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Why NSUserDefaults failed to save NSMutableDictionary in iOS?
...e all of your keys in the dictionary NSStrings? I think they have to be in order to save the dictionary to a property list.
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What is the difference between using IDisposable vs a destructor in C#?
... class to exist when it runs (they may have already been cleaned up as the order in which destructors run in is not garanteed).
IDisposible should be used whenever you have an object that creates resources that need cleaning up (ie, file and graphics handles). In fact, many argue that anything you ...
Easy way to pull latest of all git submodules
...I am pretty sure that git does not have a command for this internally. In order to do so, you would need to identify what HEAD really is for a submodule. That could be as simple as saying master is the most up to date branch, etc...
Following this, create a simple script that does the following:
...
Numbering rows within groups in a data frame
...r) and library(dplyr) answers to make the ranking val column in descending order?
– Przemyslaw Remin
Jul 24 '18 at 9:31
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How can I combine multiple rows into a comma-delimited list in Oracle? [duplicate]
..._name , ','), 2) csv
FROM (SELECT country_name , ROW_NUMBER () OVER (ORDER BY country_name ) rn,
COUNT (*) OVER () cnt
FROM countries)
WHERE rn = cnt
START WITH rn = 1
CONNECT BY rn = PRIOR rn + 1;
CSV ...
How to jQuery clone() and change id?
...ID
Say you have many elements with IDs like klon--5 but scrambled (not in order). Here we cannot go for :last or :first, therefore we need a mechanism to retrieve the highest ID:
const $all = $('[id^="klon--"]');
const maxID = Math.max.apply(Math, $all.map((i, el) => +el.id.match(/\d+$/g)[...
How do I measure execution time of a command on the Windows command line?
... output: command took 0:1:-1.99 (59.99s total) You should reverse the order of the 4 lines that do "lss 0" comparisons, so that the carry progresses correctly from low to high sexagesimal digits. Then the output becomes: command took 0:0:59.99 (59.99s total)
– Jean-Fra...
Putting git hooks into repository
...t is created.
The template directory will be one of the following (in order):
the argument given with the --template option;
the contents of the $GIT_TEMPLATE_DIR environment variable;
the init.templateDir configuration variable; or
the default template directory: /usr/share/git-c...
Grouped LIMIT in PostgreSQL: show the first N rows for each group?
I need to take the first N rows for each group, ordered by custom column.
5 Answers
5
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SQL JOIN - WHERE clause vs. ON clause
...
They are not the same thing.
Consider these queries:
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
WHERE Orders.ID = 12345
and
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
AND Orders.ID = 12345
The first will return an order ...