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QUESTION
Just out of curiosity, how exactly does SELECT * FROM table WHERE column = "something"
works?
Is the underlying principle same as that of a for/foreach
loop with an if
condition like:
ANSWER
Answered 2021-Jun-11 at 05:57SQL is a 4th generation language, which makes it very different from programming languages. Instead of telling the computer how to do something (loop through rows, compare columns), you tell the computer what to do (get the rows matching a condition).
The DBMS may or may not use a loop. It could as well use hashes and buckets, pre-sort a data set, whatever. It is free to choose.
On the technical side, you can provide an index in the datebase, so the DBMS can look up the keys to quickly to access the rows (like quickly finding names in a telephone book). This gives the DBMS an option how to acces the data, but it is still free to use a completely different approach, e.g. read the whole table sequentially.
QUESTION
I have a large DataFrame of distances that I want to classify.
...ANSWER
Answered 2021-Jun-08 at 20:36You can vectorize the calculation using numpy:
QUESTION
Reduced Excel Spreadsheet - Curiosity When clicking on cell B6 ( or 6 thru 11 ) , a disclosure caret shows and a popup is presented with the contents from a second sheet. It's not a pivot table, VLOOKUP is close. I don't know what it is called, so I can not research it further. All I need is a starting point. Thanks. Al
...ANSWER
Answered 2021-Jun-07 at 05:32In your case, "Data Validation" has been used:
- Select the range you want to have the desired behavior
- From the "Data" Tab, Choose "Data Validation"
- See Full Description
Similar behavior is achievable in "Developer Mode" as well:
- First Enable the Developer Tab from "File->Options->Customize Ribbon"
- Put into "Design Mode"
- Add Appropriate control (e.g.: Combo-box) via "Insert" button.
- Complete documentation is available here
QUESTION
Let's suppose I keep adding 5 GB of data every month. I understand that the first month cost will be based on capacity of 5GB and operations performed on that data. But now if next month I add, say 5GB more, would I be charged for a capacity of 10GB or only the new storage (5GB)?
As per my understanding cost of operations (read/write/tier-change) are on the size of data but what confuses me is the storage capacity, if I am billed for the cumulative capacity or just the new storage.
Please suggest and thanks in advance!!
(Note: I am already planning to apply tier level automation on the unused data, above query is out of curiosity and confusion on the billing specs mentioned here: https://azure.microsoft.com/en-in/pricing/details/storage/blobs/)
...ANSWER
Answered 2021-Jun-07 at 00:04You’re charged for the cumulative space.
Taking your example, for the first month you’ll not be charged anything as you’ve only stored 5GB data.
In the 2nd month you added 5GB more so the total data stored is 10GB. Considering first 5GB is free, you’ll only be charged for 5GB.
UPDATE
To answer your additional questions
So lets suppose the storage for the first month is over the free tier, say 5TB and 5TB more the next month, now the capacity cost next month is on 10TB or just the 5TB?
Storage costs are calculated on the total amount of data stored. In this case you will be charged for 10TB as the total amount of data stored in that month is 10TB (5TB from previous month + 5TB in the current month).
if I keep storing 5TB every month, it would be significantly more than the case where I keep archiving the old 5TB every month, is that so
That is correct. I am assuming that by archiving
you mean that you will be moving the data in archive
access tier. Please note that you will still be charged for the data that is there in the archive
access tier. It's just that you will be charged lesser for the data that's there in that tier but you will be charged as Azure Storage is storing that data for you.
To stop paying for the data storage costs, you will need to delete the data.
QUESTION
This question is more a curiosity of mine.
I have an component from where I redirect to another, using an query parameter:
comp A:
...ANSWER
Answered 2021-Jun-04 at 12:54Query parameters are sent as strings. Therefore it needs to be casted to assign to a number type.
QUESTION
Here is a simple example:
...ANSWER
Answered 2021-Jun-03 at 22:32The csv
package supports only one type of comment line. Choose one, and then delete the other. For instance:
QUESTION
Integer promotion works by promoting everything of an inferior rank to either int
or uint
. But why is this so?
