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SQL SELECT speed int vs varchar
...your (say) 8-byte ints are longer than ascii varchars holding some textual IDs of avg length 3-4 chars. So, this answer - being imprecise and lacking any specific context or experimental results - doesn't really answer the question. Everyone knows that varchars are allowed to take much more space th...
SQL left join vs multiple tables on FROM line?
...ELECT * -- for simplicity
FROM Company, Department, Employee
WHERE Company.ID *= Department.CompanyID
AND Department.ID = Employee.DepartmentID
Note that the last one there is an inner join, in order to fulfill the criteria that you only want departments with people.
Ok, so what happens now. We...
Using the “animated circle” in an ImageView while loading stuff
...is block of xml in your activity layout file:
<RelativeLayout
android:id="@+id/loadingPanel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ProgressBar
android:layout_width="wrap_content"
android:lay...
How to scroll up or down the page to an anchor using jQuery?
I'm looking for a way to include a slide effect for when you click a link to a local anchor either up or down the page.
14 ...
How to change the session timeout in PHP?
...sion.gc_maxlifetime', 3600);
// each client should remember their session id for EXACTLY 1 hour
session_set_cookie_params(3600);
session_start(); // ready to go!
This works by configuring the server to keep session data around for at least one hour of inactivity and instructing your clients that ...
数据结构与本地数据库 05：搜索、倒序与重复导入 · App Inventor 2 中文网
...按题目或分类找记录，倒序改变显示顺序；选中后仍用 ID 修改原记录。导入以题目+答案判断重复，分类变化本课不产生新卡片。
先预测，再运行
筛选后第一项一定是原始列表第一项吗？
先记下自己的答案...
How do I handle ImeOptions' done button click?
...p with a combination of Roberts and chirags answers:
((EditText)findViewById(R.id.search_field)).setOnEditorActionListener(
new EditText.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
// Identifier of the action...
jQuery .on('change', function() {} not triggering for dynamically created inputs
...
You should provide a selector to the on function:
$(document).on('change', 'input', function() {
// Does some stuff and logs the event to the console
});
In that case, it will work as you expected. Also, it is better to specify some el...
How can I generate an INSERT script for an existing SQL Server table that includes all stored rows?
...
It's a hidden option IMHO. Should be more apparent... :)
– Leniel Maccaferri
Jun 8 '12 at 8:21
...
Generating a unique machine id
I need to write a function that generates an id that is unique for a given machine running a Windows OS.
15 Answers
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