Created
July 14, 2018 11:38
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Usage of case statement to flag user_type and sort datasets
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SELECT | |
* | |
FROM | |
( | |
SELECT | |
USER.id AS fetched_id, | |
USER.country_code, | |
USER.mobile, | |
USER.email, | |
user_profile.name, | |
CASE WHEN( | |
SELECT | |
COUNT(*) | |
FROM | |
user_contact | |
WHERE | |
user_contact.user_id = 2 AND user_contact.follower_id = fetched_id | |
) > 0 THEN "follower" WHEN( | |
SELECT | |
COUNT(*) | |
FROM | |
user_contact | |
WHERE | |
user_contact.user_id = fetched_id AND user_contact.follower_id = 2 | |
) > 0 THEN "following" ELSE "unrelated" | |
END AS user_type | |
FROM | |
USER | |
JOIN user_profile ON user_profile.user_id = USER.id | |
WHERE | |
USER.id IN( | |
SELECT | |
follower_id AS id | |
FROM | |
user_contact AS uc | |
WHERE | |
uc.user_id = 2 AND uc.is_friend = 1 | |
UNION | |
SELECT | |
user_id AS id | |
FROM | |
user_contact AS uc | |
WHERE | |
uc.follower_id = 2 AND uc.is_friend = 1 | |
) | |
UNION | |
SELECT | |
USER.id AS fetched_id, | |
USER.country_code, | |
USER.mobile, | |
USER.email, | |
user_profile.name, | |
CASE WHEN( | |
SELECT | |
COUNT(*) | |
FROM | |
user_contact | |
WHERE | |
user_contact.user_id = 2 AND user_contact.follower_id = fetched_id | |
) > 0 THEN "follower" WHEN( | |
SELECT | |
COUNT(*) | |
FROM | |
user_contact | |
WHERE | |
user_contact.user_id = fetched_id AND user_contact.follower_id = 2 | |
) > 0 THEN "following" ELSE "unrelated" | |
END AS user_type | |
FROM | |
USER | |
JOIN user_profile ON user_profile.user_id = USER.id | |
WHERE | |
USER.id NOT IN( | |
SELECT | |
follower_id AS id | |
FROM | |
user_contact AS uc | |
WHERE | |
uc.user_id = 2 AND uc.is_friend = 1 | |
UNION | |
SELECT | |
user_id AS id | |
FROM | |
user_contact AS uc | |
WHERE | |
uc.follower_id = 2 AND uc.is_friend = 1 | |
) | |
) AS usr | |
ORDER BY FIELD(user_type, "follower", "following", "unrelated") |
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