crick | Crick is a backend for the Watson time-tracker | User Interface library
kandi X-RAY | crick Summary
kandi X-RAY | crick Summary
Crick is a backend for the [Watson] time-tracker, built during a "Le lab" session:. .
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QUESTION
Instructor table
ID name dept_name salary 10101 Srinivasan Comp. Sci. 65000.00 12121 Wu Finance 90000.00 15151 Mozart Music 40000.00 22222 Einstein Physics 95000.00 32343 El Said History 60000.00 33456 Gold Physics 87000.00 45565 Katz Comp. Sci. 75000.00 58583 Califieri History 62000.00 76543 Singh Finance 80000.00 76766 Crick Biology 72000.00 83821 Brandt Comp. Sci. 92000.00 98345 Kim Elec. Eng. 80000.00Teaches table
ID course_id sec_id semester year 76766 BIO-101 1 Summer 2017 76766 BIO-301 1 Summer 2018 10101 CS-101 1 Fall 2017 83821 CS-190 1 Spring 2017 83821 CS-190 2 Spring 2017 83821 CS-319 2 Spring 2018 10101 CS-347 1 Fall 2017 98345 EE-18 1 Spring 2017 22222 PHY-101 1 Fall 2017I tried this
...ANSWER
Answered 2021-Dec-27 at 16:13I don't know if below approach is your expected result but it might give you a hint if is not the solution to your problem.
QUESTION
SQL query: For each department, find the highest salary of instructors in that department.
Instructor schema: Instructor(ID , name, dept_name, salary) Id primary key, dept_name foreign key referencing department.
department(dept_name, building, budget)
Instructor table values:
...ANSWER
Answered 2021-Nov-09 at 06:22On MySQL 8+, this problem is easy to handle using RANK
:
QUESTION
I currently need to do the following:
Find the names of all course and the students enrolled on them which take place on a Friday afternoon and have at least 2 students enrolled on it.
I am thinking what I should do is Join the tables titled student, takes, course, section and time_slot together and from there do the SQL query, but this seems overkill to me.
First I would get a list of all the courses and all of the students names that take the courses by joining the takes and students tables.
Then, I would find all of the courses that take place on a Friday afternoon using the time_slot_id, which would have to be "D" OR "F" OR "G" and the day would be "F" to signify Friday. Then I would match the timeslot with the section.
After that I am stuck.
Here is what I have tried:
...ANSWER
Answered 2020-Nov-11 at 15:53OK... let's build this up using your strategy.
First I would get a list of all the courses and all of the students names that take the courses by joining the takes and students tables.
Your query below is the correct start for this - it finds all the courses which have more than one student.
QUESTION
I'm trying to speed up computation times associated with the raup-crick dissimilarity as calculated by Chase et al. 2011. In order to accomplish this, I am attempting to utilize parallel computing on a 32 core ubuntu based-machine which is running Rstudio server.
This is the code that I am using to try to run the computation in parallel. Rstudio is using two cores to process the computation (determined via htop) suggesting I have achieved some level of parallel computation. However, I would like Rstudio to use more cores as it has up to 32 at its disposal.
...ANSWER
Answered 2020-Aug-11 at 14:38As user12728748 suggested, the fix for this issue was issuing a value for the argument mc.cores = #L
QUESTION
I am studying SQL in my data science degree program, and the assignment is to perform SQL queries for the first time. In order to do that, I have to paste the SQL starter code in and run it. However, when I do, I hit an error that I can't solve. My class is online and my professor hasn't responded and, since this isn't part of the graded part of the assignment, I figured I'd try here to get help on this error.
Edit: It was pointed out that I didn't include all of the tables. Please see full code for all tables and all data. I was trying to avoid flooding this post with a lot of lines of code, but it seems I left out pertinent information. See below.
The tables were created with these blocks of code:
...ANSWER
Answered 2020-Feb-14 at 05:59There are two things here:
- the issue, and
- how to work out what the issue is.
Let's start with 2).
The error message is:
Result: FOREIGN KEY constraint failed
At line 1:
INSERT INTO teaches VALUES ('44444', 'MAT-114', '2', 'Fall', 2019);
That tells us to look at the foreign keys defined on the teaches
table.
There are 2:
- ID references the ID in instructor table (aside: maybe call this instructor_id instead of ID, it'll make more sense in 6 weeks when you come back to look at it).
- course_id, sec_id, semester, year reference the section table.
There is, in your data, an instructor with ID '44444', so that's probably not the problem.
But it doesn't look like there's a row in section
with 'MAT-114', '2', 'Fall', 2019
and that is likely your problem.
Note also that there's not one for 'MTH-114' like in the image, either.
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