在Postgres 9.4或更高版本中，这是最简单和最快的:

SELECT c.*
FROM   comments c
JOIN   unnest('{1,3,2,4}'::int[]) WITH ORDINALITY t(id, ord) USING (id)
ORDER  BY t.ord;

WITH ORDINALITY was introduced with in Postgres 9.4. No need for a subquery, we can use the set-returning function like a table directly. (A.k.a. "table-function".) A string literal to hand in the array instead of an ARRAY constructor may be easier to implement with some clients. For convenience (optionally), copy the column name we are joining to ("id" in the example), so we can join with a short USING clause to only get a single instance of the join column in the result. Works with any input type. If your key column is of type text, provide something like '{foo,bar,baz}'::text[].

详细解释:

PostgreSQL unnest()与元素号

在Postgres 9.4或更高版本中，这是最简单和最快的:

SELECT c.*
FROM   comments c
JOIN   unnest('{1,3,2,4}'::int[]) WITH ORDINALITY t(id, ord) USING (id)
ORDER  BY t.ord;

WITH ORDINALITY was introduced with in Postgres 9.4. No need for a subquery, we can use the set-returning function like a table directly. (A.k.a. "table-function".) A string literal to hand in the array instead of an ARRAY constructor may be easier to implement with some clients. For convenience (optionally), copy the column name we are joining to ("id" in the example), so we can join with a short USING clause to only get a single instance of the join column in the result. Works with any input type. If your key column is of type text, provide something like '{foo,bar,baz}'::text[].

详细解释:

PostgreSQL unnest()与元素号

你可以很容易地使用(在PostgreSQL 8.2中引入)VALUES()，()。

语法是这样的:

select c.*
from comments c
join (
  values
    (1,1),
    (3,2),
    (2,3),
    (4,4)
) as x (id, ordering) on c.id = x.id
order by x.ordering

无序列，只适用于8.4:

select * from comments c
join 
(
    select id, row_number() over() as id_sorter  
    from (select unnest(ARRAY[1,3,2,4]) as id) as y
) x on x.id = c.id
order by x.id_sorter

在Postgres中另一种方法是使用idx函数。

SELECT *
FROM comments
ORDER BY idx(array[1,3,2,4], comments.id)

不要忘记首先创建idx函数，如下所述:http://wiki.postgresql.org/wiki/Array_Index

select * from comments where comments.id in 
(select unnest(ids) from bbs where id=19795) 
order by array_position((select ids from bbs where id=19795),comments.id)

这里，[bbs]是主表，它有一个名为ids的字段， id是存储注释的数组。id。

在postgresql 9.6中通过