我遇到了我的主键序列与我的表行不同步的问题。
也就是说，当我插入一个新行时，我得到一个重复的键错误，因为串行数据类型中隐含的序列返回一个已经存在的数字。
这似乎是由导入/恢复无法正确维护序列引起的。
答案 0 :(得分：634)
-- Login to psql and run the following
-- What is the result?
SELECT MAX(id) FROM your_table;
-- Then run...
-- This should be higher than the last result.
SELECT nextval('your_table_id_seq');
-- If it's not higher... run this set the sequence last to your highest id.
-- (wise to run a quick pg_dump first...)
BEGIN;
-- protect against concurrent inserts while you update the counter
LOCK TABLE your_table IN EXCLUSIVE MODE;
-- Update the sequence
SELECT setval('your_table_id_seq', COALESCE((SELECT MAX(id)+1 FROM your_table), 1), false);
COMMIT;
答案 1 :(得分：181)
pg_get_serial_sequence可用于避免对序列名称的任何错误假设。这会一次性重置序列：
SELECT pg_catalog.setval(pg_get_serial_sequence('table_name', 'id'), (SELECT MAX(id) FROM table_name)+1);
或者更简洁：
SELECT pg_catalog.setval(pg_get_serial_sequence('table_name', 'id'), MAX(id)) FROM table_name;
但是这个表格无法正确处理空表，因为max（id）为null，并且你也不能设置0，因为它超出了序列的范围。一种解决方法是采用ALTER SEQUENCE语法，即
ALTER SEQUENCE table_name_id_seq RESTART WITH 1;
ALTER SEQUENCE table_name_id_seq RESTART; -- 8.4 or higher
但ALTER SEQUENCE的用途有限，因为序列名称和重启值不能是表达式。
似乎最好的通用解决方案是使用false作为第3个参数调用setval，允许我们指定“使用下一个值”：
SELECT setval(pg_get_serial_sequence('t1', 'id'), coalesce(max(id),0) + 1, false) FROM t1;
这会勾选我的所有方框：
最后，请注意pg_get_serial_sequence仅在序列归列所有时才有效。如果将递增列定义为serial类型，则会出现这种情况，但是如果手动添加序列，则必须确保还执行ALTER SEQUENCE .. OWNED BY。
即。如果serial类型用于创建表，那么这一切都应该有效：
CREATE TABLE t1 (
id serial,
name varchar(20)
);
SELECT pg_get_serial_sequence('t1', 'id'); -- returns 't1_id_seq'
-- reset the sequence, regardless whether table has rows or not:
SELECT setval(pg_get_serial_sequence('t1', 'id'), coalesce(max(id),0) + 1, false) FROM t1;
但如果手动添加序列：
CREATE TABLE t2 (
id integer NOT NULL,
name varchar(20)
);
CREATE SEQUENCE t2_custom_id_seq
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1;
ALTER TABLE t2 ALTER COLUMN id SET DEFAULT nextval('t2_custom_id_seq'::regclass);
ALTER SEQUENCE t2_custom_id_seq OWNED BY t2.id; -- required for pg_get_serial_sequence
SELECT pg_get_serial_sequence('t2', 'id'); -- returns 't2_custom_id_seq'
-- reset the sequence, regardless whether table has rows or not:
SELECT setval(pg_get_serial_sequence('t2', 'id'), coalesce(max(id),0) + 1, false) FROM t1;
答案 2 :(得分：66)
最短，最快 方式：
SELECT setval('tbl_tbl_id_seq', max(tbl_id)) FROM tbl;
tbl_id是表tbl的{{3}}列，从序列tbl_tbl_id_seq（这是默认的自动名称）中提取。
如果您不知道所附序列的名称（不必采用默认格式），请使用serial：
SELECT setval(pg_get_serial_sequence('tbl', 'tbl_id'), max(tbl_id)) FROM tbl;
这里没有一个错误的错误。 pg_get_serial_sequence()
双参数表单将序列的last_value字段设置为 指定的值并将其
is_called字段设置为true，表示该字段 下一个nextval会在返回值之前推进序列。
大胆强调我的。
在上述查询中，没有针对并发序列活动的防御或对表的写入。如果相关，您可以 以独占模式锁定表格 。当您尝试同步时，它可以防止并发事务写入更高的数字。 （它还会临时阻止无害写入而不会弄乱最大数量。）
但它没有考虑到客户端可能已提前获取序列号而主表上没有任何锁定（但可能发生）。为了实现这一点，只有增加序列的当前值，永远不要减少它。它可能看起来很偏执，但这符合序列的性质并防范并发问题。
BEGIN;
LOCK TABLE tbl IN EXCLUSIVE MODE;
SELECT setval('tbl_tbl_id_seq', max(tbl_id))
FROM tbl
HAVING max(tbl_id) > (SELECT last_value FROM tbl_tbl_id_seq);
COMMIT;
答案 3 :(得分：49)
这将重置公开的所有序列，不对表名或列名进行假设。测试版本8.4
