I want to use mysql's "JOIN"
I want to group rows by "date_text" where "tokenIdx" is "1001" and "datetime_unix" is the highest value.
Is my code wrong?
SELECT `A.idx`
FROM `data_candle_h1` 'A'
JOIN
(
SELECT `date_text`, MAX(`datetime_unix`) AS 'datetime_unix'
FROM `data_candle_h1`
WHERE `tokenIdx` = '1002'
GROUP BY `date_text`
) 'B'
ON `A.datetime_unix` = `B.datetime_unix`
WHERE `A.tokenIdx` = '1002'
Your query is syntactically perfect. Just remove single quotes('') around table aliases (A and B). I have corrected it. Please check this out.
SELECT `A.idx`
FROM `data_candle_h1` A
JOIN
(
SELECT `date_text`, MAX(`datetime_unix`) AS 'datetime_unix'
FROM `data_candle_h1`
WHERE `tokenIdx` = '1002'
GROUP BY `date_text`
) B
ON `A.datetime_unix` = `B.datetime_unix`
WHERE `A.tokenIdx` = '1002'
Related
I fired this query where I join two tables and output some of the columns of both tables:
SELECT B.option_id, B.product_id, A.title, B.identifier
FROM `catalog_product_option_title` A JOIN
`catalog_product_option` B
ON A.option_id = B.option_id
WHERE A.title = "Breite"
Result:
Now I need to enter the example value xyz on the column identifier in the result, everywhere. I would go ahead and do this by hand.
How can I make use of the update statement from MySQL to solve this without having to manually change it by hand?
I tried it like this:
UPDATE `catalog_product_option`
SET identifier = 'xyz'
WHERE option_id IN (
SELECT A.option_id
FROM `catalog_product_option_title` A
JOIN
`catalog_product_option` B
ON A.option_id = B.option_id
WHERE A.title = "Breite"
)
But the simulation of this query returned that this would change 0 lines.
UPDATE
I called the sql without simulating it, and now I get this error:
1093 - Table 'catalog_product_option' is specified twice, both as a target for 'UPDATE' and as a separate source for data
You could rewrite your query as a JOIN:
UPDATE `catalog_product_option` B
JOIN `catalog_product_option_title` A ON A.option_id = B.option_id
SET B.identifier = 'xyz' WHERE A.title = "Breite"
Can you try like this please?
UPDATE `catalog_product_option`
SET identifier = 'xyz'
WHERE option_id IN (
SELECT option_id FROM (SELECT A.option_id
FROM `catalog_product_option_title` A
JOIN
`catalog_product_option` B
ON A.option_id = B.option_id
WHERE A.title = "Breite") as x
)
review table has store_idx, user_idx etc...
I want to create a query sentence that gets information about the store to which the user has bookmarked with the user_id value entered.
The query sentence I made is
select A.store_name
, A.store_img
, count(B.store_idx) as review_cnt
from board.store A
Left
Join board.review B
On A.store_idx is B.store_idx
where store_idx is (select A.store_idx from bookmark where user_id = ?)
However, nothing came out as a result.
Help me..
Please use below Query:
SELECT store_name
, store_img
, SUM(review_cnt) AS review_cnt
FROM
( SELECT DISTINCT A.store_name
, A.store_img
, CASE WHEN B.store_idx IS NULL THEN 0 ELSE 1 END AS review_cnt
FROM bookmark br
JOIN board.store A
ON A.store_idx = br.store_idx
LEFT
JOIN board.review B
ON A.store_idx = B.store_idx
WHERE br.user_id = ?
)T
The WHERE clause is obviously filtering out all rows. We can't do much about that. But your query is also lacking a GROUP BY, the table aliases can be improved, and the join condition is not correct.
So, try this version:
select s.store_name, s.store_img, count(b.store_idx) as review_cnt
from board.store s left join
board.review r
on s.store_idx = r.store_idx
where b.store_idx in (select b.store_idx
from bookmark b
where b.user_id = ?
);
I have the following code and I'm trying to group the messages
Here is a picture of database table and how the groups should be
and here is the SQL statement
SELECT a.* FROM `user_messages` `a`
JOIN (
SELECT `sender`, MAX(`id`) `last_id` FROM `user_messages` WHERE `receiver` = '1' GROUP BY `sender`
) `b`
ON `a`.`sender` = `b`.`sender` AND `a`.`id` = `b`.`last_id`
WHERE `a`.`receiver` = '1'
ORDER BY `id` DESC
OUTPUT:
I want to get somehow the last record where "receiver" is not my id, but "sender" is and name receiver column as "id" or something.
