I have two tables. One for elements (leads) and one for that elements properties (leads_properties).
Leads table columns, useful to solve this issue, are: id, token.
Properties table is something like this:
id label value
1 phone 555333666
3 phone 111222555
3 city Milan
I am trying to extract with a single query a lead and all the requested properties. If i ask for city, i will retrieve all leads info joined wit city property only, if i ask for city and phone i will retrieve even phone.
The query i am trying is:
SELECT leads.* ,
p1.value as 'phone' ,
p2.value as 'city'
FROM leads
LEFT JOIN leads_properties as p1 ON leads.id = p1.lead_id
LEFT JOIN leads_properties as p2 ON leads.id = p2.lead_id
WHERE leads.id = 1
AND p1.label = 'phone'
AND p2.label = 'city'
AND leads.token = 'xxxxx'
LIMIT 1
This is working great if all the requested proerties are present in DB (in this example for the lead id=3) but fails and return 0 lines for lead id=1 that didn't had "city" property.
I understand why (the AND clause in WHERE statement probably is restrictive) but i don't understand how to solve the issue.
I would like to retrieve a single line like this (if all the requested properties are in DB)
id token city phone
3 xxxxx Milan 111222555
Or like this (with empty or NULL value) if some of the requested properties are not in DB:
id token city phone
1 xxxxx 111222555
Thanks so much.
You can use conditional aggregation using case when expression
SELECT leads.id,max(case when p1.label = 'city' then p1.value end) as city
max(case when p1.label = 'phone' then p1.value end) as phone
FROM leads
LEFT JOIN leads_properties as p1 ON leads.id = p1.lead_id
WHERE leads.id = 1
group by leads.id
It is not AND being restrictive, but rather asking p2.label = 'city'. If you want any property you probably can just ask to avoid duplication. For example:
SELECT leads.* ,
p1.value as 'phone' ,
p2.value as 'city'
FROM leads
LEFT JOIN leads_properties as p1 ON leads.id = p1.lead_id
LEFT JOIN leads_properties as p2 ON leads.id = p2.lead_id
WHERE leads.id = 1
AND p1.label > p2.label
AND leads.token = 'xxxxx'
LIMIT 1
Related
thank you all for taking the time to read and help if you can! I have a query below that is getting large and messy, I was hoping someone could point me in the right direction as I am still a beginner.
SELECT
DATE(s.created_time_stamp) AS Date,
s.security_profile_id AS Name,
COUNT(*) AS logins,
CASE
WHEN COUNT(s.security_profile_id) <= 1
THEN '1'
WHEN COUNT(s.security_profile_id) BETWEEN 2 AND 3
THEN '2-3'
ELSE '4+'
END AS sessions_summary
FROM session AS s
INNER JOIN member AS m
ON s.security_profile_id = m.security_profile_id
JOIN member_entitlement AS me ON m.id = me.member_id
JOIN member_package AS mp ON me.id = mp.member_entitlement_id
**JOIN member_channels AS mc ON mc.member_id = m.id**
where member_status = 'ACTIVE'
and metrix_exempt = 0
and m.created_time_stamp >= STR_TO_DATE('03/08/2022', '%m/%d/%Y')
and display_name not like 'john%doe%'
and email not like '%#aeturnum.com'
and email not like '%#trendertag.com'
and email not like '%#sargentlabs.com'
and member_email_status = 'ACTIVE'
and mp.package_id = 'ca972458-bc43-4822-a311-2d18bad2be96'
and display_name IS NOT NULL
and s.security_profile_id IS NOT NULL
**and mc.id IS NOT NULL**
GROUP BY
DATE(created_time_stamp),
Name
ORDER BY
DATE(created_time_stamp),
Name
The two parts of the query with asterisks are the two most recently added clauses and they skew the data. Without these, the query runs fine. I am trying get a session summary which works fine, but I only want the sessions of people who have a 'channel' created. Maybe mc.id IS NOT NULL is not the way to do this. I will share my query that shows me how many people have created channels. Essentially, I am trying to combine these two queries in the cleanest way possible. Any advice is greatly appreciated!
-- Users that have Topic Channels and Finished Set Up FOR TRIAL DASH**
select count(distinct(m.id)) AS created_topic_channel
from member m right join member_channels mc on mc.member_id = m.id
left join channels c on c.id = mc.channels_id
JOIN member_entitlement AS me ON m.id = me.member_id
JOIN member_package AS mp ON me.id = mp.member_entitlement_id
where title not like '# Mentions'
and member_status = 'ACTIVE'
and metrix_exempt = 0
and m.created_time_stamp >= STR_TO_DATE('03/08/2022', '%m/%d/%Y')
and display_name not like 'john%doe%'
and email not like '%#aeturnum.com'
and email not like '%#trendertag.com'
and email not like '%#sargentlabs.com'
and member_email_status = 'ACTIVE'
and display_name IS NOT NULL
and mp.package_id = 'ca972458-bc43-4822-a311-2d18bad2be96';
The metric I am trying to retrieve from the DB is how many users have created a channel and logged in at least twice. Thank you again and have a wonderful day!!
