A query is a request an app makes to its database to fetch or filter specific data, returning only the records that match what it asked for. In app building, it's how every screen that shows saved information, like a profile, a list, or search results, gets what it needs to display.
Query
Why queries matter
Almost every useful app stores data and shows some of it back. A query is the step in between. When a user opens their order history or searches for a product, a query runs behind the scenes to pull exactly those records out of the database.
Get queries right and screens load fast with the correct data. Get them wrong and users see the wrong records, missing information, or a slow app. Because queries decide what data reaches the screen, they quietly shape how accurate and responsive your whole app feels.
How queries work
A query describes what you want, not how to find it. It names the records to return and the conditions they must meet, like "all orders from this user, newest first." The database does the work of locating them and hands back just the matching results.
On Emergent, the agent builds the backend that runs your queries against a MongoDB database, so you don't write query code yourself. You describe the data a screen should show in plain language, and the agent creates the query that fetches it.
Query examples
A user opens the "my bookings" page in a travel app. Behind that page, a query asks the database for every booking where the user ID matches the logged-in person and the trip date is in the future, sorted by soonest first. The database returns just those bookings, and the page displays them. The user's past trips and everyone else's bookings stay out of the result.
Frequently Asked Questions
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