I am trying to update two columns within a table from a select statment in MySQL 5.7.
The error I get is "invalid use of group function"
Stmt:
UPDATE
catalog mpc
JOIN
reviews mpr ON mpr.merchant_id = mpc.MERCHANT_ID and mpr.sku = mpc.ARTICLE_ID
SET
mpc.RATING = avg(mpr.rating),
mpc.RATINGS = count(mpr.rating)
WHERE
mpr.MERCHANT_ID = 1
AND mpr.sku = '133';
It looks about right to me, what could be the problem here?
You must aggregate first in reviews and then join to catalog:
UPDATE catalog mpc
INNER JOIN (
SELECT merchant_id, sku, AVG(rating) avg_rating, COUNT(rating) count_rating
FROM reviews
WHERE merchant_id = 1 AND sku = '133'
GROUP BY merchant_id, sku
) mpr ON mpr.merchant_id = mpc.MERCHANT_ID and mpr.sku = mpc.ARTICLE_ID
SET mpc.RATING = mpr.avg_rating,
mpc.RATINGS = mpr.count_rating
Related
I am trying to convert following SQL into rails active record query
"SELECT * FROM stocks
INNER JOIN
(
SELECT product_id, MIN(ask_price) min_price
FROM stocks
GROUP BY product_id,size
) sub ON stocks.product_id = sub.product_id AND
stocks.ask_price = sub.min_price
where stocks.product_id = 1"
This query fetches the lowest price of the stock group by product and size of product.
So far I have tried to translate it like this it not right.
sub_query = Stock.select("product_id, MIN(ask_price) min_price").group(:product_id,:size)
stocks = Stock.joins("#{sub_query} stocks.product_id = sub.product_id AND
stocks.ask_price = sub.min_price")
You should pass into joins method all your join clause if you want to do some custom joining, like this:
stocks = Stock.joins(<<-SQL
INNER JOIN
(
SELECT product_id, MIN(ask_price) min_price
FROM stocks
GROUP BY product_id, size
) sub ON stocks.product_id = sub.product_id AND stocks.ask_price = sub.min_price
SQL).where(product_id: 1)
I am trying to insert data using a subquery. I am only going to post my SELECT statement below.
SELECT PlaylistCode
FROM Playlists
WHERE Name_Of_Playlist = 'X'
AND
(SELECT Code
FROM Songs
INNER JOIN Artists ON Artists.PageURL = Songs.PageURL
WHERE Artist = 'X'
LIMIT 200)
Error Code: 1242. Subquery returns more than 1 row 0.016 sec
Try to Below Query
SELECT PlaylistCode
FROM Playlists
WHERE exits
(SELECT Code
FROM Songs
INNER JOIN Artists ON Artists.PageURL = Songs.PageURL
WHERE Artist = 'X'
LIMIT 200) and Name_Of_Playlist = 'X'
Based on your requirements, you need to use select case then join corresponding tables
INSERT INTO Playlists (PlaylistCode)
SELECT CASE WHEN a.Artist = 'X' THEN 'X' ELSE s.Code END
FROM Songs s
INNER JOIN Artists a ON a.PageURL = s.PageURL
im trying to use max() here in my sql but im confused because i am using join table and i dont have idea where i should insert the max()
i need to add the column name date_issue from the table crew_documents_table
here is my sql:
select *
from
info join
crew_documents_table on info.id = crew_documents_table.document_crew_id join
crew_rank on info.crew_rank = crew_rank.crew_rank_id
where
crew_rank in ('1','2','3','4','5') and
crew_status = '$crew_status' and
vessel = '$vessel_name'
group by full_name
You can customize your SQL query as below :
select *, MAX(crew_documents_table.date_issue) as max_date
from
info join
crew_documents_table on info.id = crew_documents_table.document_crew_id join
crew_rank on info.crew_rank = crew_rank.crew_rank_id
where
crew_rank in ('1','2','3','4','5') and
crew_status = '$crew_status' and
vessel = '$vessel_name'
group by full_name
MAX allows you to select the maximum date
I would want to count entries in a column and display the count beside it.
However, I'm clueless on how can I do it.
Desired output:
arrangement_number tray_no rl_type flag(count of occurrence)
------------------ ------- ---- ----
2774818 381001 R 3
2774818 381001 R 3
2774818 381001 L 3
2778470 405128 R 1
2779702 265265 R 2
2779702 265265 R 2
I'm currently trying queries using #variables but I still cant get it right.
each row are unique and I need them not to be grouped.
