PostgreSQL =ANY 和 IN

Question

最近我读了 Quantified Comparison Predicates – Some of SQL’s Rarest Species:

In fact, the SQL standard defines the IN predicate as being just syntax sugar for the = ANY() quantified comparison predicate.

8.4 <in predicate>

Let RVC be the <row value predicand> and 
let IPV be the <in predicate value>.

The expression  RVC IN IPV
is equivalent to  RVC = ANY IPV

很公平，基于其他答案，例如：What is exactly “SOME / ANY” and “IN” or Oracle: '= ANY()' vs. 'IN ()' 我假设我可以互换使用它们。

下面是我的例子：

select 'match'
where 1 = any( string_to_array('1,2,3', ',')::int[])
-- match

select 'match'
where 1 IN ( string_to_array('1,2,3', ',')::int[])
-- ERROR:  operator does not exist: integer = integer[]
-- HINT:  No operator matches the given name and argument type(s).
-- You might need to add explicit type casts.

DB Fiddle

问题是为什么第一个查询有效而第二个 returns 错误？

Answer 1

那是因为 IN（不同于 ANY）不接受数组作为输入。只有 set（来自子查询）或 list 值。详细解释：

PostgreSQL =ANY 和 IN

PostgreSQL =ANY and IN

sql

postgresql

sql-in