If id is the primary key of member_channels then it does not make sense to check if it is null.
If all you want is to check whether a member has a 'channel' created, then instead of the additional join to member_channels, which may cause the query to return more rows than expected, you could use EXISTS in the WHERE clause:
where member_status = 'ACTIVE'
and .......................
and EXISTS (SELECT 1 FROM member_channels AS mc WHERE mc.member_id = m.id)
I would guess your tables aren't at the same level of granularity. A member may have many sessions, and 0-many channels.
eg if member 123 has five sessions and creates three channels => 15 rows of data in this join.
To adjust for this, it's best practice to join on the same level of granularity. You could roll up sessions to the member level, channels to the member level, and then join both against members.
I'm not good with sql so i need help exporting my customer's first names, email address, their country and if possible last times they had access to the store.
I managed to get email and first name by using this query :
SELECT firstname, lastname, email, active FROM psdb_customer
From what i understood, since the other data is stored in a different db table, i should use a join to get data from both tables but i haven't been able to figure out how
Any help is welcome
In the past, I helped someone with something similar in the PrestaShop forum. This query should work, just remember that to get a country of a customer they should have at least one address registered and of course I'm using the default db prefix:
SELECT a.`firstname`,
a.`lastname`,
a.`email`,
(SELECT c.`date_add`
FROM `ps_guest` g
LEFT JOIN `ps_connections` c ON c.`id_guest` = g.`id_guest`
WHERE g.`id_customer` = a.`id_customer`
ORDER BY c.`date_add` DESC LIMIT 1) AS `last_activity`,
(SELECT cl.`name`
FROM `ps_address` ad
LEFT JOIN `ps_country_lang` cl ON cl.`id_country` = ad.`id_country`
WHERE ad.`id_customer` = a.`id_customer`
ORDER BY ad.`id_address` DESC LIMIT 1) AS `country_name`
FROM `ps_customer` a
Rolige's answer is what i was looking for.
Here is another query that allows filtering the results by country (using the id_country)
SELECT SQL_CALC_FOUND_ROWS a.`id_address`,
a.firstname as firstname,
a.lastname as lastname,
cl.id_country as country, cl.`name` as country
FROM `ps_address` a
LEFT JOIN `ps_country_lang` cl ON (cl.`id_country` = a.`id_country`
AND cl.`id_lang` = 1)
LEFT JOIN `ps_customer` c ON a.id_customer = c.id_customer
WHERE 1 AND a.id_customer != 0
AND c.id_shop IN (1)
AND a.`deleted` = 0
AND cl.`id_country` = '8'
ORDER BY a.`id_address` ASC
Basically I have three MySQL tables:
Users - contains base information on users
Fields - describes additional fields for said users (e.g. location, dob etc.)
Data - Contains user data described via links to the fields table
With the basic design as follows (the below is a stripped down version)
Users:
ID | username | password | email | registered_date
Fields
ID | name | type
Data:
ID | User_ID | Field_ID | value
what I want to do is search Users by the values for the fields they have, e.g. example fields might be:
Full Name
Town/City
Postcode
etc.
I've got the following, which works when you're only wanting to search by one field:
SELECT `users`.`ID`,
`users`.`username`,
`users`.`email`,
`data`.`value`,
`fields`.`name`
FROM `users`,
`fields`,
`data`
WHERE `data`.`Field_ID` = '2'
AND `data`.`value` LIKE 'london'
AND `users`.`ID` = `data`.`User_ID`
AND `data`.`Field_ID` = `fields`.`ID`
GROUP BY `users`.`ID`
But what about if you want to search for Multiple fields? e.g. say I want to search for Full Name "Joe Bloggs" With Town/City set to "London"? This is the real sticking point for me.
Is something like this possible with MySQL?
I'm going with the assumption that "searching multiple fields" is talking about the Entity-Attribute-Value structure.
In that case, I propose that the first step is to create a derived query - basically, we want to limit the "EAV data joined" to only include the records that have the values we are interested in finding. (I've altered some column names, but the same premise holds.)
