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taos> source tsim/query/t/multires_func.sql
taos> use test;
Database changed.

taos> select count(*) from tb\G;
*************************** 1.row ***************************
count(*): 3

taos> select last(*) from tb\G;
*************************** 1.row ***************************
ts: 2022-05-17 00:01:08.000
c0: 3
c1: 3.0000000
c2: cde

taos> select last_row(*) from tb\G;
*************************** 1.row ***************************
ts: 2022-05-17 00:01:08.000
c0: 3
c1: 3.0000000
c2: cde

taos> select first(*) from tb\G;
*************************** 1.row ***************************
ts: 2022-05-15 00:01:08.000
c0: 1
c1: 1.0000000
c2: abc