FAQ Database Discussion Community


why do I need to update nfds in select call when I remove fds from master set?

c,sockets,select
Given a select call like this: select(fdMax+1, &readFds, NULL, NULL, &timeoutVal) where readFds are updated whenever new fd is added existing fd is removed Whenever new fd is added, I update the fdMax. However, whenever existing fd is removed, I'm wondering if I really need to update the fdMax also...

PHP: How to push Select results to multi-dimensional array (partially working)

php,arrays,loops,select,multidimensional-array
I am new to PHP and hope someone can help me with this. I have a Select query that returns (among others) the values from two columns in a db table, "ID" and "en". When getting the results from the Select I would like to store both these values for...

Which performs first WHERE clause or JOIN clause

sql,sql-server,select,join,where
Which clause performs first in a SELECT statement? I have a doubt in select query on this basis. consider the below example SELECT * FROM #temp A INNER JOIN #temp B ON A.id = B.id INNER JOIN #temp C ON B.id = C.id WHERE A.Name = 'Acb' AND B.Name =...

how to Select data from multiple tables with several conditions?

sql,oracle,table,select
There are tables FACULTIES (F_NUMB, F_NAME, F_TELEF) and STUDENTS (S_NUM, SURNAME, SPECIALITY, GROUP, FACULTY_NUMB). Please write SQL query to achieve faculties names in which the count of students are greater than in faculty “Computer science”. This is what i'm doing: select faculties.f_name, count(STUDENTS.S_NUM) from STUDENTS, FACULTIES where students.fac_num=FACULTIES.F_NUMB group by...

Swift Segment Control how to select more than one segment

swift,select,uisegmentedcontrol
I have a Segment Control in my app, I want to user to be able to click multiple of the segments. I googled and could not find any about this and there was no checkbox in Xcode for something like 'Allow multiple selection'. I found that in objective-c you weren't...

Calling SELECT * on a primary key versus an attribute in SQL

mysql,sql,select,primary-key
I am currently studying for a final and have a question about one of the practice problems. The problem states: Consider the following two SQL queries over the relation R(A,B) where attribute A is the primary key. Query 1: SELECT * FROM R WHERE B > 50 OR B <=...

Select where max date

sql,sql-server,select,max
I want to select the last note from notes with the following query: SELECT cn.Note, MAX(cn.Date) FROM CarsNote cn WHERE CustomerID = '80' AND cn.Type = 'INFO' GROUP BY Note When I execute this query i get four results but i want only the last note. When i do SELECT...

PHP $wpdb Select?

php,mysql,wordpress,select
I could use some assistance with an sql query. I have a small 3 column table, id, ip, and birthday. id auto increments. I'm trying to select all birthdays that are associated with a specific ip, but I'm not sure if the SQL statement I wrote is correct. The var_dump...

Formatting dates in PostgreSQL

sql,postgresql,select,date-formatting
I have a field which its format is date with time as: YYYY-MM-DD HH-MM-SS for example: 2000-08-12 00:00:00 I want to get just the date part and change its format to DD/MMM/YYYY for example the expected result of the previous example will be: 12/Aug/2000 The field definition is: Ddate timestamp...

Customize a select with font-awesome

css,select,font-awesome
This is what I have actually: HTML <label class="select"> <select name="email" id="email"> <option>aaaa</option> <option>aaaa</option> <option>aaaa</option> <option>aaaa</option> <option>aaaa</option> <option>aaaa</option> </select> </label> CSS .cforms select { -webkit-appearance: none; -moz-appearance: none; appearance: none; } .select { position:relative; display: -moz-inline-stack; display: inline-block; vertical-align: middle; zoom: 1;...

Sqlzoo SELECT within SELECT Tutorial #5

sql,select
My Question is: Germany (population 80 million) has the largest population of the countries in Europe. Austria (population 8.5 million) has 11% of the population of Germany. Show the name and the population of each country in Europe. Show the population as a percentage of the population of Germany. My...

