis=0) # index by rows df.index(['col1', 'col2'], axis=1) # index by columns Is there a built-in function that does this?

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• MySql Not Like Regexp?

  - by KnockKnockWhosThere

  I'm trying to find rows where the first character is not a digit. I have this: SELECT DISTINCT(action) FROM actions WHERE qkey = 140 AND action NOT REGEXP '^[:digit:]$'; But, I'm not sure how to make sure it checks just the first character...

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• how to increase the size of the jquery grid row..

  - by kumar

  how to increase row size using jquery.. I have column like this. { name: 'Comments', index: 'Comments', editable: true, editype: 'textarea', editoptions: { rows: "2", cols: "10"} } Thanks

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• Activerecord default accessors & unusual requirements

  - by JP

  I have an ActiveRecord::Base class which needs to have a field that is automatically generated when a new instance is made. How should I go about doing this? By defining an initialize function? class Thing < ActiveRecord::Base # 'special' (integer) needs to be set to lowest unused number (above 0) # considering that random rows will be removed via other processes end This is as far as I've got! Any ideas?

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• how to build a simple gridview only for insertion (no bind)?

  - by user359706

  Hello, how do I implement a rapid gridview with two columns, with ability to add rows by clicking the add button, and remove in the same way. I look for plugins, but often contain many unnecessary option in my case, I'm looking for something fairly simple. solution jquery, ajax.. I'm using ASP.net (C #) someone has an idea ? thank you

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• Local Databse Storage default data.

  - by kiranmply

  Hi I have developed application using HTML 5 Localstorage. How can I create a TABLE and populate 10000+ rows before initializing my HTML 5 enabled application. Please suggest a pattern.

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• How to get an array size

  - by John Doe

  I'd like to know how to get an array rows & columns size. For instance it would be something like this: int matrix[][] = { { 2, 3 , 4}, { 1, 5, 3 } } The size of this one would be 2 x 3. How can I calculate this without including other libraries but stdio or stdlib?

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• MySQL Search (Sort by Relevance)

  - by atif089

  Hi guys, Can any one help me how to sort rows by relevance for the following criterion ? tbluser First Name Last Name tbleduc School College University On the search form the user has following fields Name School College University Where School College and University are Optional.. And Name is split into 2 words (other words in middle are omitted), first word is taken as first anme and last word as last name.. Now I would like to implement search based on relevance. Thanks for the help :)

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• mysql - How select a akin records?

  - by zeroonea

  I have a table with name varchar address varchar country varchar city varchar ..... to store address of location example: name|address|country HaLong hotel|156 blahblah street|Vietnam Hotel Ha Long|156 blah blah|Vietnam Two rows above is duplicate data. I have a form, when user submit new location. The code need to find akin records to give a message (ex: This location already in db, use it or create new?) How to make a query to get akin record like this?

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• Can we use a sql data field as column name instead?

  - by Starx

  First a query SELECT * FROM mytable WHERE id='1' Gives me a certain number of rows For example id | context | cat | value 1 Context 1 1 value 1 1 Context 2 1 value 2 1 Context 1 2 value 3 1 Context 2 2 value 4 Now my problem instead of receiving the result in such way I want it is this way instead id | cat | Context 1 | Context 2 1 1 value 1 value 2 1 2 value 3 value 4

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• Deserialize JSON, sometimes value is an array, sometimes "" (blank string).

  - by karl.r

  I am trying to deserialize a field: "presenters":[{...},{...}] but some of the rows come back with only: "presenters":"" When the serializer gets to the row with that empty string I get: Error converting value "" to type 'System.Collections.Generic.List`1[DataPrototype.Model.Presenter]'. Am I right in thinking that I need a JsonConverter that will change the empty string into an empty List?

