各位用户为了找寻关于pgsql批量修改sequences的start方式的资料费劲了很多周折。这里教程网为您整理了关于pgsql批量修改sequences的start方式的相关资料，仅供查阅，以下为您介绍关于pgsql批量修改sequences的start方式的详细内容
修改为指定值
? 1 2 3 4 5 6 7DO $$DECLARE r record;
BEGIN
FOR r IN SELECT sequence_name FROM information_schema."sequences"
LOOP
EXECUTE 'ALTER SEQUENCE '|| r.sequence_name ||' restart WITH 10000';
END LOOP;
END$$;
根据表的id修改
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14DO $$
DECLARE
r record;
start_value integer := 0;
BEGIN
FOR r IN SELECT tablename||'_id_seq' AS sequence_name, tablename FROM pg_tables WHERE schemaname = 'public'
LOOP
EXECUTE 'SELECT max(id)+1 AS max_value FROM ' || r.tablename INTO start_value;
IF start_value IS NULL THEN start_value:= 1;
END IF;
RAISE NOTICE 'start_value % %', r.tablename,start_value;
EXECUTE 'ALTER SEQUENCE '|| r.sequence_name ||' restart WITH ' || start_value;
END LOOP;
END$$;
补充：postgresql 13 数据库 sequence 的 maxvalue 最大值是多少?
os: centos 7.8.2003
db: postgresql 13.0
版本
? 1 2 3 4 5 6 7 8 9 10# cat /etc/centos-release
CentOS Linux release 7.8.2003 (Core)
# su - postgres
Last login: Thu Oct 15 09:59:33 CST 2020 on pts/1
ppostgres@nodepg13-> psql -c "select version();"
version
---------------------------------------------------------------------------------------------------------
PostgreSQL 13.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit
(1 row)
create sequence
? 1 2 3 4 5 6 7 8 9$ psql
postgres=# create sequence seq_1;
CREATE SEQUENCE
postgres=# select c.relname,c.relkind,s.* from pg_class c,pg_sequence s where c.oid=s.seqrelid;
relname | relkind | seqrelid | seqtypid | seqstart | seqincrement | seqmax | seqmin | seqcache | seqcycle
---------+---------+----------+----------+----------+--------------+---------------------+--------+----------+----------
seq_1 | S | 40968 | 20 | 1 | 1 | 9223372036854775807 | 1 | 1 | f
(1 row)
?
1
2
3
4
5
seqmax = 9223372036854775807
maxvalue
NO MAXVALUE
The optional clause MAXVALUE maxvalue determines the maximum value for the sequence. If this clause is not supplied or NO MAXVALUE is specified, then default values will be used. The default for an ascending sequence is the maximum value of the data type. The default for a descending sequence is -1.
那就需要查看下 bigint 的值
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。
原文链接：https://blog.csdn.net/rantengfei1986/article/details/56670673
