sql - Postgres 检查 jsonb 数组是否不包含值返回空结果集

Question

需要检查 jsonb 列是否包含值。 Jsonb 字段是一个简单的数组:

ALTER TABLE task ADD COLUMN worker_ids jsonb;

UPDATE task SET worker_ids = '["1", "2"]' WHERE ...

然后尝试运行查询来检查它是否包含具体值:

检查 jsonb 是否包含值的查询 - 工作正常并返回正确的行集

 SELECT * FROM task WHERE worker_ids ? '1'

然而，当我将 NOT 添加到 where 条件查询时，什么都不返回:

 SELECT * FROM task WHERE NOT worker_ids ? '1'

我是不是弄错了什么？

Answer 1

https://www.postgresql.org/docs/current/static/functions-comparison.html

Ordinary comparison operators yield null (signifying “unknown”), not true or false, when either input is null. For example, 7 = NULL yields null, as does 7 <> NULL. When this behavior is not suitable, use the IS [ NOT ] DISTINCT FROM predicates:

类似于:

SELECT * FROM task WHERE (worker_ids ? '1') is distinct from true

应该可以