Re: join* tables from csv
You may also like this answer using DataScript to solve a similar problem:
http://stackoverflow.com/questions/39712460/how-to-map-different-values-from-2-sets-in-clojure-based-on-unique-value/39714081#39714081
On Tue, Oct 18, 2016 at 6:09 AM, Moe Aboulkheir wrote:
> (defn join* [d1 c1 d2 c2]
> (clojure.set/join (into #{} d1) (into #{} d2) {c1 c2}))
>
> Or else look at the implementation of set/join.
>
> Take care,
> Moe
>
> On Tue, Oct 18, 2016 at 9:41 AM, wrote:
>
>> Hey guys, i'm beginner and need help.
>>
>> I have a task:
>>
>> ;; (join* (join* student-subject :student_id student :id) :subject_id
>> subject :id)
>> ;; => [{:subject "Math", :subject_id 1, :surname "Ivanov", :year 1998,
>> :student_id 1, :id 1}
>> ;; {:subject "Math", :subject_id 1, :surname "Petrov", :year 1997,
>> :student_id 2, :id 2}
>> ;; {:subject "CS", :subject_id 2, :surname "Petrov", :year 1997,
>> :student_id 2, :id 2}
>> ;; {:subject "CS", :subject_id 2, :surname "Sidorov", :year 1996,
>> :student_id 3, :id 3}]
>> ;;
>> ;; Hint: reduce, conj, merge, first, filter, get
>> ;; Here column1 belongs to data1, column2 belongs to data2.
>> (defn join* [data1 column1 data2 column2]
>> )
>>
>> so.. i'm trying to write join (defn join* [data1 col1 data2 col2] ... )
>> data1 and data2 like: ({:key1 val1 :key2 val2} {:key1 val3 :key2 val4})
>> after => example result.
>>
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>
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Re: join* tables from csv
(defn join* [d1 c1 d2 c2]
(clojure.set/join (into #{} d1) (into #{} d2) {c1 c2}))
Or else look at the implementation of set/join.
Take care,
Moe
On Tue, Oct 18, 2016 at 9:41 AM, wrote:
> Hey guys, i'm beginner and need help.
>
> I have a task:
>
> ;; (join* (join* student-subject :student_id student :id) :subject_id
> subject :id)
> ;; => [{:subject "Math", :subject_id 1, :surname "Ivanov", :year 1998,
> :student_id 1, :id 1}
> ;; {:subject "Math", :subject_id 1, :surname "Petrov", :year 1997,
> :student_id 2, :id 2}
> ;; {:subject "CS", :subject_id 2, :surname "Petrov", :year 1997,
> :student_id 2, :id 2}
> ;; {:subject "CS", :subject_id 2, :surname "Sidorov", :year 1996,
> :student_id 3, :id 3}]
> ;;
> ;; Hint: reduce, conj, merge, first, filter, get
> ;; Here column1 belongs to data1, column2 belongs to data2.
> (defn join* [data1 column1 data2 column2]
> )
>
> so.. i'm trying to write join (defn join* [data1 col1 data2 col2] ... )
> data1 and data2 like: ({:key1 val1 :key2 val2} {:key1 val3 :key2 val4})
> after => example result.
>
> --
> You received this message because you are subscribed to the Google
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join* tables from csv
Hey guys, i'm beginner and need help.
I have a task:
;; (join* (join* student-subject :student_id student :id) :subject_id
subject :id)
;; => [{:subject "Math", :subject_id 1, :surname "Ivanov", :year 1998,
:student_id 1, :id 1}
;; {:subject "Math", :subject_id 1, :surname "Petrov", :year 1997,
:student_id 2, :id 2}
;; {:subject "CS", :subject_id 2, :surname "Petrov", :year 1997,
:student_id 2, :id 2}
;; {:subject "CS", :subject_id 2, :surname "Sidorov", :year 1996,
:student_id 3, :id 3}]
;;
;; Hint: reduce, conj, merge, first, filter, get
;; Here column1 belongs to data1, column2 belongs to data2.
(defn join* [data1 column1 data2 column2]
)
so.. i'm trying to write join (defn join* [data1 col1 data2 col2] ... )
data1 and data2 like: ({:key1 val1 :key2 val2} {:key1 val3 :key2 val4})
after => example result.
--
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Groups "Clojure" group.
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first post.
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