When I try to join 2 tables and use SUM or COUNT it all works perfectly and as expected. However when I join 3 tables SUM and COUNT makes no sense because the JOIN statements create extra rows for each table to have a unique row so they over count and over sum the required values.
Here is the query:
SELECT PO_club.clubid, PO_club.name, PO_club.pic, PO_club.points, count(PO_club_user.userid), SUM(PO_club_point_log.points)
FROM PO_club
INNER JOIN PO_club_user ON PO_club.clubid = PO_club_user.clubid
LEFT JOIN PO_club_point_log ON PO_club.clubid = PO_club_point_log.clubid
WHERE PO_club.deleted = 0
GROUP BY PO_club.clubid
ORDER BY PO_club.points DESC;
If I run two separate scripts like first join only PO_club and PO_club_user to get COUNT() it works. And then run PO_club JOIN PO_club_point_log to get SUM() its all good. However, I need to run it one script so that i would not need to sort it at the front end. Is there a way to join 3 tables and somehow COUNT() just work on PO_club and PO_club_users while SUM only on PO_club and PO_club_point_log?
Thanks!
How's this? This will include all PO_clubs even if they don't have any users in case they have points. If that's not what you want, change the first LEFT JOIN to INNER JOIN.
SELECT PO_club.clubid, PO_club.name, PO_club.pic, PO_club.points, count(PO_club_user.userid), t.sum_points
FROM PO_club
LEFT JOIN PO_club_user ON PO_club.clubid = PO_club_user.clubid
LEFT JOIN
(SELECT PO_club_point_log.clubid, SUM(PO_club_point_log.points) AS sum_points
FROM PO_club_point_log INNER JOIN PO_club ON PO_club_point_log.clubid = PO_club.clubid
GROUP BY PO_club_point_log.clubid) AS t
ON PO_club.clubid = t.clubid
WHERE PO_club.deleted = 0
GROUP BY PO_club.clubid
ORDER BY PO_club.points DESC
Related
I am having an issue with my multi join SQL statement, where I need to get the last entries of the table and not the first. I have 3 tables that I try to query based on this statement:
SELECT DISTINCT i.id,i.hz,i.v,i.t,i.u,i.temp, i.c1, s.server, s.hostname, h.codes,s.cpus FROM `dc_servers` AS s INNER JOIN `dc_hardware` AS h ON s.server = h.server INNER JOIN `dc_systemusage` AS i ON s.server = i.server GROUP BY i.server
The tables dc_servers & dc_hardware only has 1 row per server, however the table dc_systemusage has many rows with the same server, as new info is being added.
When I run the query, I get the first entries from the dc_systemusage, but I need to get the latest entries from that table, for me it sounds like I need an ORDER BY, however if I add that to the end of the query like this:
SELECT DISTINCT i.id,i.hz,i.v,i.t,i.u,i.temp, i.c1, s.server, s.hostname, h.codes,s.cpus FROM `dc_servers` AS s INNER JOIN `dc_hardware` AS h ON s.server = h.server INNER JOIN `dc_systemusage` AS i ON s.server = i.server GROUP BY i.server ORDER BY i.id DESC
then I am just ordering the result, which is not what I am looking for.
I hope someone can guide me in the right direction as for how I can get the latest rows and not the first from the table dc_systemusage
I hope I have provided the needed information to guide me, else please do let me know and I will add whatever is neeeded.
Thank you all.
You can find dc_systemusage lastest ids in subquery and use with WHERE ... IN
SELECT i.id,i.hz,i.v,i.t,i.u,i.temp, i.c1, s.server, s.hostname, h.codes,s.cpus
FROM `dc_servers` AS s
INNER JOIN `dc_hardware` AS h ON s.server = h.server
INNER JOIN `dc_systemusage` AS i ON s.server = i.server
WHERE i.id IN (SELECT max(dc_systemusage.id) FROM dc_systemusage GROUP BY dc_systemusage.server)
and check a great answer at https://stackoverflow.com/a/3800572/7174186
Without going into the details of the tables, here is a query that outputs 34 rows.
