SUNIONCARD

Since 1.1.0Sets

Syntax

SUNIONCARD numkeys key [key ...] [APPROX] [LIMIT limit]
  • Flags: movablekeys, readonly
  • ACL categories: @read, @set, @slow
  • Arity: -2

Returns how many members the union of the given sets has, without returning them: a command of Redis 8.10. numkeys is how many keys follow. LIMIT limit stops counting at limit. APPROX is accepted, for compatibility; the count is always exact.

Reply

  • The count.

Examples

> SADD x a b c d
(integer) 4
> SADD y c d e
(integer) 3
> SUNIONCARD 2 x y
(integer) 5
> SUNIONCARD 2 x y LIMIT 3
(integer) 3