Cakephp3 transaction find query

mysql,select,transactions,cakephp-3.0
When making a transaction in cakephp3 and adding a get() query inside all works fine. But why is a find() query not performed inside the transaction? I have the following controller in cakephp3: <?php namespace App\Controller; use Cake\Core\Configure; use Cake\Network\Exception\NotFoundException; use Cake\View\Exception\MissingTemplateException; use Cake\Network\Session; use Cake\Event\Event; use Cake\Network\Http\Client; use Cake\ORM\TableRegistry;...

referencing mySQL query components

mysql,sql,select,alias
Is there a way to make reference to parts of a MySQL query within the same query? For example: SELECT 50000 AS starting_principle, .065*50000 AS interest, principle + interest AS principle_plus_interest The third column, principle_plus_interest in the query set gives me an error. Is there a way to code this...

iOS: change background color using multiple buttons

ios,select,button,background
I am trying to change background color randomly as an effect overtime any of the buttons on the screen are tapped. I would like to control this effect with an On/Off UIButton. Tapping ChangeColorButton just logs “Off” never “On”. Not sure what to do? thanks everyone!! edited code so far!!...

In a MySQL select statement, can I split a text column and then sum the parts as floats?

mysql,select,casting,split
I have a MySQL column that is defined as text. The column, if not null, always contains a list floats separated by a newline character. I have been tasked with making the total amount of those floats searchable with min and max constraints. In the where clause, I would like...

Type error calling select Standard ML

sockets,select,sml
I'm trying to call Socket.select to deal with some sockets. It seems like the following minimal snippet from my code should work... fun descs ss = map Socket.sockDesc ss fun selecting server clients = let val { ss, ws, cs } = Socket.select { rds = descs [server], wds =...

Using Sum in If in Mysql

mysql,sql,select,sum
I want to select the sum of values of my_field. The unit of my_field is in seconds. I don't want to exceed 24 hours, so when it exceeds 24 hours, I want it to select 24*60*60 = 86400. SELECT IF(SUM(my_field) > 86400, 86400, SUM(my_field)) ... This solution doesn't seem to...

MySql : issue with GROUP BY and COUNT clauses

mysql,sql,select,count
I have this table I would like to display products(with their type) that have at least two different types. Here : I have tried this : SELECT PRODUCT, TYPE FROM MYTABLE group by PRODUCT, TYPE HAVING count(PRODUCT) > 1; but it doesn't give me the result I want....

PHP: While loop not working after adjusting SELECT for SQL injection prevention

php,mysql,select,sql-injection,associative-array
I am trying to set up PHP queries for MySQL in a way to prevent SQL injection (standard website). I had a couple of INSERT queries where changing this worked well but on the following SELECT I keep getting an error since the update and it looks like the while...

How to perform boolean addition on an SQL select

sql,sql-server,select,sum,boolean
I have the following data in a database table column named timeSchedule 00100110 00010100 00110000 00110011 Boolean addition would result in 00110111 Is there a way to do this in sql? Something like select sumboolean(timeSchedule) from myTable Someone asked for DDL+DML.. here is an example: CREATE TABLE [dbo].[myTable]( [musPracticeID] [int]...

JQuery select input value from input text generate by php

php,jquery,select
i have this structure that i generate for each element finded by a search <?php foreach ($this->pneumatici as $pneumatico) :?> <div class="col-md-3 element-form"> <div class="input-group input-float"> <input type="hidden" name="codice" value="<?= $pneumatico->codice ?>" id="codice"> <input type="text" class="form-control" id="quantita" value="0" size="1" maxlength="2" <?php if ($pneumatico->quantita == 0){ echo "disabled" } ?> >...

Adding multiple data in select option rails 4

ruby-on-rails,ruby,ruby-on-rails-4,select
I am using bellow code and function options_from_collection_for_select for generating options for user. <%= select_tag 'receiver', options_from_collection_for_select(@user, 'id', 'email') %> Above code generate bellow html: <select id="receiver" name="receiver" style="display: none;"> <option value="1">[email protected]</option> <option value="2">[email protected]</option> <option value="3">[email protected]</option> </select> But i want email with username, e.g...

f.select losing value when editing Rails 4

html,ruby-on-rails,forms,ruby-on-rails-4,select
I have an f.select in the new article page, and it works fine. However, when I edit the article, the value changes back to whatever is first in the options. Is there a way to keep the select value so users don't have to worry about redoing that when editing...

Codeigniter Select JSON, Insert JSON

json,codeigniter,select,insert,routing
I have very simple users database: user_id, user_name, user_email My model this: class Users extends CI_Model { private $table; private $table_fields; private $table_fields_join; function __construct() { parent::__construct(); $this->table = 'users'; $this->table_fields = array( $this->table.'.user_id', $this->table.'.user_name', $this->table.'.user_email' ); $this->table_fields_join = array(); } function select(){ $this->db->select(implode(', ', array_merge($this->table_fields, $this->table_fields_join)));...

