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Difference between partition key, composite key and clustering key in Cassandra?
...KEY:
insert into stackoverflow_simple (key, data) VALUES ('han', 'solo');
select * from stackoverflow_simple where key='han';
table content
key | data
----+------
han | solo
COMPOSITE/COMPOUND KEY can retrieve "wide rows" (i.e. you can query by just the partition key, even if you have clusteri...
ERROR: Error 1005: Can't create table (errno: 121)
...y used somewhere else
To check constraints use the following SQL query:
SELECT
constraint_name,
table_name
FROM
information_schema.table_constraints
WHERE
constraint_type = 'FOREIGN KEY'
AND table_schema = DATABASE()
ORDER BY
constraint_name;
Look for more information there,...
What key shortcuts are to comment and uncomment code?
...e Environment -> Keyboard page.
These commands are named Edit.CommentSelection and Edit.UncommentSelection.
(With my settings, these are bound to Ctrl+K, Ctrl+C and Ctrl+K, Ctrl+U. I would guess that these are the defaults, at least in the C++ defaults, but I don't know for sure. The best w...
How to get random value out of an array?
...
You could use the array_rand function to select a random key from your array like below.
$array = array("one", "two", "three", "four", "five", "six");
echo $array[array_rand($array, 1)];
or you could use the rand and count functions to select a random index.
$...
Javascript / Chrome - How to copy an object from the webkit inspector as code
...
Right-click an object in Chrome's console and select Store as Global Variable from the context menu. It will return something like temp1 as the variable name.
Chrome also has a copy() method, so copy(temp1) in the console should copy that object to your clipboard.
No...
How do I access my SSH public key?
...="xclip -sel clip" and then pbcopy < ~/.ssh/id_rsa.pub OR simply xclip -selection clipboard < ~/.ssh/id_rsa.pub
– gebbissimo
Mar 8 '19 at 12:29
...
Converting VS2012 Solution to VS2010
...y still get the incompatible error (as David reported) if you had .NET 4.5 selected as the default .NET version in your VS2012 project and your VS2010 enviroment doesn't support that.
To quickly fix that, open the VS2012 .csproj file in a text editor and change the TargetFrameworkVersion down to 4....
How to use ArrayAdapter
... mAdapter.add("Item " + i);
}
// And if you want selection feedback:
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//...
Connect Java to a MySQL database
...Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT ID FROM USERS");
...
rs.close();
stmt.close();
conn.close();
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How do I read text from the (windows) clipboard from python?
...r: from Tkinter import Tk [\nl] r = Tk() [\nl] result = r.selection_get(selection = "CLIPBOARD") [\nl] r.destroy()
– mgkrebbs
Jan 8 '14 at 0:42
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