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text, columnname text, sequence_name text) RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( ''' || sequence_name || ''', ' || '(SELECT MAX(' || columnname || ') FROM ' || tablename || ')' || '+1)';
END;
$body$ LANGUAGE 'plpgsql';
select table_name || '_' || column_name || '_seq', reset_sequence(table_name, column_name, table_name || '_' || column_name || '_seq') from information_schema.columns where column_default like 'nextval%';
答案 4 :(得分：36)
ALTER SEQUENCE sequence_name RESTART WITH（SELECT max（id）FROM table_name）;
不起作用。
复制自@tardate回答：
SELECT setval(pg_get_serial_sequence('table_name', 'id'), MAX(id)) FROM table_name;
答案 5 :(得分：19)
此命令仅用于更改postgresql中自动生成的键序列值
ALTER SEQUENCE "your_sequence_name" RESTART WITH 0;
代替零，您可以输入要重新开始序列的任何数字。
默认序列名称为"TableName_FieldName_seq"。例如，如果您的表格名称为"MyTable"且您的字段名称为"MyID"，那么您的序列名称将为 "MyTable_MyID_seq" 。
这个答案与@ murugesanponappan的答案相同，但他的解决方案中存在语法错误。您无法在(select max()...)命令中使用子查询alter。因此，您必须使用固定数值，或者需要使用变量代替子查询。
答案 6 :(得分：16)
重置所有序列，不对名称做任何假设，除了每个表的主键是“id”：
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text, columnname text)
RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( pg_get_serial_sequence(''' || tablename || ''', ''' || columnname || '''),
(SELECT COALESCE(MAX(id)+1,1) FROM ' || tablename || '), false)';
END;
$body$ LANGUAGE 'plpgsql';
select table_name || '_' || column_name || '_seq', reset_sequence(table_name, column_name) from information_schema.columns where column_default like 'nextval%';
答案 7 :(得分：12)
当序列名，列名，表名或模式名称具有空格，标点符号等有趣字符时，这些函数充满了危险。我写了这个：
CREATE OR REPLACE FUNCTION sequence_max_value(oid) RETURNS bigint
VOLATILE STRICT LANGUAGE plpgsql AS $$
DECLARE
tabrelid oid;
colname name;
r record;
newmax bigint;
BEGIN
FOR tabrelid, colname IN SELECT attrelid, attname
FROM pg_attribute
WHERE (attrelid, attnum) IN (
SELECT adrelid::regclass,adnum
FROM pg_attrdef
WHERE oid IN (SELECT objid
FROM pg_depend
WHERE refobjid = $1
AND classid = 'pg_attrdef'::regclass
)
) LOOP
FOR r IN EXECUTE 'SELECT max(' || quote_ident(colname) || ') FROM ' || tabrelid::regclass LOOP
IF newmax IS NULL OR r.max > newmax THEN
newmax := r.max;
END IF;
END LOOP;
END LOOP;
RETURN newmax;
END; $$ ;
您可以通过向OID传递它来为单个序列调用它，它将返回任何具有默认序列的表所使用的最大数字;或者您可以使用这样的查询运行它，以重置数据库中的所有序列：
select relname, setval(oid, sequence_max_value(oid))
from pg_class
where relkind = 'S';
使用不同的qual可以仅重置某个模式中的序列，依此类推。例如，如果要调整“公共”模式中的序列：
select relname, setval(pg_class.oid, sequence_max_value(pg_class.oid))
from pg_class, pg_namespace
where pg_class.relnamespace = pg_namespace.oid and
nspname = 'public' and
relkind = 'S';
请注意，由于setval（）的工作原理，您无需在结果中添加1。
作为结束语，我必须警告一些数据库似乎有默认链接到序列的方式不会让系统目录有完整的信息。当您在psql的\ d：
中看到类似的内容时会发生这种情况alvherre=# \d baz
Tabla «public.baz»
Columna | Tipo | Modificadores
---------+---------+------------------------------------------------
a | integer | default nextval(('foo_a_seq'::text)::regclass)
请注意，除了:: regclass强制转换之外，该default子句中的nextval（）调用还有一个:: text强制转换。我认为这是因为数据库是旧的PostgreSQL版本的pg_dump。会发生的是上面的函数sequence_max_value（）将忽略这样的表。要解决此问题，您可以重新定义DEFAULT子句以直接引用序列而不使用强制转换：
