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Is it possible to use two "select" in the same query?
I tried it but got the syntax error several times.
My query example:
SELECT
comp.id,
comp.document,
comp.dateStart,
comp.companyName,
comp.fantasyName,
comp.legalNature,
comp.mainActivity,
comp.situation,
comp.shareCapital,
comp.idCompanyStatus,
pp.userCredentialId,
uc.name,
cs.name AS 'nameStatus',
cs.color AS 'colorStatus',
cs.description,
comp.idPurchasedProduct,
comp.actived,
comp.createAt,
comp.updateAt,
comp.phone
FROM `PurchasedProduct` pp
INNER JOIN
`Company` comp on comp.idPurchasedProduct = pp.id
INNER JOIN
`UserCustomer` uc on pp.userCredentialId = uc.credentialId
INNER JOIN
`CompanyStatus` cs on cs.id = comp.idCompanyStatus
WHERE
comp.actived = 1
LIMIT 0,5;
SELECT COUNT(id) AS totalItems, CEILING(COUNT(id) / 10) AS totalPages FROM Company;
I would like the result shown to be all queries on the screen.
Basically, what I want is that the result shown when executing the query is the first and second "select" together.
I really don't know how or don't understand how to do this.
Example:
first result with seconde result
I want to show both results at once.
The documents is fake, not real. Only for demo.
You should be able to do by having the second query as its own JOIN query. Since there is no group by, it is only returning a single row. By no join condition, the value will be available for every row otherwise. So you SHOULD be able to get by doing
select
[ all your other columns ],
JustCounts.TotalItems,
JustCounts.TotalPages
from
[PurchasedProduct and all your other joins]
JOIN ( SELECT
COUNT(id) AS totalItems,
CEILING(COUNT(id) / 10) AS totalPages
FROM Company ) as JustCounts
where
[rest of your original query]
I have been recently messing with MySQL as I'm using it in a current project, I have a few thousand records in a table but there's one which stands out to me, I have a SELECT statement which collects a bunch of column names and uses them for the final query to send.
However when I run the query, it gives me duplicates as seen here:
https://i.imgur.com/PImNBam.png
The strange thing is that the ID is set as the key, so there's no right for MySQL to produce duplicates, and even if I go into the table and check manually, no duplicates exist.
This query used to work without a hitch on this exact server, I tried to group the scores by id and by song_name (from the photo) but it has given no results, I tried to delete duplicates using:
DELETE t1
FROM scores t1
INNER JOIN scores t2
WHERE t1.score < t2.score
AND t1.beatmap_md5 = t2.beatmap_md5
AND t1.userid = t2.userid;
But that returned zero queries and didn't change anything at all.
SQL query that I use to gather the information:
SELECT scores.id,
beatmaps.song_name,
scores.beatmap_md5,
users.username,
scores.userid,
scores.time,
scores.score,
scores.pp,
scores.play_mode,
scores.mods
FROM scores
LEFT JOIN beatmaps ON beatmaps.beatmap_md5 = scores.beatmap_md5
LEFT JOIN users ON users.id = scores.userid
WHERE users.privileges & 1 > 0
I really expected no duplicates to show as none of those exist, I don't know if mysql is having some caching issue or if this could be something else.
For avoid duplicated rows you could use distinct
SELECT DISTINCT
scores.id
, beatmaps.song_name
, scores.beatmap_md5
, users.username
, scores.userid
, scores.time
, scores.score
, scores.pp
, scores.play_mode
, scores.mods
FROM scores
LEFT JOIN beatmaps ON beatmaps.beatmap_md5 = scores.beatmap_md5
LEFT JOIN users ON users.id = scores.userid
WHERE users.privileges & 1 > 0
Take the following:
SELECT
Count(a.record_id) AS newrecruits
,a.studyrecord_id
FROM
visits AS a
INNER JOIN
(
SELECT
record_id
, MAX(modtime) AS latest
FROM
visits
GROUP BY
record_id
) AS b
ON (a.record_id = b.record_id) AND (a.modtime = b.latest)
WHERE (((a.visit_type_id)=1))
GROUP BY a.studyrecord_id;
I want to amend the COUNT part to display a zero if there are no records since I assume COUNT will evaluate to Null.
I have tried the following but still get no results:
IIF(ISNULL(COUNT(a.record_id)),0,COUNT(a.record_id)) AS newrecruits
Is this an issue because the join is on record_id? I tried changing the INNER to LEFT but also received no results.
