DARYNA-TKACHENKO-W2-DATABASE #18
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crevulus
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crevulus
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Hi Daryna,
There's an issue I've raised in my comments - there's important data missing, so I can't review your code fully! Please fix this, along with the other comments, and then I can leave a full review.
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| import { client } from './database.js'; | |||
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This file name contains a trailing whitespace. This can cause issues for running your scripts. Be careful of whitespace when naming.
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Week2/assigments/relationships.js
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| INSERT INTO authors (author_name) | ||
| VALUES | ||
| ('Daryna Tkachenko'), | ||
| ('Andrii Shevchenko'), |
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Great choice of names! ⚽
However, you're missing quite a lot of data from this table. I'm unable to verify exercises 3 and 4 because of missing data from the authors table.
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| await client.query(` |
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here you're doubling-up your work. You have already created the table as part of an earlier exercise. No need to do it again.
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| await client.query(` | ||
| CREATE TABLE author_paper ( | ||
| author_id INT, |
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well done for achieving this in one query instead of two 👍
Week2/assigments/relationships.js
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| (13, 25), (13, 26), | ||
| (14, 27), (14, 28), | ||
| (15, 29), (15, 30) | ||
| ON CONFLICT DO NOTHING; |
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This is a good habit, but it's not strictly necessary because there's no UNIQUE constraint on author_paper
Week2/assigments/joins.js
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| console.table(mentorResult.rows); | ||
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| const papersQuery = ` | ||
| SELECT a.author_id, |
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There's an easier way to select all columns without having to write out each one. Can you remember what it is?
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| const papersCountQuery = ` | ||
| SELECT rp.paper_title, | ||
| COUNT(ap.author_id) AS author_count |
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This runs, but you might want to be more specific and declare where you want to select the paper titles and author ids from. Otherwise, postgres will implicitly assume which table to use. Which in this case is okay, but in a real production database may cause issues.
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