alvherre=# alter table baz alter a set default nextval('foo_a_seq');
ALTER TABLE
然后psql正确显示它：
alvherre=# \d baz
Tabla «public.baz»
Columna | Tipo | Modificadores
---------+---------+----------------------------------------
a | integer | default nextval('foo_a_seq'::regclass)
只要你修复了这个问题，该函数就可以正常使用该表以及可能使用相同序列的所有其他函数。
答案 8 :(得分：6)
我的版本使用第一个，有一些错误检查...
BEGIN;
CREATE OR REPLACE FUNCTION reset_sequence(_table_schema text, _tablename text, _columnname text, _sequence_name text)
RETURNS pg_catalog.void AS
$BODY$
DECLARE
BEGIN
PERFORM 1
FROM information_schema.sequences
WHERE
sequence_schema = _table_schema AND
sequence_name = _sequence_name;
IF FOUND THEN
EXECUTE 'SELECT setval( ''' || _table_schema || '.' || _sequence_name || ''', ' || '(SELECT MAX(' || _columnname || ') FROM ' || _table_schema || '.' || _tablename || ')' || '+1)';
ELSE
RAISE WARNING 'SEQUENCE NOT UPDATED ON %.%', _tablename, _columnname;
END IF;
END;
$BODY$
LANGUAGE 'plpgsql';
SELECT reset_sequence(table_schema, table_name, column_name, table_name || '_' || column_name || '_seq')
FROM information_schema.columns
WHERE column_default LIKE 'nextval%';
DROP FUNCTION reset_sequence(_table_schema text, _tablename text, _columnname text, _sequence_name text) ;
COMMIT;
答案 9 :(得分：6)
从公共
重置所有序列CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text) RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( '''
|| tablename
|| '_id_seq'', '
|| '(SELECT id + 1 FROM "'
|| tablename
|| '" ORDER BY id DESC LIMIT 1), false)';
END;
$body$ LANGUAGE 'plpgsql';
select sequence_name, reset_sequence(split_part(sequence_name, '_id_seq',1)) from information_schema.sequences
where sequence_schema='public';
答案 10 :(得分：6)
这里有一些真正的硬核答案，我假设在问到这个问题的时候它曾经非常糟糕，因为这里的很多答案都不适用于9.3版本。自8.0版以来的documentation为这个问题提供了答案：
SELECT setval('serial', max(id)) FROM distributors;
此外，如果您需要处理区分大小写的序列名称，那就是这样做的：
SELECT setval('"Serial"', max(id)) FROM distributors;
答案 11 :(得分：5)
当使用实体框架创建数据库然后使用初始数据为数据库播种时，这个问题发生在我身上，这使得序列不匹配。
我通过创建在播种数据库后运行的脚本来解决它：
DO
$do$
DECLARE tablename text;
BEGIN
-- change the where statments to include or exclude whatever tables you need
FOR tablename IN SELECT table_name FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE' AND table_name != '__EFMigrationsHistory'
LOOP
EXECUTE format('SELECT setval(pg_get_serial_sequence(''"%s"'', ''Id''), (SELECT MAX("Id") + 1 from "%s"))', tablename, tablename);
END LOOP;
END
$do$
答案 12 :(得分：5)
全部放在一起
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text)
RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE 'SELECT setval( pg_get_serial_sequence(''' || tablename || ''', ''id''),
(SELECT COALESCE(MAX(id)+1,1) FROM ' || tablename || '), false)';
END;
$body$ LANGUAGE 'plpgsql';
将修复给定表的'id'序列（例如，通常需要使用django）。
答案 13 :(得分：5)
另一个plpgsql - 仅在max(att) > then lastval
do --check seq not in sync
$$
declare
_r record;
_i bigint;
_m bigint;
begin
for _r in (
SELECT relname,nspname,d.refobjid::regclass, a.attname, refobjid
FROM pg_depend d
JOIN pg_attribute a ON a.attrelid = d.refobjid AND a.attnum = d.refobjsubid
