Sorry I don't know how to describe the topic.
i have a database where i store the unixtime of the entries and some other stuff, in this case the column "name" for the user and "type" it can be 1 or 2.
I want to check if there are entries where name is the same and type switches from 1 to 2 and back to 1 or 2 1 2 within 5 seconds.
So it shows me something like this:
Unixtime Name type
1550293559 Peter 2
1550293560 Peter 1
1550293561 Peter 2
Is there a query that can help me do this?
Sorry I really hope you guys understand that, I don't know how to explain the problem properly.
Thanks.
You can do that with a 3x self join on that table and the necessary conditions (All 3 rows have the same name etc.). See http://www.mysqltutorial.org/mysql-self-join/ for more info.
Note that as the join produces all the possible permutations as input material, you don't have to 'permute' the conditions in the where part of the query. E.g. To get the 5 second rule, you can just say
... where e1.unixtime > e2.unixtime and e2.unixtime > e3.unixtime and e3.unixtime+6 > e1.unixtime ...
Edit: since the original answer was downwoted, here is the full query (grumble grumble) assuming the table name 'sotest':
SELECT
*
FROM
sotest e1
JOIN
sotest e2
JOIN
sotest e3
WHERE
(e1.name = e2.name AND e2.name = e3.name
AND e1.unixtime > e2.unixtime
AND e2.unixtime > e3.unixtime
AND e3.unixtime + 6 > e1.unixtime)
AND ((e1.type = 1 AND e2.type = 2
AND e3.type = 1)
OR (e1.type = 2 AND e2.type = 1
AND e3.type = 2))
Related
I need to do something like this:
id tag status user trial Value (other columns)...
1 A Pass peter first 0
2 A Pass peter second 1
3 A Fail peter third 3
4 B Pass peter first 4
5 B Pass peter second 5
6 B Pass peter third 6
select the rows that tag equal A and status equal to Pass and find the same value for other tag ex:B
id tag status user trial Value_tag_A Value_tag_B (other columns)...
1 A Pass peter first O 4
2 A Pass peter second 1 5
I can do some processing using php to get this result, but i'm wondering if i can do it directly using sql
I've tried numerous variations and can't seem to get close to the result.
Solution: http://sqlfiddle.com/#!9/e9068d/17
I don't know why in the rows where tag=A also have Value_tag_B. I will ignore this and maybe the following query is an approach.
SELECT DISTINCT y.status, y.`user`, y.trial,
(SELECT Value FROM toto WHERE y.`user` = `user` and y.trial = trial and tag = 'A' ) AS Value_tag_A,
(SELECT Value FROM toto WHERE y.`user` = `user` and y.trial = trial and tag = 'B' ) AS Value_tag_B
FROM toto y
WHERE y.trial NOT IN (SELECT DISTINCT trial FROM toto WHERE `status` <> 'Pass')
The code has been modified.
SQL Fiddle
I have a MySQL table that looks like this:
ID / x_id / x_key / x_value
322 / 4 / name / Jack
323 / 5 / name / Mary
324 / 6 / name / John
325 / 4 / hide / 1
326 / 5 / hide / 0
327 / 6 / hide / 0
I would like to select the names from the persons which "hide" key corresponds to the "0" value.
Here these selected "x_values" would then be Mary and John
To do so, I have the x_id that I can compare between records.
Which x_id's correspond to an x_ key="hide" that matches an x_value = "0"?
Both x_id's 5 and 6.
Which "x_values" are corresponding to these two x_id's where the x_key="name"? Mary and John
In other words, I try to get a single query that would mix these two queries in order to get Mary and John only:
Query A:
SELECT
x_id,
x_value
FROM
mytable
WHERE
x_key='name'
Query B:
SELECT
x_id
FROM
mytable
WHERE
x_key='hide'
AND
x_value='0'
I just don't find the correct way to do that.
How can I?
I'm really sorry for the explanation but I'm not english and it is very hard to explain.
If i have understood you correct you want to select the elements that have a specific x_key with x_value = '0' and that are not hidden (x_key != 'hide').
