本文介绍了PostgreSQL的查询与“任意”不工作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

SELECT "Ticket_id"  FROM "Tickets"
 WHERE "Status" = 1 AND ("Ticket_id" !=  ANY(array[1,2,3])) Limit 6

和结果是1,2,3,4,5,6

And the result is 1,2,3,4,5,6

推荐答案

您想要使用所有,而不是任何。从:

You want to use ALL, not ANY. From the fine manual:

9.21.3。 ANY / SOME(阵列)

expression operator ANY (array expression)

[...]左侧前pression进行评估,并使用相比,数组的每个元素给定的运营商,它必须产生一个布尔结果。结果任何如果获得任何真正的结果就是真。

[...] The left-hand expression is evaluated and compared to each element of the array using the given operator, which must yield a Boolean result. The result of ANY is "true" if any true result is obtained.

因此​​,如果我们要说的是:

So if we say this:

1 != any(array[1,2])

然后我们会得到正确的,因为(1!= 1)或(1!= 2)是真实的。 任何本质上是一个运营商。例如:

then we'll get true since (1 != 1) or (1 != 2) is true. ANY is essentially an OR operator. For example:

=> select id from (values (1),(2),(3)) as t(id) where id != any(array[1,2]);
 id 
----
  1
  2
  3
(3 rows)

如果我们看一下<$c$c>ALL,我们看到:

If we look at ALL, we see:

9.21.4。 ALL(阵列)

expression operator ALL (array expression)

[...]左侧前pression进行评估,并使用相比,数组的每个元素给定的运营商,它必须产生一个布尔结果。 所有结果是真,如果所有的比较产生真正的...

[...] The left-hand expression is evaluated and compared to each element of the array using the given operator, which must yield a Boolean result. The result of ALL is "true" if all comparisons yield true...

因此​​,如果我们要说的是:

so if we say this:

1 != all(array[1,2])

然后我们会得到错误的,因为(1!= 1)和(1!= 2)是假的,我们将看到所有本质上是一个运营商。例如:

then we'll get false since (1 != 1) and (1 != 2) is false and we see that ALL is essentially an AND operator. For example:

=> select id from (values (1),(2),(3)) as t(id) where id != all(array[1,2]);
 id 
----
  3
(1 row)

如果要排除数组中的所有值,可以使用所有

If you want to exclude all values in an array, use ALL:

select "Ticket_id"
from "Tickets"
where "Status" = 1
  and "Ticket_id" != all(array[1,2,3])
limit 6

这篇关于PostgreSQL的查询与“任意”不工作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

10-14 04:49