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• MySQL: SUM in WHERE clause

  - by checcco

  Hi guys, I've got this table CREATE TABLE `subevents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(150) DEFAULT NULL, `content` text, `class` tinyint(4) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=MyISAM Each row can have a different value in the 'class' field. I'd like to select any number of rows, ordered randomly, as long as the sum of the values in the 'class' field is equal to 100. How could I accomplish it directly in the MySQL query without doing it later in PHP? Thanks everybody!

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• Can somebody recommend a CSV to Html Table Generator?

  - by DaveDev

  I need to parse a pretty simple csv file which represents 7 columns and 3 rows. Is there anything built into .Net to do this or should I do it manually?

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• Get insert statement query

  - by Karthick

  Hi, Is there a way to get the insert statements for a table via some query in MySql? for ex: if the table name is Cards,which has 5 rows, i need to get the insert statements for that particular table. Thanks.

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• SQL Server: compare columns in two tables.

  - by maxt3r

  Hi, I've recently done a migration from a really old version of some application to the current version and i faced some problems while migrating databases. I need a query that could help me to compare columns in two tables. I mean not the data in rows, I need to compare the columns itself to figure out, what changes in table structure I've missed.

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• NULL value in :conditions =>

  - by Horace Ho

  Contract.all(:conditions => ['voided == ?', 0]).size => 364 Contract.all(:conditions => ['voided != ?', 0]).size => 8 Contract.all.size => 441 the 3 numbers does not added up (364 + 8 != 441). What's the proper way write the :conditions to count the rows which the voided column value is NULL or equal to zero?

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• Selecting from a Large Table SQL 2005

  - by Eugene

  I have a SQL table it has more than 1000000 rows, and I need to select with the query as you can see below: SELECT DISTINCT TOP (200) COUNT(1) AS COUNT, KEYWORD FROM QUERIES WITH(NOLOCK) WHERE KEYWORD LIKE '%Something%' GROUP BY KEYWORD ORDER BY 'COUNT' DESC Could you please tell me how can I optimize it to speed up the execution process? Thank you for useful answers.

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• How effecient is a details table?

  - by Jeffrey Lott

  At my job, we have pseudo-standard of creating one table to hold the "standard" information for an entity, and a second table, named like 'TableNameDetails', which holds optional data elements. On average, for every row in the main table will have about 8-10 detail rows in it. My question is: What kind of performance impacts does this have over adding these details as additional nullable columns on the main table?

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• How should i store availability calendar information in mysql? for [id] [date] [available/unavailab

  - by Haroldo

  I'm building a simple calendar for holiday cottages to show when they are booked or available. What would be the fastest mysql table design for this, bearing in mind when users mark dates as available/booked they will do so via a start date and an end date. i can see 2 obvious options Store 'booked' data for every day [more rows] or, store 'booked' data with 2 columns a start_date and end_date [more processing?] Which is best or is there another method i'm missing?

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• Is this sql where statement correct?

  - by Priyaa Muthuraman

  I have 10 rows for today's date but my select statement based on date dosen't seem to work.... SELECT Id,WirelessId,RegNo,DriverName1,MobileNo1,DriverName2,MobileNo1 from DailySchedule where IsDeleted=0 and CreatedDate='2010-05-28' Any suggestion...

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• Shell script that iterates through a sql "delete" statement

  - by ming yeow

  I need a shell script that deletes 1000 rows from a massive database until it is done. It is very simple, but i am very weak in shell scripting, and the many tutorials online offer extremely similar, but different nuances in syntax

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• multiple updation using single mysql query

  - by Ajith

  I need to update multiple rows with different values.Is it possible to do in mysql? ie,some thing like this UPDATE landing_page SET (rotation_slot_begin='0',rotation_slot_end='0.333333333333' where landing_pageid=265),(rotation_slot_begin='0.333333333333',rotation_slot_end='0.666666666667' where landing_pageid=267),(rotation_slot_begin='0.666666666667',rotation_slot_end='1' where landing_pageid=268) but this query is not working.I think something like this.Anybody can help me please

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