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What does an Asterisk (*) do in a CSS selector?
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It is a wildcard, this means it will select all elements within that portion of the DOM.
For example, if I want apply margin to every element on my entire page you can use:
* {
margin: 10px;
}
You can also use this within sub-selections, for example the ...
How to comment out a block of code in Python [duplicate]
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vim with nerdcommenter. Select the block you want and ,c<space>
– dev_nut
Oct 10 '14 at 22:37
add a comment
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How long is the SHA256 hash?
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you can use this select statement to test it: SELECT length(to_base64(unhex(sha2('say hello to my little friend',256)))) , it is always 44 whatever the length of original string is.
– DrAhmedJava
Apr 9 '...
Connect to a heroku database with pgadmin
...ase (postgres instance in Heroku), do the following:
Login to Heroku, and select the application in which you have the database
Select the Resources tab and then click on "Heroku Postgres Ad-on" (see below). This will open up a new tab.
Select the Settings tab and then click on "View Credential...
How to use arguments from previous command?
... see:
$ echo ace
By the way, you could have put the echo on the line by selecting argument 0:
Press Alt-0 Alt-Ctrl-y
Edit:
To answer the question you added to your original:
You can press Alt-0 then repeatedly press Alt-. to step through the previous commands (arg 0). Similarly Alt-- then rep...
Cocoa Core Data efficient way to count entities
...an efficient way to make a count over an Entity-Type (like SQL can do with SELECT count(1) ...). Now I just solved this task with selecting all with NSFetchedResultsController and getting the count of the NSArray ! I am sure this is not the best way...
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MySQL, update multiple tables with one query
...'blah';
To see what this is going to update, you can convert this into a select statement, e.g.:
SELECT t2.t1_id, t2.t3_id, t1.a, t2.b, t2.c AS t2_c, t3.c AS t3_c
FROM t1
INNER JOIN t2 ON t2.t1_id = t1.id
INNER JOIN t3 ON t2.t3_id = t3.id
WHERE t1.a = 'blah';
An example using the same tables as...
How to view method information in Android Studio?
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You can pin the window and make the documentation appear every time you select a method with your mouse though.
Android Studio 1.0: You have to hold CTRL if you want to get hold of documentation window for e.g. scrolling documentation otherwise as you move your mouse away from method document...
How do I dump the data of some SQLite3 tables?
...SOME_STRING' for something other than a comma.
.headers on
.out file.csv
select * from MyTable;
If you want to reinsert into a different SQLite database then:
.mode insert <target_table_name>
.out file.sql
select * from MyTable;
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Best TCP port number range for internal applications [closed]
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Short answer: use an unassigned user port
Over achiever's answer - Select and deploy a resource discovery solution. Have the server select a private port dynamically. Have the clients use resource discovery.
The risk that that a server will fail because the port it wants to listen on is n...