SQL Case Value Switching

sql,select,case
I am passing a series of double values in from another table ranging from -1 to 1. If the value is positive, I want to make it the difference between it and 1 (ie. 0.2 would then become .8). If value is negative, I want it to be the delta...

Understanding cartesian product in SQL

mysql,sql,select,join,cartesian-product
I am not able to understand how Cartesian product works. Consider the simple schema: mysql> select * from account; +----------------+-------------+---------+ | account_number | branch_name | balance | +----------------+-------------+---------+ | A101 | Downtown | 500 | | A102 | Perryridge | 400 | | A201 | Brighton | 900 | |...

SQL Server query syntax with single quote

sql,sql-server,sql-server-2008,select,escaping
I have in my database KIA car model like CEE'D. How to write right syntax to get all car where model = CEE'D Now I am using semipart of model SELECT make, model FROM Cars WHERE model LIKE '%CEE%' But now I need to get by full model name. How...

python - how to check whether some given date exists in netcdf file

python,date,select,netcdf
I read my timesteps from a netcdf file: timesteps = ncfile.variables['time'] Now I would like to know whether some given date (say, June 23th) exists in that list. If it does, I want to omit it. The netcdf file contains arbitrary dates. I have no clue how to do this...

Append selected list elements into textarea, add own text

javascript,angularjs,select,textarea
On the basis of this post : Angularjs select elements from list and display in textarea I would like to add functionality : Fill textarea on the basis of chosen elements from the list. Add additional text inserted by user -> when user decides that he/she wants to add element...

MySQL select from 2 tables without having “shared” key

mysql,select
Searched the site and found some similar questions, but none of solutions worked in my case. I have 2 tables - clients and memberships. The structure is following: clients client_id other_fields... memberships membership_id client_id other_fields... The field submitted to form is "membership_id". Let's say submitted value is 5. I want...

OrientDB - Result from 2 different tables

sql,database,select,orient-db
I have a database that has 2 V's classes ('User' that has 2 strings named Name and Surname ,'Cinema') and 2 E's classes ('isGoing' that has an Integer property named Day, 'Friend'). This select returns all the 'Cinema' that the 'Friend' of the initial Vertex are going on a specific...

How to select a range of my table

mysql,sql,select,range
I have a table like this: (Pay attention to the sequence numbers for every word) // tablename +---------+----------+ | word | number | ---------------------- | jack | 1 | | jack | 2 | | jack | 3 | | ali | 1 | | ali | 2 | |...

no such column error - sqlite

android,sql,sqlite,select,android-sqlite
I get a strange error: E/SQLiteLog﹕ (1) no such column: Test 06-22 01:51:20.006 15089-15089/com.almas.mehr.sms E/AndroidRuntime﹕ FATAL EXCEPTION: main android.database.sqlite.SQLiteException: no such column: Test (code 1): , while compiling: SELECT * FROM groups WHERE title = Test at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1090) at...

Select Where Result Is In String [on hold]

mysql,sql,select
I would like to perform a SQL Select Statement where any text in the query is a result. For example, if the query is 'Driving Directions to Dundee in Scotland' I want this result to be returned id: 5 name: Dundee description: Dundee is a City in Scotland Location: 56.4640°...

Javascript - return dynamic row data with checkbox input

javascript,forms,select,checkbox,tabular
I seem to only be able to find the answer to this problem in JQuery and I would really like a pure JS solution. I have a dynamically generated table that I build from a parsed JSON file. I added a checkbox for each row. My question is, do I...

SQL Oracle | How would I select a substring where it begins with a certain letter and ends with a certain symbol?

sql,oracle,select,substring
If I had this: NAME EYES==ID==HAIR Jon Brown==F9182==Red May Blue==F10100==Brown Bill Hazel/Green==F123==Brown ...and I wanted to create a new ID column with the ID alone, and I know that everyone's ID starts with an 'F' and will end at the '=' how would I select a substring from the compact...

How to find top usage of IP pairs in PostgreSQL?

sql,postgresql,select,sum
I have a table with source_ip and destination_ip and usage. now i want to find top usage for ip pairs. My table is like this: source_ip | destination_ip | usage 192.168.1.1 | 192.168.1.2 | 20 192.168.1.2 | 192.168.1.1 | 30 192.168.1.3 | 192.168.1.2 | 20 192.168.1.2 | 192.168.1.3 | 20...

Autoupdating Field Based on two