JOIN pg_class r on r.oid = objid
JOIN pg_namespace n on n.oid = relnamespace
WHERE d.refobjsubid > 0 and relkind = 'S'
) loop
execute format('select last_value from %I.%I',_r.nspname,_r.relname) into _i;
execute format('select max(%I) from %s',_r.attname,_r.refobjid) into _m;
if coalesce(_m,0) > _i then
raise info '%',concat('changed: ',_r.nspname,'.',_r.relname,' from:',_i,' to:',_m);
execute format('alter sequence %I.%I restart with %s',_r.nspname,_r.relname,_m+1);
end if;
end loop;
end;
$$
;
同时对--execute format('alter sequence行进行注释会给出列表，而不是实际重置值
答案 14 :(得分：5)
我建议在postgres wiki上找到这个解决方案。它会更新表格的所有序列。
SELECT 'SELECT SETVAL(' ||
quote_literal(quote_ident(PGT.schemaname) || '.' || quote_ident(S.relname)) ||
', COALESCE(MAX(' ||quote_ident(C.attname)|| '), 1) ) FROM ' ||
quote_ident(PGT.schemaname)|| '.'||quote_ident(T.relname)|| ';'
FROM pg_class AS S,
pg_depend AS D,
pg_class AS T,
pg_attribute AS C,
pg_tables AS PGT
WHERE S.relkind = 'S'
AND S.oid = D.objid
AND D.refobjid = T.oid
AND D.refobjid = C.attrelid
AND D.refobjsubid = C.attnum
AND T.relname = PGT.tablename
ORDER BY S.relname;
如何使用（来自postgres wiki）：
示例：
psql -Atq -f reset.sql -o temp
psql -f temp
rm temp
原始文章（也包含序列所有权修正）here
答案 15 :(得分：4)
之前我还没有尝试过代码：在下面我发帖 Klaus和user457226解决方案的sql-code版本 在我的电脑上工作[Postgres 8.3]，只有一些小调整 对于Klaus one和我的版本为user457226 one。
Klaus解决方案：
drop function IF EXISTS rebuilt_sequences() RESTRICT;
CREATE OR REPLACE FUNCTION rebuilt_sequences() RETURNS integer as
$body$
DECLARE sequencedefs RECORD; c integer ;
BEGIN
FOR sequencedefs IN Select
constraint_column_usage.table_name as tablename,
constraint_column_usage.table_name as tablename,
constraint_column_usage.column_name as columnname,
replace(replace(columns.column_default,'''::regclass)',''),'nextval(''','') as sequencename
from information_schema.constraint_column_usage, information_schema.columns
where constraint_column_usage.table_schema ='public' AND
columns.table_schema = 'public' AND columns.table_name=constraint_column_usage.table_name
AND constraint_column_usage.column_name = columns.column_name
AND columns.column_default is not null
LOOP
EXECUTE 'select max('||sequencedefs.columnname||') from ' || sequencedefs.tablename INTO c;
IF c is null THEN c = 0; END IF;
IF c is not null THEN c = c+ 1; END IF;
EXECUTE 'alter sequence ' || sequencedefs.sequencename ||' restart with ' || c;
END LOOP;
RETURN 1; END;
$body$ LANGUAGE plpgsql;
select rebuilt_sequences();
user457226解决方案：
--drop function IF EXISTS reset_sequence (text,text) RESTRICT;
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text,columnname text) RETURNS bigint --"pg_catalog"."void"
AS
$body$
DECLARE seqname character varying;
c integer;
BEGIN
select tablename || '_' || columnname || '_seq' into seqname;
EXECUTE 'SELECT max("' || columnname || '") FROM "' || tablename || '"' into c;
if c is null then c = 0; end if;
c = c+1; --because of substitution of setval with "alter sequence"
--EXECUTE 'SELECT setval( "' || seqname || '", ' || cast(c as character varying) || ', false)'; DOES NOT WORK!!!
