The Sigma Query Language: Clusters

SELECT time
CLUSTER {time: 1,5}
FROM video1


SELECT x
CLUSTER {x: 2, 3}
FROM SELECT time
     CLUSTER {time: 1, 5}
     FROM video2

SELECT time CLUSTER {time: 1,5} FROM video1 SELECT x CLUSTER {x: 2, 3} FROM SELECT time CLUSTER {time: 1, 5} FROM video2