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QUESTION
Given I have 3 tables and I need to retrieve all the rows where there is no relationship with a specific record and include the rows where there are zero relationships, how can I build this query?
...ANSWER
Answered 2021-Jun-02 at 06:59SELECT * FROM books
WHERE id NOT IN
(SELECT bookid FROM books_authors WHERE authorid = 'A2')
QUESTION
following are my files for html, .ts and json . As json data was very extensive therefore i have just added a few states and their cities. my 1st dropdown is showing all states. Now I want to match my 1st dropdown's selected value of state with a key "state" in "cities" object in my json file so i can populate 2nd dropdown with cities relevant to that state. and I want to do this in function "getCitiesForSelectedState". please help me find solution for this.
//.ts file
...ANSWER
Answered 2021-Apr-27 at 16:44You can do it with the $event
parameter.
Make sure to compare your values safely.
If your value is not in the right type or has spaces or unwanted chars, this c.state == val
might not work.
You can use the trim
function to compare your value safely:
c.state.trim() == val.trim()
HTML
QUESTION
Let says I have two arraylists:
...ANSWER
Answered 2021-Apr-19 at 13:10There isn't, because List is a datatype that more or less explicitly means: Can contain duplicates.
In other words, List, if anything, has baked in that the second Dewey
is not redundant:
QUESTION
I have a list in React where I'm using .map
to render a loop from an array of elements.
The radio inputs are working perfectly, everyone is independent of the others, but I can't do the same for Select
.
The Select
area is changing in every field, I want it to change to it specified field like I did for the options.
I tried to re-use the same handleChange
that I used in the radios for it and instead I had this error.
ANSWER
Answered 2021-Apr-14 at 02:28Multiple Selects share the same state, resulting in updates the value on every field. So we need to wrap Select into components and maintain their own state independently:
QUESTION
I have a simple list where I have radio inputs for each element. They behave separately meaning that each selection changes the state of that specific element.
Now when I'm trying to set a default value option2
for
ANSWER
Answered 2021-Apr-12 at 23:22The problem is that your initial state is a string and you are using as a object in the handleChangeSelected
Just edit it to const [Selected, setSelected] = useState({});
Another tips:
- Try not to use capitalized names for variable that isn't a component
- Your list couldn't be a state
- Your id could be the index of the array
QUESTION
I have a simple list where in each li
there is radio inputs to choose from.
Whenever I select an option, all the inputs in all the other elements are updating with the same option.
I included a unique id
and a unique name
as mentionned in React docs to regroup each group and make it separate but it didn't work.
I want to be able to select every element separately in the list. How to do so ?
https://codesandbox.io/s/affectionate-sun-i2khx?file=/src/App.js
...ANSWER
Answered 2021-Apr-11 at 14:31If you can put selected
key in your intiallist array value then you can handle like below
QUESTION
I have 1000 points of county name data. (ok_field) Also, there are weather data for 1 to 10 days. (m) This data is a datalist.
(The size of the data is so large that if you use the data below as an example, I am grateful!)
...ANSWER
Answered 2021-Mar-11 at 06:50This uses a loop to populate the data frame that you desire.
QUESTION
I have posted a few days ago a question about a challenge that I did on jshero.net: The link for the question is [here]
I feel like I am close, the best answer I could come up with is:
...ANSWER
Answered 2020-Jun-20 at 17:22Just slice to the last element, and then append last element. Add a few checks for edge cases.
Seems like a really trivial problem. Not sure why all the overly complicated solutions. Am I misunderstanding the problem?
QUESTION
I'm trying out the tidy methods that Hadley Wickham describes in this video: https://www.youtube.com/watch?v=rz3_FDVt9eg&t=1902s. It's straightforward to get certain statistics this way, as long as there is only 1 row in the tidied data frame, but the slope of each linear model is buried in the 2nd row of a tidied data frame made with Broom. My code is very similar to Hadley's, and looks like this.
...ANSWER
Answered 2020-Oct-23 at 18:29You can just pick the 2nd element of the "estimate" column of the broom
output:
QUESTION
I have 2 arrays of objects and I need to add data to them based on matching ids. I can check every value in both arrays, check if their id matches and use them. One parent can have many children, but child can have only one parent. Code example:
...ANSWER
Answered 2020-Oct-01 at 10:12Personally I like for loops, mainly because they work well with async code too, but you could replace with forEach & find.
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