EXECUTE 'alter sequence ' || seqname ||' restart with ' || cast(c as character varying);
RETURN nextval(seqname)-1;
END;
$body$ LANGUAGE 'plpgsql';
select sequence_name, PG_CLASS.relname, PG_ATTRIBUTE.attname,
reset_sequence(PG_CLASS.relname,PG_ATTRIBUTE.attname)
from PG_CLASS
join PG_ATTRIBUTE on PG_ATTRIBUTE.attrelid = PG_CLASS.oid
join information_schema.sequences
on information_schema.sequences.sequence_name = PG_CLASS.relname || '_' || PG_ATTRIBUTE.attname || '_seq'
where sequence_schema='public';
答案 16 :(得分：4)
重新检查公共架构函数中的所有序列
CREATE OR REPLACE FUNCTION public.recheck_sequence (
)
RETURNS void AS
$body$
DECLARE
_table_name VARCHAR;
_column_name VARCHAR;
_sequence_name VARCHAR;
BEGIN
FOR _table_name IN SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname = 'public' LOOP
FOR _column_name IN SELECT column_name FROM information_schema.columns WHERE table_name = _table_name LOOP
SELECT pg_get_serial_sequence(_table_name, _column_name) INTO _sequence_name;
IF _sequence_name IS NOT NULL THEN
EXECUTE 'SELECT setval('''||_sequence_name||''', COALESCE((SELECT MAX('||quote_ident(_column_name)||')+1 FROM '||quote_ident(_table_name)||'), 1), FALSE);';
END IF;
END LOOP;
END LOOP;
END;
$body$
LANGUAGE 'plpgsql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;
答案 17 :(得分：3)
要将所有序列重新启动为1，请使用：
-- Create Function
CREATE OR REPLACE FUNCTION "sy_restart_seq_to_1" (
relname TEXT
)
RETURNS "pg_catalog"."void" AS
$BODY$
DECLARE
BEGIN
EXECUTE 'ALTER SEQUENCE '||relname||' RESTART WITH 1;';
END;
$BODY$
LANGUAGE 'plpgsql';
-- Use Function
SELECT
relname
,sy_restart_seq_to_1(relname)
FROM pg_class
WHERE relkind = 'S';
答案 18 :(得分：3)
在下面的例子中，表名称是users，架构名称是public（默认架构），根据您的需求。
SELECT MAX(id) FROM public.users;
SELECT nextval('public."users_id_seq"');
max id 大于 next value，则重置它：SELECT setval('public."users_id_seq"',
(SELECT MAX(id) FROM public.users)
);
答案 19 :(得分：2)
这个答案是来自mauro的副本。
drop function IF EXISTS rebuilt_sequences() RESTRICT;
CREATE OR REPLACE FUNCTION rebuilt_sequences() RETURNS integer as
$body$
DECLARE sequencedefs RECORD; c integer ;
BEGIN
FOR sequencedefs IN Select
DISTINCT(constraint_column_usage.table_name) as tablename,
constraint_column_usage.column_name as columnname,
replace(replace(columns.column_default,'''::regclass)',''),'nextval(''','') as sequencename
from information_schema.constraint_column_usage, information_schema.columns
where constraint_column_usage.table_schema ='public' AND
columns.table_schema = 'public' AND columns.table_name=constraint_column_usage.table_name
AND constraint_column_usage.column_name = columns.column_name
AND columns.column_default is not null
ORDER BY sequencename
LOOP
EXECUTE 'select max('||sequencedefs.columnname||') from ' || sequencedefs.tablename INTO c;
IF c is null THEN c = 0; END IF;
IF c is not null THEN c = c+ 1; END IF;
EXECUTE 'alter sequence ' || sequencedefs.sequencename ||' minvalue '||c ||' start ' || c ||' restart with ' || c;
END LOOP;
RETURN 1; END;
$body$ LANGUAGE plpgsql;
select rebuilt_sequences();
答案 20 :(得分：2)
如果在为初始化加载自定义SQL数据时看到此错误，则另一种避免此错误的方法是：
而不是写作：
INSERT INTO book (id, name, price) VALUES (1 , 'Alchemist' , 10),
从初始数据中删除id（主键）
INSERT INTO book (name, price) VALUES ('Alchemist' , 10),
这使Postgres序列保持同步！
答案 21 :(得分：2)
我花了一个小时试图让djsnowsill回答使用混合案例表和专栏的数据库，然后由于Manuel Darveau的评论最终偶然发现了解决方案，但我想我可以做到每个人都清楚一点：
CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text, columnname text)
RETURNS "pg_catalog"."void" AS
$body$
DECLARE
BEGIN
EXECUTE format('SELECT setval(pg_get_serial_sequence(''%1$I'', %2$L),
(SELECT COALESCE(MAX(%2$I)+1,1) FROM %1$I), false)',tablename,columnname);
END;
$body$ LANGUAGE 'plpgsql';
SELECT format('%s_%s_seq',table_name,column_name), reset_sequence(table_name,column_name)
FROM information_schema.columns WHERE column_default like 'nextval%';
这有以下好处：
要解释一下，问题是pg_get_serial_sequence需要字符串来计算出你所指的内容，所以如果你这样做：
"TableName" --it thinks it's a table or column
'TableName' --it thinks it's a string, but makes it lower case
'"TableName"' --it works!
