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Added JavaScript and mongosh tabs to challenge solutions
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‎docs/40-CRUD/1-WHERE.mdx‎

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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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# 👐 WHERE → .find()
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Similar to SQL's `WHERE` clause, the `.find()` method in MongoDB retrieves documents from a collection that matches a specified query.
@@ -91,31 +94,77 @@ Now, translate the following into a MongoDB query.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.find({ totalInventory: 5 });
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const cursor = await books.find({ totalInventory: 5 });
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await cursor.forEach((b) => {
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console.log(b);
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});
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.find({ totalInventory: 5 });
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```
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</div>
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</TabItem>
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</Tabs>
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</details>
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#### 2. Find all books with more than 300 pages.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.find({ pages: {$gt: 300} });
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const cursor = await books.find({ pages: {$gt: 300} });
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await cursor.forEach((b) => {
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console.log(b);
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});
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.find({ pages: {$gt: 300} });
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```
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</div>
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</TabItem>
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</Tabs>
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</details>
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#### 3. Find books in the `Science` genre that are more than 300 pages long.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.find({ "genre.name": "Science", pages: {$gt: 300} });
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const cursor = await books.find( { "genre.name": "Science", pages: {$gt: 300} } );
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await cursor.forEach((b) => {
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console.log(b);
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});
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.find({ "genre.name": "Science", pages: {$gt: 300} });
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```
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</div>
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</TabItem>
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</Tabs>
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</details>

‎docs/40-CRUD/2-SELECT.mdx‎

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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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# 👐 SELECT → projection
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In SQL, the `SELECT` statement allows us to specify which columns to retrieve from a table. Similarly, in MongoDB, we use **projection** in the `.find()` method to control which fields to include (or exclude) in query results.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.find({}, {title: 1, _id: 0});
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const cursor = await books.find({}).project( {title: 1, _id: 0} ).limit(10);
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await cursor.forEach((b) => {
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console.log(b);
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});
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.find({}, {title: 1, _id: 0});
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```
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</div>
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</TabItem>
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</Tabs>
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</details>
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### 👐 2. Retrieve all fields except `_id` and `authors` for books in the "History" genre.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.find({ "genre.name": "History" }, { _id: 0, authors: 0 });
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const cursor = await books.find({ "genre.name": "History" }).project( { _id: 0, authors: 0 } ).limit(10);
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await cursor.forEach((b) => {
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console.log(b);
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});
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.find({ "genre.name": "History" }, { _id: 0, authors: 0 });
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```
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</div>
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</TabItem>
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</Tabs>
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</details>

‎docs/40-CRUD/3-ORDER-LIMIT.mdx‎

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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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# 👐 ORDER BY → .sort() & LIMIT → .limit()
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In SQL, we use `ORDER BY` to sort query results and `LIMIT` to restrict the number of returned rows. MongoDB provides the `.sort()` and `.limit()` methods to achieve the same.
@@ -64,9 +67,24 @@ This returns the **top 10 available books** in the "Science Fiction" genre.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.find({}).sort({title: 1}).limit(10)
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const cursor = await books.find({}).sort({title: 1}).limit(10);
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await cursor.forEach((b) => {
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console.log(b);
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});
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.find({}).sort({title: 1}).limit(10)
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```
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</div>
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</TabItem>
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</Tabs>
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</details>

‎docs/40-CRUD/4-INSERT-DELETE.mdx‎

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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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# 👐 INSERT → insertOne() & DELETE → deleteOne()
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MongoDB provides two methods for inserting documents into a collection:
@@ -67,45 +70,94 @@ DELETE FROM reviews WHERE bookId = '0786222727';
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.reviews.insertMany([
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{
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text: "Thrilling end.",
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rating: 4,
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name: "Mark",
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bookId: "0786222727",
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},
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{
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text: "Must read!",
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rating: 5,
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name: "Raj",
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bookId: "0786222727",
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},
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{
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text: "Very expensive",
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rating: 3,
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name: "Yun",
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bookId: "0786222727",
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},
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{
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text: "Extremely satisfied with the storyline!",
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rating: 5,
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name: "Lisa",
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bookId: "0786222727",
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}
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]);
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const reviews = db.collection("reviews");
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await reviews.insertMany([
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{
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text: "Thrilling end.",
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rating: 4,
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name: "Mark",
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bookId: "0786222727",
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},
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{
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text: "Must read!",
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rating: 5,
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name: "Raj",
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bookId: "0786222727",
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},
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{
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text: "Very expensive",
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rating: 3,
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name: "Yun",
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bookId: "0786222727",
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},
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{
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text: "Extremely satisfied with the storyline!",
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rating: 5,
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name: "Lisa",
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bookId: "0786222727",
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}
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]);
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.reviews.insertMany([
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{
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text: "Thrilling end.",
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rating: 4,
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name: "Mark",
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bookId: "0786222727",
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},
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{
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text: "Must read!",
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rating: 5,
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name: "Raj",
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bookId: "0786222727",
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},
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{
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text: "Very expensive",
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rating: 3,
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name: "Yun",
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bookId: "0786222727",
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},
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{
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text: "Extremely satisfied with the storyline!",
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rating: 5,
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name: "Lisa",
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bookId: "0786222727",
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}
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]);
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```
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</div>
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</TabItem>
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</Tabs>
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</details>
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### 👐 2. Delete all the reviews for `bookId` "0786222727" through a single command.
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.reviews.deleteMany({"bookId": "0786222727"})
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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const reviews = db.collection("reviews");
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await reviews.deleteMany({"bookId": "0786222727"})
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.reviews.deleteMany({"bookId": "0786222727"})
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```
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</div>
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</TabItem>
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</Tabs>
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</details>

‎docs/40-CRUD/5-UPDATE.mdx‎

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import Tabs from "@theme/Tabs";
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import TabItem from "@theme/TabItem";
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# 👐 UPDATE → updateOne(), updateMany()
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To modify existing documents, MongoDB provides:
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<details>
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<summary>Answer</summary>
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<div>
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```js
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db.books.updateOne(
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{"title": "Treasure of the Sun"},
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{$set: {pages: 449}}
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);
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```
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</div>
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<Tabs groupId="challenges" defaultValue={"javascript"}>
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<TabItem value="javascript" label="JavaScript">
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<div>
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```js
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await books.updateOne(
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{"title": "Treasure of the Sun"},
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{$set: {pages: 449}}
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);
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```
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</div>
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</TabItem>
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<TabItem value="mongosh" label="mongosh">
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<div>
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```js
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db.books.updateOne(
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{"title": "Treasure of the Sun"},
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{$set: {pages: 449}}
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);
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```
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</div>
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</TabItem>
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</Tabs>
93110
</details>

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