Selecting tuples from multiple data streams and performing computational processing to consolidate these tuples into a single tuple is called joining data streams.
This subsection explains a query that joins data streams, using an example that first joins two data streams (temperature and humidity), and then joins tuples from the same observation site. The following figure shows the input and output data present when this query is executed.
Figure 2-20 Input and output data present when a query that joins data streams is executed
REGISTER STREAM temperature_stream |