SELECT `t`.`id_product`,
`product_lang`.`name`,
supplies_detail.id_supplies_detail,
`supplies_in_process`.id_supply
FROM `ps_product` `t`
LEFT OUTER JOIN `ps_product_lang` `product_lang` ON (`product_lang`.`id_product` = `t`.`id_product`)
LEFT OUTER JOIN `supplies_detail` `supplies_detail` ON (`supplies_detail`.`id_product` = `t`.`id_product`)
LEFT OUTER JOIN `supplies` `supplies_in_process`
ON (`supplies_detail`.`id_supply` = `supplies_in_process`.`id_supply`) AND
(supplies_in_process.state = 'added')
WHERE ((product_lang.name NOT LIKE '[del]%') AND (t.group_id = '14884'))
ORDER BY t.id_product DESC;
Query without GROUP BY
But it is important for the processor to understand that there will be no rows with duplicate t.id_product in the result, so we add GROUP BY t.id_product to this query.
The result changes to:
Query with GROUP BY
With exactly the same 34 rows we get additional unrelated data. How did it happen?
Thanks
MySQL 8.0.25-15
I have the rather lengthy SQL query that I have included below. As you can see it orders by AvgRating and NumReviews, both of which rely on data from the reviews table. Unfortunately I need to see the rows in my results even when there are no reviews, currently if there are no reviews to order by then that row just doesnt show up in the results. All help greatly appreciated.
SELECT travisor_tradesperson.name, travisor_tradesperson.id, travisor_catagory.catname,
travisor_company.cname, travisor_company.description, travisor_company.city, travisor_company.address, travisor_company.postcode, travisor_company.phone,
ROUND(AVG(travisor_review.rating)) as RoundAvgRating, AVG(travisor_review.rating) as AvgRating, COUNT(travisor_review.rating) as NumReviews
FROM `travisor_tradesperson`
INNER JOIN travisor_company
ON travisor_tradesperson.company = travisor_company.id
INNER JOIN travisor_catagory
ON travisor_tradesperson.catagory = travisor_catagory.id
INNER JOIN travisor_review
ON travisor_review.tradesperson = travisor_tradesperson.id
WHERE travisor_catagory.catname = '$catagory'
AND travisor_company.city = '$city'
GROUP BY travisor_tradesperson.name, travisor_catagory.catname, travisor_company.cname,
travisor_company.description
ORDER BY AvgRating DESC, NumReviews DESC
Left join travisor_review instead of Inner Join. Inner join will only find records that are present in both tables. If you have no reviews for that tradesperson record, it will drop from the results set.
Left join will return a NULL if it cannot match on the join predicate. In this case, the tradesperson will return but with a NULL. Convert the NULL to a 0 if needed and that should fix your AVG.
I am trying to perform the following query:
SELECT wwpqsr.statistic_ref_id,
wwpqsr.create_time,
wwpqm.name
FROM wp_wp_pro_quiz_statistic_ref AS wwpqsr
INNER JOIN wp_wp_pro_quiz_statistic AS wwpqs
ON ( wwpqs.statistic_ref_id = wwpqsr.statistic_ref_id
AND COUNT(wwpqs.correct_count) AS correct =
COUNT(wwpqs.incorrect_count) AS incorrect)
INNER JOIN wp_wp_pro_quiz_master AS wwpqm
ON (wwpqm.id = wwpqsr.quiz_id)
WHERE wwpqsr.user_id = 1;
I need to do a limit on the result here at the end, that is not being shown right now for functionality purposes, since I need to only get results returned from the p_wp_pro_quiz_statistic table where the count of correct_count equals the count of rows from the incorrect_count column. How can I do this within an INNER JOIN here? All within 1 query? Possible? The above code returns empty result, where it should not be an empty result. How should something like this be done?
