Map item attribute properties
The following interface is displayed when configuring a Map Item attribute:
![](../__attachments/3904935802/att_1_for_3861119235.png?inst-v=c3007bf4-8f91-43d3-9633-90859273c945)
A Map item attribute allows you to access data within an element contained within a map value and indexed via a key.
A Map item attribute has the following specific properties:
Map Column: a mandatory database column, which contains the map data.
Key Value: a mandatory key, which is used to access a specific element within the map data. Key value can be a maximum of length 100 characters in length.
Data Type
Length: only displayed when Data Type I set to “String”.
Map Item attributes can reference data persisted as JSON. This feature is supported at the following database platforms:
Azure Database MySQL
Azure PostgreSQL
Azure SQL Database
Google BigQuery
PostgreSQL
SQL Server