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MongoDBquery~5 mins

limit method for pagination in MongoDB - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What does the limit() method do in MongoDB?
The limit() method restricts the number of documents returned by a query to a specified maximum number.
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beginner
How is limit() used for pagination in MongoDB?
You use limit() to set how many documents to show per page, often combined with skip() to move through pages.
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beginner
Example: What does db.collection.find().limit(5) do?
It returns only the first 5 documents from the collection that match the query.
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intermediate
Why combine skip() with limit() for pagination?
Because <code>skip()</code> moves past a number of documents, and <code>limit()</code> controls how many to show, together they let you fetch a specific page of results.
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intermediate
What happens if you use limit(0) in MongoDB?
Using limit(0) means no limit is applied, so all matching documents are returned.
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What does limit(10) do in a MongoDB query?
AReturns exactly 10 documents
BReturns all documents except 10
CReturns up to 10 documents
DSkips the first 10 documents
Which method is commonly used with limit() for pagination?
Askip()
BfindOne()
Csort()
Daggregate()
What will db.collection.find().limit(0) return?
ANo documents
BAll documents
COnly one document
DAn error
If you want to get the 3rd page of results with 5 documents per page, what should you use?
Askip(10).limit(5)
Bskip(15).limit(5)
Climit(15).skip(5)
Dlimit(5).skip(10)
Can limit() be used without skip() for pagination?
ANo, it always needs skip()
BNo, limit() is not for pagination
CYes, for any page
DYes, but only for the first page
Explain how you would use limit() and skip() together to show page 4 of a list with 10 items per page.
Think about how many items to skip before showing the next 10.
You got /3 concepts.
    Describe what happens if you use limit(0) in a MongoDB query and why it might be useful.
    Consider what 'no limit' means for the number of documents returned.
    You got /3 concepts.

      Practice

      (1/5)
      1. What does the limit() method do in MongoDB queries?
      easy
      A. It updates documents in the collection.
      B. It sorts the documents in ascending order.
      C. It skips a specified number of documents.
      D. It restricts the number of documents returned by the query.

      Solution

      1. Step 1: Understand the purpose of limit()

        The limit() method is used to control how many documents a query returns.

      2. Step 2: Compare with other methods

        Unlike sort() which orders documents, or skip() which skips documents, limit() restricts the count of results.

      3. Final Answer:

        It restricts the number of documents returned by the query. -> Option D

      4. Quick Check:

        limit() controls result count = D [OK]
      Hint: Limit sets max results returned, like page size [OK]
      Common Mistakes:
      • Confusing limit with skip
      • Thinking limit sorts results
      • Assuming limit updates data
      2. Which of the following is the correct syntax to limit a MongoDB query to 5 documents?
      easy
      A. db.collection.find().limit(5)
      B. db.collection.limit(5).find()
      C. db.collection.find().skip(5)
      D. db.collection.find(5).limit()

      Solution

      1. Step 1: Recall the correct method chaining

        In MongoDB, limit() is chained after find() to restrict results.

      2. Step 2: Validate syntax correctness

        db.collection.find().limit(5) uses db.collection.find().limit(5), which is the correct syntax. Other options misuse method order or parameters.

      3. Final Answer:

        db.collection.find().limit(5) -> Option A

      4. Quick Check:

        Correct chaining is find() then limit() = A [OK]
      Hint: Use find() first, then limit(n) to restrict results [OK]
      Common Mistakes:
      • Placing limit before find
      • Using skip instead of limit
      • Passing number inside find()
      3. Given the collection products with documents: [{"name":"A"},{"name":"B"},{"name":"C"},{"name":"D"}], what will db.products.find().limit(2).toArray() return?
      medium
      A. [{"name":"A"},{"name":"B"},{"name":"C"}]
      B. [{"name":"C"},{"name":"D"}]
      C. [{"name":"A"},{"name":"B"}]
      D. An error because limit cannot be used here

      Solution

      1. Step 1: Understand the default order of find()

        Without sorting, find() returns documents in insertion order: A, B, C, D.

      2. Step 2: Apply limit(2) to restrict results

        Using limit(2) returns only the first two documents: A and B.

      3. Final Answer:

        [{"name":"A"},{"name":"B"}] -> Option C

      4. Quick Check:

        limit(2) returns first 2 docs = A [OK]
      Hint: Limit returns first N documents in default order [OK]
      Common Mistakes:
      • Assuming limit returns last documents
      • Expecting sorted results without sort()
      • Thinking limit causes errors
      4. What is wrong with this query for pagination? 
      db.users.find().limit(10).skip(5)
      medium
      A. The query is missing a sort() method for consistent pagination.
      B. The order of limit and skip is incorrect; it causes a syntax error.
      C. limit cannot be used with skip in the same query.
      D. There is no error; the query is correct.

      Solution

      1. Step 1: Check method order validity

        In MongoDB, chaining limit() and skip() in any order is syntactically valid.

      2. Step 2: Identify pagination best practice

        For consistent pagination, a sort() is needed to ensure stable document order across pages.

      3. Final Answer:

        The query is missing a sort() method for consistent pagination. -> Option A

      4. Quick Check:

        Pagination needs sort() for stable results = B [OK]
      Hint: Always add sort() for reliable pagination [OK]
      Common Mistakes:
      • Thinking the order causes a syntax error
      • Believing limit and skip can't be combined
      • Ignoring the need for sort()
      5. You want to show page 3 of a product list with 4 items per page, sorted by price ascending. Which query correctly uses limit() and skip() for this pagination?
      hard
      A. db.products.find().skip(4).limit(3).sort({price:1})
      B. db.products.find().sort({price:1}).skip(8).limit(4)
      C. db.products.find().limit(4).skip(8).sort({price:1})
      D. db.products.find().sort({price:1}).limit(3).skip(4)

      Solution

      1. Step 1: Calculate skip value for page 3

        Each page has 4 items, so page 3 skips 2 pages: 2 * 4 = 8 documents to skip.

      2. Step 2: Apply sort, skip, and limit in correct order

        Sort by price ascending first, then skip 8 documents, then limit to 4 documents for the page size.

      3. Final Answer:

        db.products.find().sort({price:1}).skip(8).limit(4) -> Option B

      4. Quick Check:

        Page 3 skip=8, limit=4, sorted = C [OK]
      Hint: Skip (page-1)*size, then limit size after sort [OK]
      Common Mistakes:
      • Mixing skip and limit order
      • Wrong skip calculation for page
      • Missing sort for consistent order