## Updating schemas
- When you update a schema by removing a data field, that field is automatically removed from existing records. - When you update a schema by adding a new data field, existing records are **not** automatically updated to include any value.
1. Go to Data Modeling icon **Data Modeling Hub > Schema Builder**. 2. In the list of schemas, locate the schema to delete and click Three dot icon. 3. In the menu that opens, click **Edit**. **Result:** the schema creation screen opens. 1. Edit the schema in the same way as in [Creating schemas](/docs/assets/schema-builder/creating-schemas). ## Previewing schemas You can check what the schema looks like when a user adds records manually. 1. Go to Data Modeling icon **Data Modeling Hub > Schema Builder**. 2. In the list of schemas, locate the schema to delete and click Three dot icon. 3. In the menu that opens, click **Preview**. **Result:** The preview opens. ## Duplicating schemas When you duplicate a schema, an identical schema is created under the name ` - copy`. The new schema does not contain any records. 1. Go to Data Modeling icon **Data Modeling Hub > Schema Builder**. 2. In the list of schemas, locate the schema to delete and click Three dot icon. 3. In the menu that opens, click **Duplicate**. **Result:** The schema is duplicated. ## Deleting schemas
When you delete a schema, all data records stored in that schema are also deleted.
1. Go to Data Modeling icon **Data Modeling Hub > Schema Builder**. 2. In the list of schemas, locate the schema to delete and click Three dot icon. 3. In the menu that opens, click **Delete**. **Result:** The schema and all its records are deleted.