Q
How do I get the above to evaluate to zero if there are no records matching the criteria?
Edit:
To give a little detail to the reasoning.
The studies table contains a field called 'original_recruits' based on activity before use of the database.
The visits tables tracks new_recruits (Count of records for each study).
I combine these in another query (original_recruits + new_recruits)- If there have been no new recruits I still need to display the original_recruits so if there are no records I need it to evalulate to zero instead of null so the final sum still works.
It seems like you want to count records by StudyRecords.
If you need a count of zero when you have no records, you need to join to a table named StudyRecords.
Did you have one? Else this is a nonsense to ask for rows when you don't have rows!
Let's suppose the StudyRecords exists, then the query should look like something like this :
SELECT
Count(a.record_id) AS newrecruits -- a.record_id will be null if there is zero count for a studyrecord, else will contain the id
sr.Id
FROM
visits AS a
INNER JOIN
(
SELECT
record_id
, MAX(modtime) AS latest
FROM
visits
GROUP BY
record_id
) AS b
ON (a.record_id = b.record_id) AND (a.modtime = b.latest)
LEFT OUTER JOIN studyrecord sr
ON sr.Id = a.studyrecord_id
WHERE a.visit_type_id = 1
GROUP BY sr.Id
I solved the problem by amending the final query where I display the result of combining the original and new recruits to include the IIF there.
SELECT
a.*
, IIF(IsNull([totalrecruits]),consents,totalrecruits)/a.target AS prog
, IIf(IsNull([totalrecruits]),consents,totalrecruits) AS trecruits
FROM
q_latest_studies AS a
LEFT JOIN q_totalrecruitment AS b
ON a.studyrecord_id=b.studyrecord_id
;
While working on a system I'm creating, I attempted to use the following query in my project:
SELECT
topics.id,
topics.name,
topics.post_count,
topics.view_count,
COUNT( posts.solved_post ) AS solved_post,
(SELECT users.username AS posted_by,
users.id AS posted_by_id
FROM users
WHERE users.id = posts.posted_by)
FROM topics
LEFT OUTER JOIN posts ON posts.topic_id = topics.id
WHERE topics.cat_id = :cat
GROUP BY topics.id
":cat" is bound by my PHP code as I'm using PDO. 2 is a valid value for ":cat".
That query though gives me an error: "#1241 - Operand should contain 1 column(s)"
What stumps me is that I would think that this query would work no problem. Selecting columns, then selecting two more from another table, and continuing on from there. I just can't figure out what the problem is.
Is there a simple fix to this, or another way to write my query?
Your subquery is selecting two columns, while you are using it to project one column (as part of the outer SELECT clause). You can only select one column from such a query in this context.
Consider joining to the users table instead; this will give you more flexibility when selecting what columns you want from users.
SELECT
topics.id,
topics.name,
topics.post_count,
topics.view_count,
COUNT( posts.solved_post ) AS solved_post,
users.username AS posted_by,
users.id AS posted_by_id
FROM topics
LEFT OUTER JOIN posts ON posts.topic_id = topics.id
LEFT OUTER JOIN users ON users.id = posts.posted_by
WHERE topics.cat_id = :cat
GROUP BY topics.id
In my case, the problem was that I sorrounded my columns selection with parenthesis by mistake:
SELECT (p.column1, p.column2, p.column3) FROM table1 p WHERE p.column1 = 1;
And has to be:
SELECT p.column1, p.column2, p.column3 FROM table1 p WHERE p.column1 = 1;
Sounds silly, but it was causing this error and it took some time to figure it out.
This error can also occur if you accidentally use commas instead of AND in the ON clause of a JOIN:
JOIN joined_table ON (joined_table.column = table.column, joined_table.column2 = table.column2)
^
should be AND, not a comma
This error can also occur if you accidentally use = instead of IN in the WHERE clause:
FOR EXAMPLE:
WHERE product_id = (1,2,3);
COUNT( posts.solved_post ) AS solved_post,
(SELECT users.username AS posted_by,
users.id AS posted_by_id
FROM users
WHERE users.id = posts.posted_by)
Well, you can’t get multiple columns from one subquery like that. Luckily, the second column is already posts.posted_by! So:
SELECT
topics.id,
topics.name,
topics.post_count,
topics.view_count,
posts.posted_by
COUNT( posts.solved_post ) AS solved_post,
(SELECT users.username AS posted_by_username
FROM users
WHERE users.id = posts.posted_by)
...
