system.projections

SELECT * FROM system.projections LIMIT 2 FORMAT Vertical;

Linha 1:
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database:    default
table:       landing
name:        improved_sorting_key
type:        Normal
sorting_key: ['user_id','date']
query:       SELECT * ORDER BY user_id, date
settings:     {}

Linha 2:
──────
database:    default
table:       landing
name:        agg_no_key
type:        Aggregate
sorting_key: []
query:       SELECT count()
settings:     {}