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Results tagged with postgresql
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user 71701
All versions of PostgreSQL. Add an additional version-specific tag like [postgresql-13] if that context is relevant.
0
votes
1
answer
137
views
Select records and related entity count
Given the following select that will count related entities for every record
SELECT MAIN.*, SUB.app_count
FROM my_table_view MAIN
LEFT JOIN (SELECT MAIN2.p_key,
count(DISTI …
- 303
1
vote
1
answer
2k
views
Avoiding duplicates when joining multiple tables
Schema
create table computer (computer_id bigserial primary key, computer_name varchar);
create table computer_hdd (computer_hdd_id bigserial,
computer_id bigint references computer(com …
- 303
12
votes
3
answers
33k
views
How to unnest and GROUP BY elements of a JSON array?
Given the band table, with a json column holding an array :
id | people
---+-------------
1 | ['John', 'Thomas']
2 | ['John', 'James']
3 | ['James', 'George']
How to list the number of bands eac …
- 303
7
votes
How to unnest and GROUP BY elements of a JSON array?
Based on @ypercubeᵀᴹ comment I ended up with :
SELECT name, count(*) as c
FROM band
CROSS JOIN LATERAL jsonb_array_elements(people::jsonb) as name
GROUP BY name;
Just used jsonb_array_elements ins …
- 303