teledb=# select sum(id) from teledb_pg; sum ----- 11 (1 row)求最大值。teledb=# select max(id) from teledb_pg; max ----- 4 (1 row)求最小值。teledb=# select min(id) from teledb_pg; min ----- 1 (1 row)求平均值。
teledb=# select sum(id) from teledb_pg; sum ----- 11 (1 row)求最大值。teledb=# select max(id) from teledb_pg; max ----- 4 (1 row)求最小值。teledb=# select min(id) from teledb_pg; min ----- 1 (1 row)求平均值。