EDIT (according to your edit):
SQL Fiddle
SELECT bb.x_value
FROM mytable AS aa
INNER JOIN mytable AS bb
ON aa.x_id = bb.x_id
WHERE aa.x_key = 'hide' AND aa.x_value = 0 AND bb.x_key = 'name';
OLD ANSWER (before your edit):
SELECT x_id, x_key, x_value
FROM mytable
WHERE x_key='name' AND x_key != 'hide' AND x_value = '0'
You should use join to connect two instances of the table - one for the names and one for the 'hides'
select n.x_id, n.x_value from mytable as h inner join myable as n on
h.x_id = n.x_id where n.x_key = 'name' and h.x_key = 'hide' and H.x_value = 0;
while this will work, I think it's not a good practice to have two types of data in the same table. I'd recommend you to split it to two tables- one for names and one for hides
If I understand you correct you want combine 2 'SELECT' with different 'WHERE' statments. You can use 'OR' statment
SELECT x_id,x_value FROM mytable WHERE x_key='name' OR x_key='hide' AND x_value='0'
Hi there i have two tables a2_deal(I havent mentioned entire table as its very big)
deviceID companyID stage serverTime
1 14 -1 1349449200
1 1 -1 1349445600
2 21 -1 1349449200
3 17 -1 1349447160
1 14 3 1344449200
1 14 2 1340449200
and another table called a2_comp
companyID name
1 Microsoft
14 DELL
15 APPLE
17 Google
I am trying to get the most recent stage of a company By using below query:
SELECT deal.companyID, companies.name as Company,
if(max(serverTime),stage,Null) as Stage
FROM `a2_deal` AS deal
LEFT JOIN `a2_comp` AS companies ON deal.companyID = companies.companyID
GROUP BY companyID
ORDER BY serverTime
in my query i am using if(max(serverTime),stage,Null) as Stage which means select the stage value related to most recent server time . ie it should give me -1 as the stage of companyID 14.... But for some reason i am not getting correct output..Please explain how my logic is wrong here... Thank You
You want the groupwise maximum:
SELECT a2_comp.*, a2_deal.*
FROM a2_deal NATURAL JOIN (
SELECT companyID, MAX(serverTime) AS serverTime
FROM a2_deal
GROUP BY companyID
) t JOIN a2_comp USING (companyID)
See it on sqlfiddle.
case is used for inline conditions in your query. Also, you may need to do
(case when max(serverTime) = serverTime then stage else null end) as Stage
I'm not totally sure that's valid, but you can try it out.
Try this
SELECT deal.companyID, deal.stage, comp.name
FROM a2_deal AS deal, a2_comp AS comp
WHERE deal.serverTime =
(SELECT MAX(deal2.serverTime)
FROM a2_deal AS deal2
WHERE deal2.companyID = deal.companyID)
AND comp.companyID = deal.companyID
GROUP BY deal.companyID
This might be a little confusing but the most interesting part is the sub query which selecting recent serverTime for each company. I have used theta style query and hence JOIN is not necessary.
What I'd like to do is for a gaming application I need to search for my non player characters and they have a field called target_id that stores the id of whatever they are chasing.
given:
table mobs with fields and some example data
id x y target_id
1 1 1 2
2 3 3 1
I would like to return the following data with a query
id x y target_id target_x target_y
1 1 1 2 3 3
2 3 3 1 1 1
This is what I tried but it has syntax errors
SELECT id,x,y,target_id, target.x, target.y FROM mobs LEFT JOIN mobs AS target ON target_id=id FROM mobs WHERE 1
I don't know why you have a WHERE 1 or the second FROM, but I believe that this is what you want:
SELECT M.id, M.x, M.y, M.target_id, T.x, T.y
FROM mobs AS M
LEFT JOIN mobs AS T
ON M.target_id = T.id
In the future, you should post your table definition, and the expected result so your question is more clear.
Correct syntax as far as I know is:
SELECT mobs.id, mobs.x, mobs.y, mobs.target_id, target.x, target.y
FROM mobs
LEFT JOIN mobs AS target
ON mobs.target_id = target.id
You've already specified the 'FROM' by saying 'JOIN' and you don't need a WHERE when you don't need to filter any rows
Edit: sorry I didn't put the aliases in - you need to make sure the last part (and the fields in the select) have which tables you want to target - remember, saying target_id doesn't mean much if you have two tables in the query with the same column name. You will get an ambiguity error otherwise. I've added the aliases to the query
Here is the scenario. I have 1 table that has all the contact details. Another table that has all the list of Categories. And a 3rd table which is an associate table, that has the ID of the first table and the ID of the second table.
This is how my associate table looks like
contactdid -2 | categoryid -1
contactdid -2 | categoryid -2
contactdid -2 | categoryid -3
contactdid -3 | categoryid -1
contactdid -3 | categoryid -3
This is my SQL code below(Generated using SQLyog and i included the where clause).
SELECT
press_contacts.email
FROM
contacts_category
INNER JOIN press_category
ON (contacts_category.categoryid = press_category.id)
INNER JOIN press_contacts
ON (contacts_category.contactdid = press_contacts.id)
WHERE contacts_category.categoryid = 1 AND contacts_category.categoryid = 2 ;
I get the output when I do not have AND contacts_category.categoryid = 2inserted in the code.
Any idea how to solve this.I clearly have data.
Thanks in advance for the help.
contacts_category.categoryid can not be 1 and 2 at the same time, perhabs you mean OR instead of AND?
Use OR or IN() instead of AND.
A field can't have two values at the same time
If you only want to see those email addresses with contacts in both categories, try:
SELECT press_contacts.email
FROM contacts_category
INNER JOIN press_contacts
ON (contacts_category.contactdid = press_contacts.id)
WHERE contacts_category.categoryid in (1, 2)
GROUP BY press_contacts.email
HAVING COUNT(DISTINCT contacts_category.categoryid)=2