From b4b86967d93ea41155c45db535e8e44e6cc46323 Mon Sep 17 00:00:00 2001 From: "urishapira@microsoft.com" Date: Mon, 29 Dec 2025 10:06:42 +0200 Subject: [PATCH] Add note --- data-explorer/kusto/query/schema-entities/external-tables.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/data-explorer/kusto/query/schema-entities/external-tables.md b/data-explorer/kusto/query/schema-entities/external-tables.md index 1e6860cfc6..eee336a754 100644 --- a/data-explorer/kusto/query/schema-entities/external-tables.md +++ b/data-explorer/kusto/query/schema-entities/external-tables.md @@ -47,7 +47,7 @@ To accelerate queries over external delta tables, see [Query acceleration policy > [!NOTE] > > * The maximum limit of external tables per database is 1,000. -> * External table names are case-sensitive, and can't overlap with Kusto table names. For more information, see [Identifier naming rules](entity-names.md#identifier-naming-rules). +> * External table names are case-sensitive, and can't overlap with Kusto table names. Column names must also follow Kusto identifier naming rules; tables that contain an asterisk (`*`) in any column name aren't supported, because `*` is a reserved character in Kusto. For more information, see [Identifier naming rules](entity-names.md#identifier-naming-rules). > * Azure Data Explorer supports [export](../../management/data-export/export-data-to-an-external-table.md) and [continuous export](../../management/data-export/continuous-data-export.md) to an external table. > * [Data purge](../../concepts/data-purge.md) isn't applied on external tables. Records are never deleted from external tables. > * [Row level security policy](../../management/row-level-security-policy.md) can't be configured on external tables.