It makes sense to make a difference between "upgrading" and "downgrading" a type. When you are converting a short
to a char
you may lose data.
However when going up in ranks (bool -> char -> short -> int -> long -> long long) there is no chance to lose data. If I have a char
it doesnt matter if I convert it to a short
or an int
, I still won't lose any data.
My question is why is int promotion only from a lower ranked type towards int
? Why was the decision made to have it like this? Why not towards the next higher ranked type for example (and the go on from there, try to promote again for example).
Seems to me that the implicit conversion semantics seem a bit arbitrary when you try to describe them. "most int
types can be "promoted", meaning a conversion with no possibility of data loss, but the promotion only works towards int
, not just any higher ranked type. If you convert anything to something else other than int
it is called a conversion"
Would it not be simpler to use the actual ranks of the int types to attempt a series of "promotions"? Or just to call any conversion towards a higher ranked int a "promotion"?
P.S. this is an educational question not one a bout a specific programming issue but rather for my own curiosity.
...ANSWER
Answered 2021-Jun-02 at 14:53In the C standard, Section 6.3.1.8 describes "Usual arithmetic conversions." (Added in C99, link is to C11 draft)
Many operators that expect operands of arithmetic type cause conversions and yield result types in a similar way. The purpose is to determine a common real type for the operands and result.
The C99 Rationale V5.10 describes the reason for this as:
Explicit license was added to perform calculations in a “wider” type than absolutely necessary, since this can sometimes produce smaller and faster code, not to mention the correct answer more often. Calculations can also be performed in a “narrower” type by the as if rule so long as the same end result is obtained. Explicit casting can always be used to obtain a value in a desired type.
From the rationale, it is reasonable to infer the committee sees this as the simplest solutions that captures the greatest number of possible uses.
From a simplicity standpoint, having a rank-by-rank promotion system would greatly increase the detail required to implement the standard. It would also create a wide variation of performance issues between platforms of different bit sizes. Programmers seeking to achieve specific objectives with data types are still given that flexibility through explicit casting of types.
QUESTION
Suppose a class defined as below,
...ANSWER
Answered 2021-May-28 at 13:02It's useful when you have a class hierarchy, and you want to be able to write methods in the base class which return instances of the derived class (such as this
):
QUESTION
I'm trying to pass an array of object to a childComponent as prop but when I add an object in it, it doesn't render. (Note: I'm working on vuejs 2.6)
I suppose it has a link with the "monitoring" of the items of the array and not the array itself? Stuff is that if I do not pass the prop and use the default value instead, it's working perfectly. I think I'm missing something here. Could someone help me ?
By curiosity is this kind of behavior still stand with vue3js ?
As you can see below:
App.vue:
...ANSWER
Answered 2021-May-28 at 13:17This is a bad way to work with props
Note: do not focus on Dev Tools too much as it can be "buggy" at times - especially if you use Vue in a wrong way. Focus on your app output
- Your
Card.vue
component is modifying (push
) a prop, which is not recommended but it sort of works if the prop is object/Array and you do not replace it, just modify it's content (as you do) - But in your case, the values passed to props are actually generated by a
method
! ThegetUserLinksFromUserId
method is generating a new array every time it is called, and this array is NOT reactive. So by pushing to it, your component will not re-render and what is worse, parent'slinks
array is not changed at all! (on top of that - ifApp.vue
ever re-renders, it will generate new arrays, pass it to pros and your modified arrys will be forgoten)
So intead of modifying links
prop in Card.vue
, just emit an event and do the modification in App.vue
QUESTION
I have successfully configured Bash completion for various Git aliases. For example:
...ANSWER
Answered 2021-May-26 at 20:34I was finally able to create a working solution with a bit of hackery around the "magic" Bash completion variables. I changed these variables to "pretend" we were completing the given command as given to git
itself.
If anybody has any suggestions to simplify this I would totally be open to suggestions.
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