...so what i want is following result:
id | msg
13852 123
48 Hello!
17 321
Here is a fiddle: http://sqlfiddle.com/#!9/e06d57/3/0
To map my generic answer to your particular use case (using example 1):
SELECT receiver AS id, msg
FROM user_messages outerTable
WHERE NOT EXISTS
( SELECT *
FROM user_messages innerTable
WHERE innerTable.sender = outerTable.sender
AND innerTable.receiver = outerTable.receiver
AND innerTable.added > outerTable.added
)
AND sender = 1
This is a very common use case. There are several ways to write this code. Depending on the SQL engine used, they will be of different speeds.
I will use fairly generic column names. Tweak as needed.
SELECT common_id, msg
FROM myTable outerTable
WHERE NOT EXISTS
( SELECT *
FROM myTable innerTable
WHERE innerTable.common_id = outerTable.common_id
AND innerTable.time > outerTable.time
)
Please note that if there are two rows with identical common_id and time columns, then both will show up in the output. You can replace the > with >= to hide both of those rows.
The other common approach is kind of difficult to make sense of, but here goes. Notice the similarities to the NOT EXISTS approach.
SELECT outerTable.common_id, outerTable.msg
FROM myTable outerTable
LEFT JOIN myTable innerTable
ON innerTable.common_id = outerTable.common_id
AND innerTable.time > outerTable.time
WHERE innerTable.common_id IS NULL
According to your description, you seem to want something like this:
select um.receiver as id, um.msg
from user_messages um
where um.sender = 1 and
um.id = (select max(um2.id)
from user_messages um2
where um2.msg = um.msg and um2.receiver <> 1 and um.sender = 1
);
It doesn't produce the desired output, but that is because the output is inconsistent with the text description.
I am confused here This first sql-
I have one entry in my cnt_content table with content_pk=5419441 and title=test wls-2
Now when I am running this sql 1-
SELECT
title,
content_pk
FROM
cnt_content c
WHERE
c.type not in (
'AMT', 'LPA', 'QUE'
)
AND c.private_flag = 'N'
AND c.searchable_flag = 'Y'
AND c.status in (
'PUB', 'NAP'
)
AND (
trim(c.title) LIKE 'test wls-2'
OR trim(c.special_keyword) LIKE 'test wls-2'
)
and not exists (
SELECT
1
FROM
cmd_content_metadata cmd
WHERE
cmd.content_pk=5419441
AND cmd.for_others='Y'
)
ORDER BY
c.last_modified_date desc;
it is giving result-content_pk=5419441 and title=test wls-2
But when I am running this sql 2-
SELECT
title,
content_pk
FROM
cnt_content c
WHERE
c.type not in (
'AMT', 'LPA', 'QUE'
)
AND c.private_flag = 'N'
AND c.searchable_flag = 'Y'
AND c.status in (
'PUB', 'NAP'
)
AND (
trim(c.title) LIKE 'test wls-2'
OR trim(c.special_keyword) LIKE 'test wls-2'
)
and not exists (
SELECT
1
FROM
cmd_content_metadata cmd
WHERE
cmd.content_pk=c.content_pk
AND cmd.for_others='Y'
)
ORDER BY
c.last_modified_date desc;
It is not giving any result. Anyone please explain.
Because in one you just giving specific value for content_pk as 5419441, while other one uses corelated query which means for each and every value of content_pk selected in outer query, you are checking for equality in your sub select query.
I have this query which i want to get rank from the data on my database
set #urut:=0;
set #rankhrg:=0;
select #urut:=#urut+1 as urut, a.id_tender, b.nama_tender, b.nomor_tender, b.tgl_close1 as tgl_close,
(SELECT rankhrg
from (select sum(tot_harga) as hrg_twr, id_rekanan, id_tender, #rankhrg:=#rankhrg+1 as rankhrg from tb_real_barang where id_tender = s.id_tender group by id_rekanan) as rank_harga
left join tb_master_tender s on s.id_tender = b.id_tender
where rank_harga.id_rekanan = a.id_rekanan
order by rank_harga.hrg_twr asc) as ranking
from tb_real_tender a
left join tb_master_tender b on a.id_tender = b.id_tender
where a.id_rekanan = 1
order by convert(a.id_tender,unsigned) desc
i want to pass id_tender into the select inside the select when i want to get rankhrg :
select sum(tot_harga) as hrg_twr, id_rekanan, id_tender,
#rankhrg:=#rankhrg+1 as rankhrg
from tb_real_barang
where id_tender = s.id_tender
group by id_rekanan
but I always get error that said that s.id_tender is unknown in where clause.
can someone guide me how to pass the parameter into that insert?
thank you :)
You are not joining with that table tb_master_tender and neither it's present in outer query FROM clause. So, you need to do a JOIN separately for that inner query like below
select sum(trb.tot_harga) as hrg_twr,
trb.id_rekanan,
trb.id_tender,
#rankhrg:=#rankhrg+1 as rankhrg
from tb_real_barang trb
left join tb_master_tender s on trb.id_tender = s.id_tender
group by trb.id_rekanan