As I said in comments, you can't use aggregate functions as a where clause unless it is a field from a subquery. For your case I think you are looking for:
SELECT wwpqsr.statistic_ref_id,
wwpqsr.create_time,
wwpqm.name
FROM wp_wp_pro_quiz_statistic_ref AS wwpqsr
INNER JOIN wp_wp_pro_quiz_statistic AS wwpqs
ON ( wwpqs.statistic_ref_id = wwpqsr.statistic_ref_id )
INNER JOIN wp_wp_pro_quiz_master AS wwpqm
ON (wwpqm.id = wwpqsr.quiz_id)
WHERE wwpqsr.user_id = 1
GROUP
BY wwpqsr.statistic_ref_id,
wwpqsr.create_time,
wwpqm.name
HAVING COUNT(wwpqs.correct_count) = COUNT(wwpqs.incorrect_count);
I have a function that gets a SQL code and inserts a count field in it and executes the query to return the number of rows in it. The objective is to have a dynamic SQL code and be able to get its record count no matter what code it has, because I use it in a registry filter window and I never know what code may be generated, because the user can add as many filters as he/she wants.
But as I use the group by clause, the result is wrong because it is counting the number of times a main registry appears because of the use on many join connections.
The result of that code above should only one row with a columns with 10 as result, but I get a new table with the first columns with a 2 in the first row and a 1 on the other rows.
If I take off the group by clause I will receive a 11 as a count result, but the first row will be counted twice.
What should I do to get a single row and the correct number?
SELECT
COUNT(*) QUERYRECORDCOUNT, // this line appears only in the Count() function
ARTISTA.*,
CATEGORIA.NOME AS CATEGORIA,
ATIVIDADE.NOME AS ATIVIDADE,
LOCALIDADE.NOME AS CIDADE,
MATRICULA.NUMERO AS MAP
FROM
ARTISTA
LEFT JOIN PERFIL ON PERFIL.REGISTRO = ARTISTA.ARTISTA_ID
LEFT JOIN CATEGORIA ON CATEGORIA.CATEGORIA_ID = PERFIL.CATEGORIA
LEFT JOIN ATIVIDADE ON ATIVIDADE.ATIVIDADE_ID = PERFIL.ATIVIDADE
LEFT JOIN LOCALIDADE ON LOCALIDADE.LOCALIDADE_ID = ARTISTA.LOCAL_ATIV_CIDADE
LEFT JOIN MATRICULA ON MATRICULA.REGISTRO = ARTISTA.ARTISTA_ID
WHERE
((ARTISTA.SIT_PERFIL <> 'NORMAL') AND (ARTISTA.SIT_PERFIL <> 'PRIVADO'))
GROUP BY
ARTISTA.ARTISTA_ID
ORDER BY
ARTISTA.ARTISTA_ID;
This always gives you the number of rows for any query you have:
Select count(*) as rowcount from
(
Paste your query here
) as countquery
Since your are GROUPING BY ARTISTA.ARTISTA_ID, COUNT(*) QUERYRECORDCOUNT will return records count for each ARTISTA.ARTISTA_ID value.
If you want GLOBAL count, then you need to use a nested query:
SELECT COUNT(*) AS QUERYRECORDCOUNT
FROM (SELECT
ARTISTA.*,
CATEGORIA.NOME AS CATEGORIA,
ATIVIDADE.NOME AS ATIVIDADE,
LOCALIDADE.NOME AS CIDADE,
MATRICULA.NUMERO AS MAP
FROM
ARTISTA
LEFT JOIN PERFIL ON PERFIL.REGISTRO = ARTISTA.ARTISTA_ID
LEFT JOIN CATEGORIA ON CATEGORIA.CATEGORIA_ID = PERFIL.CATEGORIA
LEFT JOIN ATIVIDADE ON ATIVIDADE.ATIVIDADE_ID = PERFIL.ATIVIDADE
LEFT JOIN LOCALIDADE ON LOCALIDADE.LOCALIDADE_ID = ARTISTA.LOCAL_ATIV_CIDADE
LEFT JOIN MATRICULA ON MATRICULA.REGISTRO = ARTISTA.ARTISTA_ID
WHERE
((ARTISTA.SIT_PERFIL <> 'NORMAL') AND (ARTISTA.SIT_PERFIL <> 'PRIVADO'))
GROUP BY
ARTISTA.ARTISTA_ID
ORDER BY
ARTISTA.ARTISTA_ID);
In this case, you may not need to select those many columns.
If you need to retrieve the all records count with details, then better to use two separate queries.