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SQL, Modeling, and Streaming Design
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SQL, Modeling, and Streaming Design

MediumSQL · PostgreSQL

Problem

Tell me about your approach to SQL data modeling and designing a streaming data system, including how you would implement it. For the hands-on portion, use the supplied relational tables to identify each actor's latest processed event while preserving actors with no qualifying event.

Output

  1. One row per actor, including actors without a qualifying event
  2. Columns: actor_id, actor_name, event_type, event_ts, sequence_id
  3. Order by actor_id ascending, with NULL event fields for actors without a qualifying event

Schema

actors
ColumnTypeDescription
actor_idPKINTStable identifier for an actor
actor_nameVARCHAR(100)Display name of the actor
stream_events
ColumnTypeDescription
sequence_idPKBIGINTUnique monotonically increasing event sequence
actor_idINTActor associated with the event
event_typeVARCHAR(50)Logical type of the event
event_tsTIMESTAMPEvent occurrence timestamp
statusVARCHAR(20)Processing status of the event
Tablesactorsstream_events
Interviewer

Your question is SQL, Modeling, and Streaming Design. Start with the requirements and the two tables in the Question tab.

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CodePostgreSQL
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