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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
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+1; I've tried the formula in Maple for select numbers and it works. I still couldn't convince myself WHY it works, though.
– polygenelubricants
Aug 16 '10 at 11:12
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Storyboard - refer to ViewController in AppDelegate
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If you use XCode 5 you should do it in a different way.
Select your UIViewController in UIStoryboard
Go to the Identity Inspector on the right top pane
Check the Use Storyboard ID checkbox
Write a unique id to the Storyboard ID field
Then write your code.
// Override point for ...
What's the difference between HEAD^ and HEAD~ in Git?
... commit with only one parent, rev~ and rev^ mean the same thing. The caret selector becomes useful with merge commits because each one is the child of two or more parents — and strains language borrowed from biology.
HEAD^ means the first immediate parent of the tip of the current branch. HEAD^ is...
Display open transactions in MySQL
... the current transaction list in InnoDB with the query below if you want.
SELECT * FROM information_schema.innodb_trx\G
From the document:
The INNODB_TRX table contains information about every transaction (excluding read-only transactions) currently executing inside InnoDB, including whether t...
SQLAlchemy: Creating vs. Reusing a Session
...nging around in that Session, when you access them you'll get a single-row SELECT for each one of them as they each individually refresh their state in terms of the new transaction.
– zzzeek
Sep 27 '15 at 18:16
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Why use argparse rather than optparse?
... defining arguments. (My source recommends: Why Click)
python-inquirer For selection focused tools and based on Inquirer.js (repo)
If you need a more in-depth comparison please read this and you may end up using docopt or click. Thanks to Kyle Purdon!
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What's the best way of structuring data on firebase?
...data and a SQL environment is querying data. There's no simple way to say "SELECT USERS WHERE X = Y", because of the real-time nature of the data (it's constantly changing, sharding, reconciling, etc, which requires a simpler internal model to keep the synchronized clients in check)
A simple exampl...
Add missing dates to pandas dataframe
... fill data for missing labels, (including by forward/backward filling) (4) select rows by label!
– unutbu
Oct 11 '13 at 18:36
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How do I copy directories recursively with gulp?
... is the important part. That expression is a glob which is a powerful file selection tool. For example, for copying only .js files use: 'input/folder/**/*.js'
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How to 'bulk update' with Django?
...each essentially having the form of the first example above) + the initial SELECT-query.
If every row requires a unique value there is no way to avoid one query per update. Perhaps look into other architectures like CQRS/Event sourcing if you need performance in this latter case.
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