按值删除jsonb数组元素

本文介绍了按值删除jsonb数组元素的处理方法，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

我确实弄清楚了如何从单个记录的数组中删除一个值，但是如何对其中的许多记录执行删除操作.问题在于我如何使用子查询.由于它只返回单个元素.也许我的方法是错误的.

I did figure out how to remove a value from an array for a single record, but how to do it for many of them. The problem is in the way how I use the subquery. As it has to return only single element. Maybe my approach is wrong.

Given input: '{attributes:['is_new', 'is_old']}' Expected result '{attributes: ['is_old']}' #remove 'is_new' from jsonb array

Real example: # sku | properties # -------+-------------------------------- # nu3_1 | { + # | "name": "silly_hodgkin", + # | "type": "food", + # | "attributes": [ + # | "is_gluten_free", + # | "is_lactose_free", + # | "is_new" + # | ] + # | }

#Query that removes single array element: SELECT c.sku, jsonb_agg(el) FROM catalog c JOIN (select sku, jsonb_array_elements_text(properties->'attributes') as el from catalog) c2 ON c.sku=c2.sku where el 'is_new' GROUP BY c.sku;

#Update query that removes single array element in single record UPDATE catalog SET properties=jsonb_set(properties, '{attributes}', ( SELECT jsonb_agg(el) FROM catalog c JOIN (select sku, jsonb_array_elements_text(properties->'attributes') as el from catalog) c2 ON c.sku=c2.sku WHERE el 'is_new' AND c.sku='nu3_1' GROUP BY c.sku ) ) WHERE sku='nu3_1';

问题又来了.如何按值删除许多数据库记录的jsonb数组元素?

The question again is. How to remove jsonb array element by value for many database records?

推荐答案

使用 jsonb_set()和删除运算符- :

Use jsonb_set() and the delete operator -:

update catalog set properties = jsonb_set(properties, '{attributes}', (properties->'attributes') - 'is_new');

在rextester中对其进行测试.