Update: Expanded Table added source code
Note: I'm currently joining 5 tables now
Actual Query:
SELECT
log.arrangement_number,
header.tray_number,
detail.rl_type,
-- some more fields here
FROM
log
INNER JOIN
header ON log.arrangement_number = header.rxarrangement_number
AND log.production_place_code = header.production_place_code
INNER JOIN
detail ON log.arrangement_number = detail.rxarrangement_number
AND log.production_place_code = detail.production_place_code
INNER JOIN
deliveryperiod ON log.arrangement_number = deliveryperiod.arrangement_number
AND log.production_place_code = deliveryperiod.production_place_code
AND detail.rl_type = deliveryperiod.rl_type
INNER JOIN
calc ON calc.arrangement_number = log.arrangement_number
AND calc.production_place_code = log.production_place_code
AND deliveryperiod.rl_type = calc.rl_type
AND detail.rl_type = calc.rl_type
WHERE
header.status_code IN ('20' , '21')
AND log.process_code = '12'
AND deliveryperiod.process_code_current = '12'
AND deliveryperiod.sub_process_code_current IN ('100' , '105')
AND lot_number = '120131'
ORDER BY log.lot_number , log.sequence_number , deliveryperiod.rl_type DESC
SELECT t1.tray_no,
t2.flag
FROM yourTable
INNER JOIN
(
SELECT tray_no, COUNT(*) AS flag
FROM yourTable
GROUP BY tray_no
) t2
ON t1.tray_no = t2.tray_no
try this...
SELECT tray_no, COUNT(*) 'flag'
FROM table1
GROUP BY tray_no
I have a master table called "parent" and a related table called "childs"
Now I run a query against the master table to update some values with the sum from the child table like this.
UPDATE master m SET
quantity1 = (SELECT SUM(quantity1) FROM childs c WHERE c.master_id = m.id),
quantity2 = (SELECT SUM(quantity2) FROM childs c WHERE c.master_id = m.id),
count = (SELECT COUNT(*) FROM childs c WHERE c.master_id = m.id)
WHERE master_id = 666;
Which works as expected but is not a good style because I basically make multiple SELECT querys on the same result. Is there a way to optimize that? (Making a query first and storing the values is not an option.
I tried this:
UPDATE master m SET (quantity1, quantity2, count) = (
SELECT SUM(quantity1), SUM(quantity2), COUNT(*)
FROM childs c WHERE c.master_id = m.id
) WHERE master_id = 666;
but that doesn't work.
Update: Here is the solution, thanks to everbody:
You can do something like this:
UPDATE master m
INNER JOIN childs c ON m.master_id = c.master_id
SET master.quantity1 = c.quantity1,
master.count = 1
If you have only one child record at a time. However if you want to use a group function like SUM() in the joined table that doesn't work. Either you get a "Invalid use of group function" if you leave the "group by" part or a "You have an error in your sql syntax if you use "GROUP BY c.master_id"
-- This doesnt work :(
UPDATE master m
INNER JOIN childs c ON m.master_id = c.master_id
SET master.quantity1 = SUM(c.quantity1),
master.count = COUNT(c.*)
GROUP by c.master_id
The solution is to use JOIN with a subquery:
UPDATE master m
INNER JOIN
(
SELECT master_id,
SUM(quantity1) as quantity1,
COUNT(*) as count
FROM childs c
GROUP BY master_id
) c
ON c.master_id = m.master_id
SET m.quantity1 = c.quantity1,
m.count = c.count
WHERE m.master_id = 666;
But since this pulls every row from the childtable the overhead would likely be bigger than using more subqueries like in the original sql. So you should add a WHERE clause to the joined table to get only the rows you need.
Another interesting approach is this syntax, which does the same as the JOIN with the WHERE clause but you should only use if if you want to update all rows with the same values and your subquery only returns one row, since the result from the subquery gets appended to the result and can be used like any column.
UPDATE master m,
(
SELECT SUM(c.quantity1) as sum_of_quantity,
COUNT(*) as rowcount FROM child c WHERE c.master_id = 666
) as c
SET m.quantity1 = c.sum_of_quantity,
m.count = c.rowcount
WHERE m.master_id = 666;
Rewriting Lieven's solution to MySQL:
UPDATE master m
JOIN (
SELECT master_id
, SUM(quantity1) as quantity1
, SUM(quantity2) as quantity2
, COUNT(*) as count
FROM childs c
GROUP BY
master_id
) c
ON c.master_id = m.master_id
SET
m.quantity1 = c.quantity1
,m.quantity2 = c.quantity2
,m.count = c.count
WHERE m.master_id = 666;
I don't know if it is allowed in MySQL, but SQL Server allows you to use the result of a select in an update.
UPDATE master m SET
quantity1 = c.quantity1
, quantity2 = c.quantity2
, count = c.count
FROM master m
INNER JOIN (
SELECT master_id
, quantity1 = SUM(quantity1)
, quantity2 = SUM(quantity2)
, count = COUNT(*)
FROM childs c
WHERE master_id = 666
GROUP BY
master_id
) c ON c.master_id = m.master_id
You could select your data into a temporary table, and then update using that data.
If you also want to insert "new" data in the same roundtrip, look into INSERT INTO ... SELECT FROM ... ON DUPLICATE KEY UPDATE ...
If you already are doing inserts if row doesn't exist, then that would be redundant with this example.
example:
INSERT INTO master m (id, quantity1, quantity2, count)
SELECT master_id, SUM(quantity1) q1, SUM(quantity2) q1, COUNT(*) c
FROM childs
GROUP BY master_id
ON DUPLICATE KEY UPDATE
m.quantity1 = q1,
m.quantity2 = q2,
m.count = c
NOTE! This is untested code, but I think it should be possible to backreference the select result in the UPDATE.
Syntax reference: http://dev.mysql.com/doc/refman/5.0/en/insert.html