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chore(curriculum): changed external links to news articles in 4 challenges (#43373)

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* changed 4 links

* fix wording

* change link as suggested by @gikf
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Ilenia
2021-09-27 10:12:53 +02:00
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curriculum/challenges/english/10-coding-interview-prep/rosetta-code/hash-join.md
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@ -8,7 +8,7 @@ dashedName: hash-join
# --description--
An [inner join](https://en.wikipedia.org/wiki/Join_(SQL)#Inner_join "wp: Join\_(SQL)#Inner_join") is an operation that combines two data tables into one table, based on matching column values. The simplest way of implementing this operation is the [nested loop join](<https://en.wikipedia.org/wiki/Nested loop join> "wp: Nested loop join") algorithm, but a more scalable alternative is the [hash join](<https://en.wikipedia.org/wiki/hash join> "wp: hash join") algorithm.
An [inner join](https://www.freecodecamp.org/news/sql-join-types-inner-join-vs-outer-join-example/#how-to-use-an-inner-join-in-sql "news: SQL Join Types – Inner Join VS Outer Join Example#How to Use an INNER JOIN in SQL") is an operation that combines two data tables into one table, based on matching column values. The simplest way of implementing this operation is the [nested loop join](<https://en.wikipedia.org/wiki/Nested loop join> "wp: Nested loop join") algorithm, but a more scalable alternative is the [hash join](<https://en.wikipedia.org/wiki/hash join> "wp: hash join") algorithm.
The "hash join" algorithm consists of two steps: