我有一个包含项和标记的表。如何提出一个要求，将显示标签和相同的标签数量我的项目。

CREATE TABLE items_tags_sets (
uit_set_id varchar PRIMARY KEY,
item_id varchar,
tag varchar
);

insert into items_tags_sets values('uid1', 'it1', 'tag_test1');
insert into items_tags_sets values('uid2', 'it2', 'tag_test1');
insert into items_tags_sets values('uid3', 'it3', 'tag_test2');
insert into items_tags_sets values('uid4', 'it4', 'tag_test2');
insert into items_tags_sets values('uid5', 'it1', 'tag_test3');
insert into items_tags_sets values('uid6', 'it2', 'tag_test3');
insert into items_tags_sets values('uid7', 'it3', 'tag_test4');
insert into items_tags_sets values('uid8', 'it4', 'tag_test4');
insert into items_tags_sets values('uid9', 'it1', 'tag_test5');
insert into items_tags_sets values('uid10', 'it2', 'tag_test5');
insert into items_tags_sets values('uid11', 'it1', 'tag_test1');
insert into items_tags_sets values('uid12', 'it1', 'tag_test1');
insert into items_tags_sets values('uid13', 'it1', 'tag_test3');
----------------------------------
-- 28062020
select
    items_tags_sets.uit_set_id,
    items_tags_sets.item_id,
    items_tags_sets.tag,
  count(distinct items_tags_sets.tag) as tags_count

from items_tags_sets
where 
items_tags_sets.item_id = 'it1'
group by items_tags_sets.uit_set_id, items_tags_sets.tag;

我需要这样的结果：

-----------------------
| it1 | tag_test1 | 3 |
| it1 | tag_test3 | 2 |
| it1 | tag_test5 | 1 |
-----------------------

链接到代码：https://rextester.com/ctmoq42435