Скачать или смотреть 🚀 Mastering MongoDB Conditional Operator: $cond Explained with Hands-On Examples!

Here's a complete set of YouTube metadata along with practical examples focused on MongoDB's conditional operator using $cond:

📌 Title:
🚀 Mastering MongoDB Conditional Operator: $cond Explained with Hands-On Examples!

📜 Description:
In this video, we'll dive deep into MongoDB's $cond operator—a powerful tool for introducing conditional logic into your aggregation pipelines. Discover how to evaluate conditions and decide which expression to return based on your dataset!
What you'll learn:
Overview of $cond:
Understand how $cond works as a ternary operator in MongoDB, evaluating a boolean expression and returning a value for either the true or false case.
Syntax Variations:
Learn the two primary syntaxes:
Object Syntax:
{
$cond: {
if: { $gte: ["$qty", 250] },
then: 30,
else: 20
}
}
Array Syntax:
{
$cond: [ { $gte: ["$qty", 250] }, 30, 20 ]
}
Practical Example:
We’ll use a sample inventory collection where we calculate a discount based on the quantity:
db.inventory.aggregate([
{
$project: {
item: 1,
discount: {
$cond: { if: { $gte: ["$qty", 250] }, then: 30, else: 20 }
}
}
}
])
This query returns a discount of 30 for items with a quantity of 250 or more, and 20 otherwise.
Advanced Use Cases:
Explore how you can integrate $cond in various scenarios, from field projections to conditional updates, ensuring your queries are both efficient and dynamic.
Whether you're a MongoDB beginner or looking to fine-tune your aggregation skills, this tutorial has something for everyone!
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