system.projections

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Description

Contient des informations sur les projections existantes de toutes les tables.

Colonnes

database (String) — Nom de la base de données.
table (String) — Nom de la table.
name (String) — Nom de la projection.
type (Enum8('Normal' = 0, 'Aggregate' = 1)) — Type de projection.
sorting_key (Array(String)) — Clé de tri de la projection.
query (String) — Requête de la projection.
settings (Map(String, String)) — Paramètres de la projection.

Exemple

SELECT * FROM system.projections LIMIT 2 FORMAT Vertical;

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

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