Get the property "LongestSpan" of the bridge entity "GoldenGate":

Use to discover names of entities and properties:

Find out how many entities are available in a given type:

Extract properties from an EntityClass:

Use EntityValue to query an external database:

Extract multiple properties at once:

Extract a property from multiple entities:

Extract all properties as an association:

Apply an EntityFunction to a single Entity:

Extract properties from a complex entity class:

Extract properties from an EntityInstance:

Use Dated to extract values at a specified time:

Use property qualifiers to specify the date of a property:

Discover available qualifiers and values for a property:

Use for discovery:

When the output of EntityValue involves other entities, these can be fed back into EntityValue:

Use the lists of entities and properties to get multiple results:

The output from time series data can typically be fed directly to DateListPlot:

Get a list of sample entities for an entity type:

List the available properties for an entity type:

List entity classes:

List sample entity classes:

Get an Association for a list of entities:

Get an Association for all properties of an entity:

Get an Association for a list of properties:

Get an Association for lists of entities and/or properties:

EntityValue will cache results for many property values:

These cached values persist across Wolfram System sessions:

When dealing with external databases, one might encounter a database where the primary key was not set for some tables:

When this happens, EntityStore will emit a message. This means that some functionality involving single entities will be disabled:

But EntityValue will generally keep working:

The only way around this problem is to set the primary key constraint in the external database.