I got this error while executing a MySQL script in an Intellij console, because of adding brackets in the wrong place:
WRONG:
SELECT user.id
FROM user
WHERE id IN (:ids); # Do not put brackets around list argument
RIGHT:
SELECT user.id
FROM user
WHERE id IN :ids; # No brackets is correct
This error can also occur if you accidentally miss if function name.
for example:
set v_filter_value = 100;
select
f_id,
f_sale_value
from
t_seller
where
f_id = 5
and (v_filter_value <> 0, f_sale_value = v_filter_value, true);
Got this problem when I missed putting if in the if function!
Another place this error can happen in is assigning a value that has a comma outside of a string. For example:
SET totalvalue = (IFNULL(i.subtotal,0) + IFNULL(i.tax,0),0)
(SELECT users.username AS posted_by,
users.id AS posted_by_id
FROM users
WHERE users.id = posts.posted_by)
Here you using sub-query but this sub-query must return only one column.
Separate it otherwise it will shows error.
I also have the same issue in making a company database.
this is the code
SELECT FNAME,DNO FROM EMP
WHERE SALARY IN (SELECT MAX(SALARY), DNO
FROM EMP GROUP BY DNO);
I have a query like this:
SELECT product.id,
GROUP_CONCAT(image.id) AS images_id,
GROUP_CONCAT(image.title) AS images_title,
GROUP_CONCAT(facet.id) AS facets_id
...
GROUP BY product.id
And the query works, but not as expected, because if I have a product with 5 facets and 1 image (suppose an image with id=7), then I get something like this in "images_id":
"7,7,7,7,7"
If I have 2 images (7 and 3) then I get something like:
"7,7,7,7,7,3,3,3,3,3"
and in facets I get something like:
"8,7,6,5,4,8,7,6,5,4"
I think MySQL is making some type of union of the differents rows returned by the query, and then concatenating everything.
My expected result is (for the last example):
images_id = "7,3"
facets_id = "8,7,6,5,4"
I can obtain that using DISTINCT in the GROUP_CONCAT, but then I have another problem:
If I have two images with the same title, one of them is ommited, and then I get something like:
images_id = "7,3,5"
images_title = "Title7and3,Title5"
So I miss the relation between images_id and images_title.
Does somebody know if it's possible to make this query in MySQL?
Maybe I'm complicating everything without any real benefits.
I'm trying to execute only one query because performance, but now I'm not so sure if it's even faster to execute two queries (one for selecting the facets and another for the images for example).
Please explain what do you think is the best solution for this and why.
Thanks !
Just add DISTINCT.
Example:
GROUP_CONCAT(DISTINCT image.id) AS images_id
You'll need to get each group separately:
SELECT
p.id,
images_id,
images_title,
facets_id,
...
FROM PRODUCT p
JOIN (SELECT product.id, GROUP_CONCAT(image.id) AS images_id
FROM PRODUCT GROUP BY product.id) a on a.id = p.id
JOIN (SELECT product.id, GROUP_CONCAT(image.title) AS images_title
FROM PRODUCT GROUP BY product.id) b on b.id = p.id
JOIN (SELECT product.id, GROUP_CONCAT(facet.id) AS facets_id
FROM PRODUCT GROUP BY product.id) b on c.id = p.id
...
You can add just the DISTINCT keyword, you'll get your desire results.
SELECT tb_mod.*, tb_van.*,
GROUP_CONCAT(DISTINCT tb_voil.vt_id) AS voil,
GROUP_CONCAT(DISTINCT tb_other.oa_id) AS other,
GROUP_CONCAT(DISTINCT tb_ref.rp_id) AS referral
FROM cp_modules_record_tbl tb_mod
LEFT JOIN cp_vane_police_tbl tb_van ON tb_van.mr_id= tb_mod.id
LEFT JOIN cp_mod_voilt_tbl tb_voil ON tb_voil.mr_id= tb_mod.id
LEFT JOIN cp_mod_otheraction_tbl tb_other ON tb_other.mr_id= tb_mod.id
LEFT JOIN cp_mod_referral_tbl tb_ref ON tb_ref.mr_id= tb_mod.id
WHERE tb_mod.mod_type = 2 GROUP BY tb_mod.id
If the issue is speed, then it may be a lot faster to simply select all the data you need as separate rows, and do the grouping in the application, i.e.:
SELECT product.id, image.id, image.title, facet.id
Then in the application:
foreach row:
push product_id onto list_of_product_ids
push image_id onto list_of_image_ids
etc.