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What is the difference between varchar and varchar2 in Oracle?
...R2. It is NOT a SYNONYM which is an actual object type in Oracle.
SQL> select substr(banner,1,80) from v$version where rownum=1;
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL> create table test (my_char varchar(20));
Table created.
SQL> desc test
Na...
How to filter Pandas dataframe using 'in' and 'not in' like in SQL
...
Note that if you want to search every column, you'd just omit the column selection step and do
df2.isin(c1).any(axis=1)
Similarly, to retain rows where ALL columns are True, use all in the same manner as before.
df2[df2[['A', 'B']].isin(c1).all(axis=1)]
A B C
0 x w 0
Notable Ment...
(Mac) -bash: __git_ps1: command not found
... export PS1='\t H#\! \u:\w$(__git_ps1 "{%s}") -->> '
Option 2: Add a selection script
if [ -f ~/.git-completion.bash ]; then
export PS1='\w$(__git_ps1 "(%s)") > '
fi
Save and use the profile: source ~/.bash_profile or source ~/.bashrc
Now you should see the git prompt working prop...
How to get certain commit from GitHub project
...
Sivan's answer in gif
1.Click on commits in github
2.Select Browse code on the right side of each commit
3.Click on download zip , which will download source code at that point of time of commit
shar...
SqlDataAdapter vs SqlDataReader
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If your goal is to get data using a select query on db, and only access this data at different rows, go to rpevious row, etc, then you can use the SQLDatareader and load it into a datatable using dtable.Load(rdr). Then browse up and down within this datatable. ...
App Inventor 2 云数据库配置教程 - Firebase/云数据库1/自建后台 · App Inventor 2 中文网
...q.params.action === 'getvalue') {
const [rows] = await pool.execute('SELECT value FROM store WHERE tag = ?', [tag]);
return res.json(['VALUE', tag, rows.length ? rows[0].value : '']);
}
res.json(['ERROR', 'Unknown action: ' + req.params.action]);
} catch (error) { res.json(['ER...
How do I grab an INI value within a shell script?
...
This should be the selected answer. It does work with file.properties and is fault tolerant (file with empty line inside). Thanks
– Anthony
Feb 16 '17 at 8:33
...
How to make button look like a link?
... padding: 0;
border: none;
cursor: pointer;
-moz-user-select: text;
/* override all your button styles here if there are any others */
}
button.link span {
text-decoration: underline;
}
button.link:hover span,
button.link:focus span {
color: black;
}
<...
set up device for development (???????????? no permissions)
...; Storage > Upper right button: USB computer connection > Connect As Select Camera (PTP) instead of Media device (MTP)
– Thaddeus Albers
Jun 19 '15 at 23:23
3
...
Why does pycharm propose to change method to static
...that the reason for this warning is config in Pycharm.
You can uncheck the selection Method may be static in Editor->Inspection
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