这是使用格式字符串中的''%1$I''来实现的，''使得撇号1$表示第一个参数，而I表示引号
答案 22 :(得分：1)
丑陋的黑客使用一些shell魔法修复它，不是一个很好的解决方案，但可能激发其他有类似问题的人：）
pg_dump -s <DATABASE> | grep 'CREATE TABLE' | awk '{print "SELECT setval(#" $3 "_id_seq#, (SELECT MAX(id) FROM " $3 "));"}' | sed "s/#/'/g" | psql <DATABASE> -f -
答案 23 :(得分：1)
克劳斯的回答是最有用的，有点想念：你 必须在select语句中添加DISTINCT。
但是，如果您确定没有表+列名称可以等效 对于两个不同的表，您还可以使用：
select sequence_name, --PG_CLASS.relname, PG_ATTRIBUTE.attname
reset_sequence(split_part(sequence_name, '_id_seq',1))
from PG_CLASS
join PG_ATTRIBUTE on PG_ATTRIBUTE.attrelid = PG_CLASS.oid
join information_schema.sequences
on information_schema.sequences.sequence_name = PG_CLASS.relname || '_' || PG_ATTRIBUTE.attname
where sequence_schema='public';
这是user457226解决方案的扩展，适用于何时 一些感兴趣的列名不是'ID'。
答案 24 :(得分：1)
select 'SELECT SETVAL(' || seq [ 1] || ', COALESCE(MAX('||column_name||')+1, 1) ) FROM '||table_name||';'
from (
SELECT table_name, column_name, column_default, regexp_match(column_default, '''.*''') as seq
from information_schema.columns
where column_default ilike 'nextval%'
) as sequense_query
答案 25 :(得分：0)
SELECT setval...使JDBC变得困难，所以这是一种与Java兼容的方法：
-- work around JDBC 'A result was returned when none was expected.'
