taos> select MAX(current) from ts_4893.meters max(current) | ======================= 11.999 | taos> select MAX(voltage) from ts_4893.meters max(voltage) | =============== 224 | taos> select MAX(name) from ts_4893.meters max(name) | ================================= x | taos> select MAX(nch1) from ts_4893.meters max(nch1) | ================================= 一二三四五六七八九十 | taos> select MAX(nch2) from ts_4893.meters max(nch2) | ================================= 四 | taos> select MAX(var1) from ts_4893.meters max(var1) | ================================= 一二三四五六七八九十 | taos> select MAX(var2) from ts_4893.meters max(var2) | ================================= 四 | taos> select MAX(id) from ts_4893.meters interval(60d) max(id) | ============== 1110 | 2838 | 4566 | 6294 | 8022 | 9750 | 9999 | 3206 | 4934 | 6662 | 8390 | 9999 | 1846 | 3574 | 5302 | 7030 | 8758 | 9999 | 2214 | 3942 | 5670 | 7398 | 9126 | 9999 | 2582 | 4310 | 6038 | 7766 | 9494 | 9999 | 2950 | 4678 | 6406 | 8134 | 9862 | 9999 | 3318 | 5046 | 6774 | 8502 | 9999 | 1958 | 3686 | 5414 | 7142 | 8870 | 9999 | 2326 | 4054 | 5782 | 7510 | 9238 | 9999 | 2694 | 4422 | 6150 | 7878 | 9606 | 9999 | taos> select MAX(current) from ts_4893.meters interval(60d) max(current) | ======================= 11.999 | 11.997 | 11.997 | 11.999 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.998 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.998 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.998 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.998 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.998 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.998 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.999 | 11.999 | 11.999 | 11.999 | 11.997 | 11.999 | 11.999 | 11.999 | 11.986 | taos> select MAX(voltage) from ts_4893.meters interval(60d) max(voltage) | =============== 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | 224 | taos> select MAX(name) from ts_4893.meters interval(60d) max(name) | ================================= x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | x | taos> select MAX(nch1) from ts_4893.meters interval(60d) max(nch1) | ================================= 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | taos> select MAX(nch2) from ts_4893.meters interval(60d) max(nch2) | ================================= 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | taos> select MAX(var1) from ts_4893.meters interval(60d) max(var1) | ================================= 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | 一二三四五六七八九十 | taos> select MAX(var2) from ts_4893.meters interval(60d) max(var2) | ================================= 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | 四 | taos> select max(null) from ts_4893.meters max(null) | ======================== NULL | taos> select max(id) from ts_4893.meters max(id) | ============== 9999 | taos> select max(id) from ts_4893.meters where id > 0 max(id) | ============== 9999 | taos> select max(id) from ts_4893.meters where id <= 0 max(id) | ============== 0 | taos> select max(phase) from ts_4893.meters where ts between '2023-01-01 00:00:00' and '2023-12-31 23:59:59' max(phase) | ======================= 0.999966 | taos> select max(voltage) from ts_4893.meters where voltage is not null max(voltage) | =============== 224 | taos> select max(total_voltage) from (select sum(voltage) as total_voltage from ts_4893.meters group by location) max(total_voltage) | ======================== 21948660 | taos> select round(max(current), 2) from ts_4893.meters round(max(current), 2) | ========================= 1.2000000e+01 | taos> select pow(max(current), 2) from ts_4893.meters pow(max(current), 2) | ============================ 143.975991296219 | taos> select log(max(voltage) + 1) from ts_4893.meters log(max(voltage) + 1) | ============================ 5.41610040220442 | taos> select groupid, max(voltage) from ts_4893.meters group by groupid order by groupid groupid | max(voltage) | ========================= 1 | 224 | taos> select location, max(id) from ts_4893.meters group by location order by location location | max(id) | =================================== beijing | 9999 | taos> select location, max(current) from ts_4893.meters group by location order by location location | max(current) | ============================================ beijing | 11.999 | taos> select max(1) max(1) | ======================== 1 | taos> select max(cast(1 as tinyint)) max(cast(1 as tinyint)) | ========================== 1 | taos> select max(cast(100 as smallint)) max(cast(100 as smallint)) | ============================= 100 | taos> select max(cast(100000 as int)) max(cast(100000 as int)) | =========================== 100000 | taos> select max(cast(10000000000 as bigint)) max(cast(10000000000 as bigint)) | =================================== 10000000000 | taos> select max(cast(1 as tinyint unsigned)) max(cast(1 as tinyint unsigned)) | =================================== 1 | taos> select max(cast(100 as smallint unsigned)) max(cast(100 as smallint unsigned)) | ====================================== 100 | taos> select max(cast(100000 as int unsigned)) max(cast(100000 as int unsigned)) | ==================================== 100000 | taos> select max(cast(10000000000 as bigint unsigned)) max(cast(10000000000 as bigint unsigned)) | ============================================ 10000000000 | taos> select max(cast(1.1 as float)) max(cast(1.1 as float)) | ========================== 1.1000000e+00 | taos> select max(cast(1.1 as double)) max(cast(1.1 as double)) | ============================ 1.1 |