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db<>fiddle
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Developer-C 11.1
3.0
4.0
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3.39
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create table test (somedata varchar(10), client_id int);
insert into test (somedata, client_id) VALUES ('abc', 1), ('sdfs', 2),('fdfgdf', 1),('sdffgd', 4), ('ggw3', 1),('a3r2', 2)
6 rows affected
SELECT client_id, COUNT(client_id) num_of_items FROM test GROUP BY client_id
client_id
num_of_items
1
3
2
2
4
1