Query that returns all tags

hi,
i’m working with influx db.
i have to get a tag value. explication : when i try : show tag key , my db return :

name: mqtt_consumer
tagKey

topic

i want to do a query with select statement that returns all my topics. i use it with javascript and vuejs and i think that a show statement does not return anything.

thanx for help

This page maybe helpful?

https://docs.influxdata.com/influxdb/v1.8/query_language/explore-schema/#show-tag-values

If not, pls share more info one what your table looks like, and what detail you need the query to return.