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Modify table: How to change 'Allow Nulls' attribute from not null to allow null
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For MySQL, MariaDB
ALTER TABLE [table name] MODIFY COLUMN [column name] [data type] NULL
Use MODIFY COLUMN instead of ALTER COLUMN.
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What does java:comp/env/ do?
...ione.zcu.cz/java/docs/jndi-1.2/tutorial/beyond/misc/policy.html
At the root context of the namespace
is a binding with the name "comp",
which is bound to a subtree reserved
for component-related bindings. The
name "comp" is short for component.
There are no other bindings at the
root...
What is the difference between “expose” and “publish” in Docker?
...expose bash
Inside the container, I launch a few instances of mini-httpd:
root@fb8f7dd1322d:/# mini_httpd -p 80
root@fb8f7dd1322d:/# mini_httpd -p 8080
root@fb8f7dd1322d:/# mini_httpd -p 8090
I am then able to use curl from the host or other containers to fetch the home page of mini-httpd.
Furthe...
Deep Learning（深度学习）学习笔记整理系列之（一） - 大数据 & AI - 清泛...
...，Deep Learning。借助于 Deep Learning 算法，人类终于找到了如何处理“抽象概念”这个亘古难题的方法。
2012年6月，《纽约时报》披露了Google Brain项目，吸引了公众的广泛关注。这个项目是由著名的斯坦福大学的机器学习...
TypeError: $.ajax(…) is not a function?
I'm trying to create a simple AJAX request which returns some data from a MySQL database. Here's my function below:
13 Answ...
Get the current script file name
...heir own impotence, But you can safe your url using different filers, like mysql_real_escape_string, stripslashes etc..
– Khandad Niazi
Jan 29 '14 at 15:43
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Finding duplicate rows in SQL Server
... I found this answer that worked just great: Get list of duplicate rows in MySql
SELECT n1.*
FROM myTable n1
INNER JOIN myTable n2
ON n2.repeatedCol = n1.repeatedCol
WHERE n1.id <> n2.id
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How do you turn off version control in android studio?
... Android Studio 1.2.x
FILE -> SETTINGS -> VERSION CONTROL
Here the root is shown, Press (-) button to delete.
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How to format all Java files in an Eclipse project at one time?
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Right click on the project root and select Source -> Format. This should work for at least version 3.8.1. and above.
If the above does not work, you're probably using an older Eclipse-version. In such case you can select your Source Folders by clic...
Which is the preferred way to concatenate a string in Python?
...rns. And this is just yet another reason why premature optimization is the root of all evil. Don't use a technique that's supposed "faster" unless you first measure it.
Therefore the "best" version to do string concatenation is to use + or +=. And if that turns out to be slow for you, which is pret...