PostgreSQL：從JSONB列中刪除值

Question

我需要從jsonb類型列中刪除一些值。

jsonb值

{"services": [59, 61], "locations": ["34"]}

該查詢不起作用。

select jsonb_set(data, '{services}', (data->'services') - 59) from employees 
WHERE data @> '{"services":[59]}';

但是，這可行：

select jsonb_set(data, '{locations}', (data->'locations') - '34') from 
employees WHERE data @> '{"services":[59]}';

如何從沒有鍵索引和單引號的services刪除59 ？

Answer 1

（數據->“服務”）-59

按索引刪除項目

例

 /* - 3 is the index to be deleted in a NUMERIC array 0 14 1 15 2 16 3 17 * to be deleted 4 18 */ select '[14, 15, 16, 17, 18]'::jsonb - 3 

\n |  ？柱？  |\n |  ：--------------- |\n |  [14、15、16、18] |\n

文本元素數組

 CREATE TABLE employees ( id serial primary key, data jsonb ); 

\n ✓\n

 insert into employees(data) values ('{"services": [50, 57, 59, 61], "locations": ["34"]}'::jsonb), ('{"services": [19, 21], "locations": ["34"]}'::jsonb) ; 

\n 2行受影響\n

 -- The link was used (https://dba.stackexchange.com/questions/54283/how-to-turn-json-array-into-postgres-array) select employees.id, jsonb_set(data, '{services}', ('[' || string_agg('"' || elem::text || '"' ,' ,') || ']')::jsonb - '59') from employees, json_array_elements((data->'services')::json) elem WHERE data @> '{"services":[59]}' group by employees.id ; 

\n id |  jsonb_set                                            \n -：|  ：------------------------------------------------- ---\n  1 |  {“服務”：[“ 50”，“ 57”，“ 61”]，“位置”：[“ 34”]}\n

db <> 在這里撥弄