Optimizing queries (#720)

* Adding documentation to reflect @Data-Nexus educational updates

* updated section

* heading edit

* Update website/pages/en/querying/querying-best-practices.mdx

Co-authored-by: Benoît Rouleau <[email protected]>

* Update website/pages/en/querying/querying-best-practices.mdx

Co-authored-by: Benoît Rouleau <[email protected]>

* Update website/pages/en/querying/querying-best-practices.mdx

Co-authored-by: Benoît Rouleau <[email protected]>

* Update website/pages/en/querying/querying-best-practices.mdx

Co-authored-by: Benoît Rouleau <[email protected]>

---------

Co-authored-by: Benoît Rouleau <[email protected]>

Author: idalithb

website/pages/en/querying/querying-best-practices.mdx

@@ -108,7 +108,7 @@ Now that we covered the basic rules of GraphQL queries syntax, let's now look at
 
 ---
 
-## Writing GraphQL queries
+## Best Practices
 
 ### Always write static queries
 
@@ -193,9 +193,7 @@ const result = await execute(query, {
 
 Note: The opposite directive is `@skip(if: ...)`.
 
-### Performance tips
-
-**"Ask for what you want"**
+### Ask for what you want
 
 GraphQL became famous for its "Ask for what you want" tagline.
 
@@ -224,7 +222,39 @@ The response could contain 100 transactions for each of the 100 tokens.
 
 If the application only needs 10 transactions, the query should explicitly set `first: 10` on the transactions field.
 
-**Combining multiple queries**
+### Use a single query to request multiple records
+
+By default, subgraphs have a singular entity for one record. For multiple records, use the plural entities and filter: `where: {id_in:[X,Y,Z]}` or `where: {volume_gt:100000}`
+
+Example of inefficient querying:
+
+```graphql
+query SingleRecord {
+  entity(id: X) {
+    id
+    name
+  }
+}
+query SingleRecord {
+  entity(id: Y) {
+    id
+    name
+  }
+}
+```
+
+Example of optimized querying:
+
+```graphql
+query ManyRecords {
+  entities(where: { id_in: [X, Y] }) {
+    id
+    name
+  }
+}
+```
+
+### Combine multiple queries in a single request
 
 Your application might require querying multiple types of data as follows: