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content/500-support/100-help-articles/300-finding-entities-based-on-relation.mdx

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+---
+title: 'Querying models based on their relations existence'
+metaTitle: 'Querying models based on their relations existence'
+metaDescription: 'Learn how you can query for entities where their relation exists or not'
+---
+
+## Problem
+
+Common use cases when querying for relations from a database are:
+
+-  finding all the entities for table X where the relation Y doesn't exist
+- finding all the entities for table X where the relation Y has at least one item 
+
+Taking a concrete example of users and posts as entities, this would translate to _"find the users that haven't created any posts"_ and _"find the users that have created at least one post"_. 
+
+Read below to learn how this can be achieved with Prisma.
+
+## Solution
+
+Consider this Prisma schema:
+
+```prisma
+model User {
+  id    Int    @id @default(autoincrement())
+  name  String
+  posts Post[]
+}
+
+model Post {
+  id     Int   @id @default(autoincrement())
+  user   User? @relation(fields: [userId], references: [id])
+  userId Int?
+}
+```
+
+You can now query for the **users that do not have any posts** as follows:
+
+```js
+await prisma.user.findMany({
+  where: { posts: { none: {} } },
+})
+```
+
+This query returns all the users that haven't created any posts yet.
+
+In a similar way, you can query for **users that created at least one post** as follows:
+
+```js
+await prisma.user.findMany({
+  where: { posts: { some: {} } },
+})
+```
+
+This query returns all the users that created at least one post.
+
+This article showed how you can query for entities based on if the relation exists.