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如何获取 max_value 和 min_value Postgres 序列？

我使用此语句创建了序列

create sequence seqtest increment 1 minvalue 0 maxvalue 20;

我尝试这个查询select max_value from seqtest给出错误

ERROR:  column "max_value" does not exist
LINE 1: select max_value from seqtest;
HINT:  Perhaps you meant to reference the column "seqtest.last_value".

输出select * from seqtest

test=# select * from seqtest;

-[ RECORD 1 ]-
last_value | 0
log_cnt    | 0
is_called  | f