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Why is “a” != “a” in C?
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'a' == 'A' // not true ... MySQL begs to differ.
– Steven
Jan 30 '11 at 21:09
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Alternate output format for psql
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If you looking for equivalent to \G from Mysql, try append \x\g\x to the end of query or define shortcut in ~/.psqlrc adding \set G '\\set QUIET 1\\x\\g\\x\\set QUIET 0', then use on the end :G. (note lack of semicolons)
– Sławomir Lenart
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How can the Euclidean distance be calculated with NumPy?
...t(x^2 + y^2 + z^2)) so we're making a lot of sqrt calls. Math 101:
dist = root ( x^2 + y^2 + z^2 )
:.
dist^2 = x^2 + y^2 + z^2
and
sq(N) < sq(M) iff M > N
and
sq(N) > sq(M) iff N > M
and
sq(N) = sq(M) iff N == M
In short: until we actually require the distance in a unit of X rather th...
Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
.../daemon.json
# 在文件中添加一下内容：
{
"data-root": "/data/app/dockerWork",
"insecure-registries": ["ss.suwell.com"],
"registry-mirrors": ["https://geuj9lut.mirror.aliyuncs.com"]
}
备注：可能会存在直接复制粘贴后的json文件不可用的情况...
apache redirect from non www to www
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<VirtualHost *:80>
DocumentRoot "what/ever/root/to/source"
ServerName www.example.com
<Directory "what/ever/root/to/source">
Options FollowSymLinks MultiViews Includes ExecCGI
AllowOverride All
Order allo...
Code coverage for Jest
...After executing jest, you can get coverage report on console and under the root folder set by jest, you will find the coverage report in json and html format.
4) FYI, if you install from npm, you might not get the latest version; so try the github first and make sure the coverage is what you need.
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scp with port number specified
...t 80
User username
Then you can use:
scp username@www.myserver.com:/root/file.txt .
or
scp short:/root/file.txt .
You can use anything on the "Host" line with ssh, scp, rsync, git & more
There are MANY configuration option that you can use in config files, see:
man ssh_config
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Retaining file permissions with Git
...ssions for all the files in the repository and store them in a file in the root of the repository called .permissions and then add the .permissions file to the commit.
The second hook is called when you "checkout" and will go through the list of files in the .permissions file and restore the owners...
php $_POST array empty upon form submission
...e a custom CMS i've built that works perfectly on my dev box (Ubuntu/PHP5+/MySQL5+).
27 Answers
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How to change column datatype in SQL database without losing data
...:
ALTER TABLE [Employee] ALTER COLUMN [Salary] NUMERIC(22,5)
if you use MySQL; you should try this script:
ALTER TABLE [Employee] MODIFY COLUMN [Salary] NUMERIC(22,5)
if you use Oracle; you should try this script:
ALTER TABLE [Employee] MODIFY [Salary] NUMERIC(22,5)
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