获取多个标签的最后一个值

Question

我需要获取每个sourceTag的最后一个值。请让我知道此查询是否正确。

SELECT * FROM "measurement1" where rig = '338' and ( sourceTag = 't1' or sourceTag = 
't2' or sourceTag = 't3' ) group by sourceTag order by time desc limit 1

Answer 1

差不多。只需将SELECT *更改为SELECT last(*)。