YDB | simple PHP utility library to use Yaml files | Database library
kandi X-RAY | YDB Summary
kandi X-RAY | YDB Summary
YDB is a simple PHP utility library to use Yaml as a flat file databases. YDB is a PHP library used by Morebec in some client projects to allow the use of yaml files as a database. Some of our clients have technical abilities to view and edit YAML files and therefore want their projects to save all their data using this format in such a way that when they require it, they can manually update the data themselves. It also provides the benifit of applying VCS on the database's data. YDB therfore provides an easy way to communicate with such a database in a simple and efficient way. It offers functionalities, like table management, table schema updates and data indexing for improved performance, as well as a custom SQL like language called YQL that allows to query the database in a more user-friendly manner.
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QUESTION
I am currently learning the M/MUMPS programming language and would like to import a CSV file to store for later use with the MUMPS global array system.
I have found an example of code from the Mumpster site (I modified the infile statement to point to another directory, from the original code on the site):
...ANSWER
Answered 2021-Jun-21 at 16:01You just need an extra space before the u 0 w...
QUESTION
Create table
...ANSWER
Answered 2020-Dec-20 at 15:20From the documentation link that you provided in the comments I see that the databse that you use does not support a statement equivalent to INSERT OR IGNORE...
to suppress errors if a unique constraint is violated.
As an alternative you can use INSERT ... SELECT
.
If your database supports EXISTS
:
QUESTION
I am trying to solve this practise problem on SQLite.
Find the difference between the average rating of movies released before 1980 and the average rating of movies released after 1980. (Make sure to calculate the average rating for each movie, then the average of those averages for movies before 1980 and movies after. Don't just calculate the overall average rating before and after 1980.
Data is here:
This is what I got so far (for the first group <1980):
...ANSWER
Answered 2020-Aug-05 at 11:26First, don't aggregate by the title
. It is the id that distinguishes the movies, not the title (which could be repeated in theory).
You can use conditional aggregation:
QUESTION
I've got a question for my assignment
Question: For all cases where the same reviewer rated the same movie twice and gave it a higher rating the second time, return the reviewer's name and the title of the movie.
Here's what I've tried. I joined all the tables.
...ANSWER
Answered 2020-Aug-02 at 15:38Join what you already had with Rating
again, so that you can get all records where the reviewer is the same and the movie is the same, then filter only rows where a record with a later ratingDate
has more stars.
In case the same reviewer did review 3 or more times, then use select distinct
to remove duplicates
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