Why do commands related to redis ordered collections start with Z?

Which word abbreviation is

Z?

Mar.20,2021

the author's original words
Z represents the Z of XYZ, so look at it from another angle: order. Although this association is far away.

Hello. Z is as in XYZ, so the idea is, sets with another dimension: the
order. It's a far association. I know:)

when the number of elements is less than 64, the data structure of ziplist is used when the time complexity is O (n), and the data structure of ziplist with time complexity of O (n), unordered set is that the s in set,sadd refers to the set set, so the z in zadd should refer to ziplist.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b37078-2c046.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37078-2c046.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?