-- fix broken nextval due to poorly written 20140320100000_CreateAdminUserRoleTables.sql
DO 'BEGIN PERFORM setval(pg_get_serial_sequence(''admin_user_role_groups'', ''id''), 1 + COALESCE(MAX(id), 0), FALSE) FROM admin_user_role_groups; END;';
答案 26 :(得分：0)
尝试reindex。
更新：正如评论中指出的那样，这是对原始问题的答复。
答案 27 :(得分：0)
一种更新模式中用作ID的所有序列的方法：
DO $$ DECLARE
r RECORD;
BEGIN
FOR r IN (SELECT tablename, pg_get_serial_sequence(tablename, 'id') as sequencename
FROM pg_catalog.pg_tables
WHERE schemaname='YOUR_SCHEMA'
AND tablename IN (SELECT table_name
FROM information_schema.columns
WHERE table_name=tablename and column_name='id')
order by tablename)
LOOP
EXECUTE
'SELECT setval(''' || r.sequencename || ''', COALESCE(MAX(id), 1), MAX(id) IS NOT null)
FROM ' || r.tablename || ';';
END LOOP;
END $$;
答案 28 :(得分：0)
只需运行以下命令：
SELECT setval('my_table_seq', (SELECT max(id) FROM my_table));
答案 29 :(得分：0)
这里有很多好的答案。重新加载Django数据库后，我也有同样的需求。
但是我需要：
这似乎与原始要求非常相似。
感谢Baldiry和Mauro使我走上了正轨。
drop function IF EXISTS reset_sequences(text[], text) RESTRICT;
CREATE OR REPLACE FUNCTION reset_sequences(
in_schema_name_list text[] = '{"django", "dbaas", "metrics", "monitor", "runner", "db_counts"}',
in_table_name text = '%') RETURNS text[] as
$body$
DECLARE changed_seqs text[];
DECLARE sequence_defs RECORD; c integer ;
BEGIN
FOR sequence_defs IN
select
DISTINCT(ccu.table_name) as table_name,
ccu.column_name as column_name,
replace(replace(c.column_default,'''::regclass)',''),'nextval(''','') as sequence_name
from information_schema.constraint_column_usage ccu,
information_schema.columns c
where ccu.table_schema = ANY(in_schema_name_list)
and ccu.table_schema = c.table_schema
AND c.table_name = ccu.table_name
and c.table_name like in_table_name
AND ccu.column_name = c.column_name
AND c.column_default is not null
ORDER BY sequence_name
LOOP
EXECUTE 'select max(' || sequence_defs.column_name || ') from ' || sequence_defs.table_name INTO c;
IF c is null THEN c = 1; else c = c + 1; END IF;
EXECUTE 'alter sequence ' || sequence_defs.sequence_name || ' restart with ' || c;
changed_seqs = array_append(changed_seqs, 'alter sequence ' || sequence_defs.sequence_name || ' restart with ' || c);
END LOOP;
changed_seqs = array_append(changed_seqs, 'Done');
RETURN changed_seqs;
END
$body$ LANGUAGE plpgsql;
然后执行并查看运行的更改：
select *
from unnest(reset_sequences('{"django", "dbaas", "metrics", "monitor", "runner", "db_counts"}'));
返回
activity_id_seq restart at 22
api_connection_info_id_seq restart at 4
api_user_id_seq restart at 1
application_contact_id_seq restart at 20
答案 30 :(得分：0)
所以我可以断言这个线程中没有足够的意见或创新的轮子，所以我决定加点香料。
以下是一个过程：
CREATE OR REPLACE PROCEDURE pg_reset_all_table_sequences(
IN commit_mode BOOLEAN DEFAULT FALSE
, IN mask_in TEXT DEFAULT NULL
) AS
$$
DECLARE
sql_reset TEXT;
each_sec RECORD;
new_val TEXT;
BEGIN
sql_reset :=
$sql$
SELECT setval(pg_get_serial_sequence('%1$s.%2$s', '%3$s'), coalesce(max("%3$s"), %4$s), false) FROM %1$s.%2$s;
$sql$
;
FOR each_sec IN (
SELECT
quote_ident(table_schema) as table_schema
, quote_ident(table_name) as table_name
, column_name
, coalesce(identity_start::INT, seqstart) as min_val
FROM information_schema.columns
JOIN pg_sequence ON seqrelid = pg_get_serial_sequence(quote_ident(table_schema)||'.'||quote_ident(table_name) , column_name)::regclass
WHERE
(is_identity::boolean OR column_default LIKE 'nextval%') -- catches both SERIAL and IDENTITY sequences
-- mask on column address (schema.table.column) if supplied
AND coalesce( table_schema||'.'||table_name||'.'||column_name = mask_in, TRUE )
)
LOOP
IF commit_mode THEN
EXECUTE format(sql_reset, each_sec.table_schema, each_sec.table_name, each_sec.column_name, each_sec.min_val) INTO new_val;
RAISE INFO 'Resetting sequence for: %.% (%) to %'
, each_sec.table_schema
, each_sec.table_name
, each_sec.column_name
, new_val
;
ELSE
RAISE INFO 'Sequence found for resetting: %.% (%)'
, each_sec.table_schema
, each_sec.table_name
, each_sec.column_name
;
END IF
;
END LOOP;
END
$$
LANGUAGE plpgsql
;
预览：
call pg_reset_all_table_sequences();
提交：
call pg_reset_all_table_sequences(true);
仅指定目标表：
call pg_reset_all_table_sequences('schema.table.column');