流式SQL数据库：PipelineDB
PipelineDB是一个开源的关系数据库，采用持续数据流式运行SQL查询。增量存储结果在表中。
没有应用代码
PipelineDB enables realtime data processing using only SQL. Our continuous query planner and execution engine handle all of the complexity of running realtime computation on streams.
兼容PostgreSQL
PipelineDB is built into the PostgreSQL core and can be used as a drop in replacement for PostgreSQL without making any application code changes. It comes pre-installed with PostGIS and supports all other extensions too.
No ETL
PipelineDB eliminates the ETL layer. Stream granular data directly into the database and continuously distill it with the SQL queries you’ve declared.
高效和可持续
PipelineDB stores only the output of continuous queries, which are incrementally updated as data is ingested. The database’s size is independent of the amount of data ingested over time.