【SQL講座①】小学生でもわかるSQL 「SELECT」「FROM」「WHERE」

SQLの基本を小学生でもわかるように噛み砕いて解説しました！

SQLで実際にデータベースに対して何らかの命令を行う文を「SQL文」と呼びます。

このSQL文を利用する際に、基本的に利用する事が多いのは「SELECT」「FROM」「WHERE」の3つです。

たくさんの演算子・命令文が出てきて、よく分からないかもしれません。

確かに初心者にとっては、少し難しく感じられるものです。

とりあえず、「SELECT」「FROM」「WHERE」という3つの命令文だけは覚えておきましょう。

初めての命令文を書く際に、スムーズに進めることができます。

というのも、SELECTやFROM、WHEREはSQLにおける基本的な構文になっているからです。

SELECTは「選択」、FROM「どのテーブルから」、WHERE「どんな条件で」という意味になっています。

#sql 

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SQL SELECT INTO Example | SELECT INTO In SQL

SQL SELECT INTO is used to create a table from an existing table by copying the contents of the current table to the new table. The critical point to note here is that the column and data type of column must be the same. SELECT INTO copies data from one table into a new table. SELECT INTO creates a new table located in the default filegroup.

See the following syntax.

Select column(s) 
INTO new_table 
from old_table_name where(condition).

#PARAMETERS

1. Column(s): Name of the columns which we want to copy.
2. INTO: This is a keyword that is used to perform the copy operation.
3. New_table: Name of the new table which will be created.
4. Old_table_name: Name of the old table from where we are copying.
5. Where(condition): This is used for imposing conditions into the select statement.

#sql #sql select into #select into

Collection of 14 Vue Select Component for Vue.js App

Vue select component can handle multiple selections. It’s enabled with the multiple property. Like with the single selection, you can pull out the new value by accessing event. target. value in the onChange callback.

1. Vue GridMultiselect

Simple multi-select component with items displayed in a table like UI.

Demo

Download

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2. vue-select

Everything you wish the HTML <select> element could do, wrapped up into a lightweight, extensible Vue component.

Vue Select is a feature rich select/dropdown/typeahead component.

Features

• Tagging
• Filtering / Searching
• Vuex Support
• AJAX Support
• SSR Support
• ~20kb Total / ~5kb CSS / ~15kb JS
• Select Single/Multiple Options
• Customizable with slots and SCSS variables
• Tested with Bootstrap 3/4, Bulma, Foundation
• +95% Test Coverage
• Zero dependencies

Demo

Download

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3. @desislavsd/vue-select

Lightweight and mighty select component like Chosen and Select 2 done the Vue way.

Features

• Uses v-model
• Single / Multiple selection
• Tagging + custom key triggers
• List Filtering / Searching
• Support for async list source
• Out of the box AJAX support using fetch
• Debounce AJAX requests
• Transparent access to input attributes
• Highly customizable
• Zero dependencies

Demo

Download

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4. v-super-select

An accessible and customizable select/drop down component that features searching, grouping, and virtual scrolling.

Demo

Download

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5. vue-dynamic-select

A VueJS plugin that provides a searchable and reactive select list component with no dependencies.

Download

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6. @alfsnd/vue-bootstrap-select

A vue version of bootstrap select

Demo

Download

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7. vue-selectize

Vanila Vue.js component that mimics Selectize behaviour (no need jquery dependency)

Demo

Download

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8. vue2-selectize

A Selectize wrapper for VueJS 2.

Demo

Download

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9. v-suggest

A Vue2 plugin for input content suggestions, support keyboard to quick pick.

Demo

Download

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10. vue-multi-select

This component gives you a multi/single select with the power of Vuejs components.

Demo

Download

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11. v-cascade

A lovely component of cascade selector with vue.js (Support both of PC and Mobile)

Demo

Download

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12. stf vue select VUE2

stf vue select - most flexible and customized select

For detailed explanation on how things work, checkout the DEMO

Demo

Download

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13. Advanced Vue.js Chained Select

Using Vue.js to chain mulitiple select inputs together.

Demo

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14. Vue Select2

A native Vue.js component that provides similar functionality to Select2 without the overhead of jQuery.

Rather than bringing in jQuery just to use Select2 or Chosen, this Vue.js component provides similar functionality without the extra overhead of jQuery, while providing the same awesome data-binding features you expect from Vue. Vue-select has no JavaScript dependencies other than Vue, and is designed to mimic Select2.

Demo

Download

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Thank for read!

#vue-select #vue-select-component #vue-js #select-component

Bash Select (Make Menus) and Bash select Example

In this tutorial, we will cover the basics of the select construct in Bash.

The select construct allows you to generate menus.

Bash select Construct

The select construct generates a menu from a list of items. It has almost the same syntax as the [for](https://linuxize.com/post/bash-for-loop/) loop:

select ITEM in [LIST]
do
  [COMMANDS]
done

Copy

The [LIST] can be a series of strings separated by spaces, a range of numbers, output of a command, an array, and so on. A custom prompt for the select construct can be set using the PS3 environment variable.

When the select construct is invoked, each item from the list is printed on the screen (standard error), preceded with a number.

If the user enters a number that corresponds to the number of one of the displayed items, then the value of [ITEM] is set to that item. The value of the selected item is stored in the variable REPLY. Otherwise, if the user input is empty, the prompt and the menu list are displayed again.

Theselectloop will continue to run and prompt for user input until the[break](https://linuxize.com/post/bash-break-continue/)command is executed.To demonstrate how the select construct works, let’s take a look at the following simple example:

PS3="Enter a number: "

select character in Sheldon Leonard Penny Howard Raj
do
    echo "Selected character: $character"
    echo "Selected number: $REPLY"
done

#bash #bash select construct #bash select

Selectize.js: Selectize Is The Hybrid Of A Textbox and <select> Box

selectize.js

→ Selectize is looking for new members on the maintenance team!

