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Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language

WITH posts_with_total_2_tags AS
(
SELECT TOP 1000 PostId, COUNT(TagId) as tag_count
FROM PostTags
GROUP BY PostId
HAVING COUNT(TagId) = 2
),
posts_with_total_2_tags_separated AS
(
SELECT 
PostId,
MIN(TagId) OVER (PARTITION BY PostId) as tag_min_id,
MAX(TagId) OVER (PARTITION BY PostId) as tag_max_id
FROM PostTags
WHERE PostId IN (SELECT PostId FROM posts_with_total_2_tags)
),
posts_with_total_2_tags_separated_names_added AS
(
SELECT 
PostId, 
tag_min_id, 
tag_max_id, 
t1.TagName as tag_min_name,
t2.TagName as tag_max_name
FROM posts_with_total_2_tags_separated
LEFT JOIN Tags t1
ON t1.Id = tag_min_id
LEFT JOIN Tags t2
ON t2.Id = tag_min_id
),
posts_with_total_2_tags_separated_grouped AS
(
SELECT 
PostId, 
CAST(tag_min_id AS VARCHAR) + '-' + CAST(tag_max_id AS VARCHAR) as min_max_tag
FROM posts_with_total_2_tags_separated_names_added
GROUP BY PostId, CAST(tag_min_id AS VARCHAR) + '-' + CAST(tag_max_id AS VARCHAR)
)
SELECT * FROM posts_with_total_2_tags_separated_names_added

view current version

edited dec 6

created dec 6 user28646684