# Operate edge types¶

After a graph space is created in Nebula Graph, you can create edge types. With Studio, you can choose to use the Console page or the Schema page to create, retrieve, update, or delete edge types. This topic introduces how to use the Schema page to operate edge types in a graph space only.

## Prerequisites¶

To operate an edge type on the Schema page of Studio, you must do a check of these:

• Studio is connected to Nebula Graph.
• A graph space is created.

## Create an edge type¶

1. In the toolbar, click the Schema tab.

2. In the Graph Space List page, find a graph space and then click its name or click Schema in the Operations column.

3. In the Current Graph Space field, confirm the name of the graph space. If necessary, you can choose another name to change the graph space.

4. Click the Edge Type tab and click the + Create button.

5. On the Create Edge Type page, do these settings:

• Name: Specify an appropriate name for the edge type. In this example, serve is used.
• Comment (Optional): Enter the description for edge type.
• Define Properties (Optional): If necessary, click + Add Property to do these settings:

• Enter a property name.
• Select a data type.
• Select whether to allow null values..
• (Optional) Enter the default value.
• (Optional) Enter the description.
• Set TTL (Time To Live) (Optional): If no index is set for the edge type, you can set the TTL configuration: In the upper left corner of the Set TTL panel, click the check box to expand the panel, and configure TTL_COL and TTL_ DURATION (in seconds). For more information about both parameters, see TTL configuration.
6. When the preceding settings are completed, in the Equivalent to the following nGQL statement panel, you can see the nGQL statement equivalent to these settings.

7. Confirm the settings and then click the + Create button.

When the edge type is created successfully, the Define Properties panel shows all its properties on the list.

## Edit an edge type¶

1. In the toolbar, click the Schema tab.

2. In the Graph Space List page, find a graph space and then click its name or click Schema in the Operations column.

3. In the Current Graph Space field, confirm the name of the graph space. If necessary, you can choose another name to change the graph space.

4. Click the Edge Type tab, find an edge type and then click the button in the Operations column.

5. On the Edit page, do these operations:

• To edit a comment: Click Edit on the right of Comment.
• To edit a property: On the Define Properties panel, find a property, click Edit, and then change the data type or the default value.
• To delete a property: On the Define Properties panel, find a property, click Delete.
• To add more properties: On the Define Properties panel, click the Add Property button to add a new property.
• To set the TTL configuration: In the upper left corner of the Set TTL panel, click the check box and then set TTL.
• To delete the TTL configuration: When the Set TTL panel is expanded, in the upper left corner of the panel, click the check box to delete the configuration.
• To edit the TTL configuration: On the Set TTL panel, click Edit and then change the configuration of TTL_COL and TTL_DURATION (in seconds).

Note

For information about the coexistence problem of TTL and index, see [TTL]((../../3.ngql-guide/8.clauses-and-options/ttl-options.md).

## Delete an Edge type¶

Danger

Confirm the impact before deleting the Edge type. The deleted data cannot be restored if it is not backup.

1. In the toolbar, click the Schema tab.

2. In the Graph Space List page, find a graph space and then click its name or click Schema in the Operations column.

3. In the Current Graph Space field, confirm the name of the graph space. If necessary, you can choose another name to change the graph space.

4. Click the Edge Type tab, find an edge type and then click the button in the Operations column.

5. Click OK to confirm in the pop-up dialog box.

## Next to do¶

After the edge type is created, you can use the Console page to insert edge data one by one manually or use the Import page to bulk import edge data.

Last update: August 12, 2022