Selectize is an extensible jQuery-based custom <select>; UI control. It's useful for tagging, contact lists, country selectors, and so on. It clocks in at around ~7kb (gzipped). The goal is to provide a solid & usable experience with a clean and powerful API.

• Demos
• Changelog
• Examples
• Usage Documentation
• API Documentation
• Plugin Documentation
• Browser Test Matrix

Features

• Smart Option Searching / Ranking Options are efficiently scored and sorted on-the-fly (using sifter). Want to search an item's title and description? No problem.
• Caret between items Order matters sometimes. Use the ← and → arrow keys to move between selected items.
• Select & delete multiple items at once Hold down option on Mac or ctrl on Windows to select more than one item to delete.
• Díåcritîçs supported Great for international environments.
• Item creation Allow users to create items on the fly (async saving is supported; the control locks until the callback is fired).
• Remote data loading For when you have thousands of options and want them provided by the server as the user types.
• Clean API & code Interface with it and make modifications easily. Pull requests welcome!
• Extensible Plugin API for developing custom features (uses microplugin).
• Touch Support Plays nice with iOS 5+ devices.

Dependencies

• jquery (1.7 and greater), as peer dependency
•  
  • Note: it is installed automatically in development, or in projects using NPM 1 or 2. When using NPM from version 3 on, just a warning is thrown and the user needs to manually install an explicit version in their own project (e.g. npm install --save jquery@3.5.1).
• sifter (bundled in "standalone" build)
• microplugin (bundled in "standalone" build)

Optional:

• jquery-ui (required by drag_drop plugin)

Installation and files

All pre-built files needed to use Selectize can be found in the "dist" folder.

If you're looking to get started with minimal fuss, include standalone/selectize.min.js (bundles Sifter and Microplugin dependencies – also available un-minified for debugging, just remove the .min part) and css/selectize.default.css.

Selectize is available at cdnjs.

• js/
  • standalone/
    • selectize.js — With dependencies, minus jquery
  • selectize.js — Without dependencies
• scss/
  • selectize.scss — Core styles
  • selectize.default.less — Default theme
  • selectize.bootstrap3.scss - Bootstrap 3 theme
  • selectize.bootstrap4.scss - Bootstrap 4 theme
  • plugins/ — Individual plugin styles
• less/
  • selectize.less — Core styles
  • selectize.default.less — Default theme
  • selectize.bootstrap2.less — Bootstrap 2 theme
  • selectize.bootstrap3.less — Bootstrap 3 theme
  • plugins/ — Individual plugin styles
• css/
  • selectize.css — Core styles
  • selectize.default.css — Default theme (with core styles)
  • selectize.bootstrap2.css - Bootstrap 2 theme
  • selectize.bootstrap3.css - Bootstrap 3 theme
  • selectize.bootstrap4.css - Bootstrap 4 theme

Usage

$('select').selectize(options);

The available options are documented here.

IE8 Support

To support Internet Explorer 8, es5-shim must be added your page.

<!--[if lt IE 9]><script src="http://cdnjs.cloudflare.com/ajax/libs/es5-shim/2.0.8/es5-shim.min.js"></script><![endif]-->

Custom Builds

By default, all plugins are included. To hand-pick what plugins (if any) to include, run grunt with the "--plugins" flag. After this completes, grab the files you need from the "dist" folder.

# dependencies
npm install

# build selectize
grunt --plugins=
grunt --plugins=*
grunt --plugins=remove_button,restore_on_backspace

Contributing

When issuing a pull request:

please do not include/commit changes in the dist/ folder to avoid merge conflicts. A good way to include the right files is to use git gui or git add when committing to select the files you want to add to your commit.

please include tests with your feature so that we're not tempted to break it in the future!

Add an entry to the top of the CHANGELOG, and update the documentation in docs/ as needed. (Refactors and documentation changes don't need a changelog entry.)

Squash your commits together in one or a few complete, logical commits, with a concise and descriptive message. One commit means one feature/bugfix/thing that has changed, or a diff bringing the code one step forward to a better, working state.

Once your commit is nice and clean, and you want to discard the other changes, you can use git checkout . (that will erase changes to tracked files) and git clean [-i/--interactive] (to erase untracked files). However, be careful with those commands, as their function is to erase things/changes.

Tests

Please ensure all the tests pass:

npm test # phantomjs
BROWSERS=Firefox npm test
BROWSERS=Firefox,Chrome npm test
BROWSERS=Firefox,Chrome,Safari npm test

Local environment

To run Selectize locally:

npm start

You can then run the examples in http://localhost:4000/examples/.

However, be careful not to add the dist/ files in your commit, as Grunt automatically regenerates the files in dist/ as the source is changed.

Author: Selectize
Source Code: https://github.com/selectize/selectize.js 
License: Apache-2.0 License

#javascript #select 

Selection Sort in Java

Introduction

Sorting data is a frequent problem in computer science. Given a collection of elements, the goal is to rearrange them in some order. Common examples are sorting an array alphabetically or from smallest to largest.

Sorted data is a lot easier to manipulate. Finding the largest or smallest element of an array can be done in constant time if the array is sorted. Searching for an element is a lot faster using algorithms such as Binary Search which rely on the assumption that the array is already sorted.

One of the simplest algorithms for sorting data is Selection Sort. It’s usually taught in beginner programming classes and tutorials to explain the concept of sorting, so we’ll keep this article very beginner-friendly.

#java #selection sort in java #selection sort