zlen
ZLEN
Return the number of members in the key
Usage: zlen key. Same as ZCARD.
List uses LLEN, Hash uses HLEN, and Stream uses XLEN, while Set and ZSet use CARD. SLEN and ZLEN were added so the names are easier to remember.
Example
| Command> | zadd myzip 9926 "Seoul" 3426 "Busan" 2465 "Daegu" 2826 "Incheon" 1514 "Gwangju" 12137 "Gyeonggi" |
| Result> | 6 |
| Command> | zadd myzip 1500 "Gangwon" 2060 "Chungnam" 2641 "Gyeongbuk" 570 "Jeju" |
| Result> | 4 |
| Command> | zlen myzip |
| Result> |
10
|
|
The data above is 2013 population by city/province (unit: thousands).
|
Syntax
ZLEN key
- Available since Enterprise version 7.
- Time complexity is O(1).
Commands
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