SELECT d.userId
FROM data d
JOIN fields f
ON f.fieldId = d.fieldId
-- now that we establish data/field relation, filter rows
WHERE f.type = "location" AND d.value = "london"
OR f.type = "job" AND d.value = "programmer"
This resulting rows are derived from the filtered EAV triplets that match our conditions. Only the userId is selected in this case (as it will be used to join against the user relation), but it is also possible to push fieldId/value/etc through.
Then we can use all of this as a derived query:
SELECT *
FROM users u
JOIN (
-- look, just goes in here :)
SELECT DISTINCT d.userId
FROM data d
JOIN fields f
ON f.fieldId = d.fieldId
WHERE f.type = "location" AND d.value = "london"
OR f.type = "job" AND d.value = "programmer"
) AS e
ON e.userId = u.userId
Notes:
The query planner will figure all the RA stuff out peachy keen; don't worry about this "nesting" as there is no dependent subquery.
I avoid the use of implicit cross-joins as I feel they muddle most queries, this case being a particularly good example.
I've "cheated" and added a DISTINCT to the derived query. This will ensure that at most one record will be joined/returned per user and avoids the use of GROUP BY.
While the above gets "OR" semantics well (it's both easier and I may have misread the question), modifications are required to get "AND" semantics. Here are some ways that the derived query can be written to get such. (And at this point I must apologize to Tony - I forget that I've already done all the plumbing to generate such queries trivially in my environment.)
Count the number of matches to ensure that all rows match. This will only work if each entity is unique per user. It also eliminates the need for DISTINCT to maintain correct multiplicity.
SELECT d.userId
FROM data d
JOIN fields f
ON f.fieldId = d.fieldId
-- now that we establish data/field relation, filter rows
WHERE f.type = "location" AND d.value = "london"
OR f.type = "job" AND d.value = "programmer"
GROUP BY d.userId
HAVING COUNT(*) = 2
Find the intersecting matches:
SELECT d.userId
FROM data d
JOIN fields f ON f.fieldId = d.fieldId
WHERE f.type = "location" AND d.value = "london"
INTERSECT
SELECT d.userId
FROM data d
JOIN fields f ON f.fieldId = d.fieldId
WHERE f.type = "job" AND d.value = "programmer"
Using JOINS (see Tony's answer).
SELECT d1.userId
FROM data d1
JOIN data d2 ON d2.userId = d1.userId
JOIN fields f1 ON f1.fieldId = d1.fieldId
JOIN fields f2 ON f2.fieldId = d2.fieldId
-- requires AND here across row
WHERE f1.type = "location" AND d1.value = "london"
AND f2.type = "job" AND d2.value = "programmer"
An inner JOIN itself provides conjunction semantics when applied outside of the condition. In this case I show "re-normalize" the data. This can also be written such that [sub-]selects appear in the select clause.
SELECT userId
FROM (
-- renormalize, many SO questions on this
SELECT q1.userId, q1.value as location, q2.value as job
FROM (SELECT d.userId, d.value
FROM data d
JOIN fields f ON f.fieldId = d.fieldId
WHERE f.type = "location") AS q1
JOIN (SELECT d.userId, d.value
FROM data d
JOIN fields f ON f.fieldId = d.fieldId
WHERE f.type = "job") AS q2
ON q1.userId = q2.userId
) AS q
WHERE location = "london"
AND job = "programmer"
The above duplicity is relatively easy to generate via code and some databases (such as SQL Server) support CTEs which make writing such much simpler. YMMV.
If I understood you right, this is what you want:
FROM `users`,
`fields`,
`data` `location`
`data` `name`
WHERE `location`.`Field_ID` = '2'
AND `location`.`value` LIKE 'london'
AND `location`.`Field_ID` = `fields`.`ID`
AND `name`.`Field_ID` = 'whathere? something for its name'
AND `name`.`value` LIKE 'london'
AND `name`.`Field_ID` = `fields`.`ID`
AND `users`.`ID` = `data`.`User_ID`
I'd prefer joins though
Well here you hit one of the downsides of the EAV you are using
SELECT u.ID, u.username,u.email, d1.value, f1.Name, d2.Value, f2.name
FROM `users` u,
inner join data d1 On d1.User_id = u.id
inner join data d2 On d2.User_id = u.id
inner join fields f1 on f1.id = d1.field_id
inner join fields f2 on f2.id = d2.field_id
WHERE d1.Field_id = '2' and d1.Value = 'london'
and d2.field_id = '??' and d2.value = 'Joe Bloggs'
GROUP BY `users`.`ID`
Messy isn't it? Bet you can't wait to go for, four or five values. Or think about (Forename = Joe Or surname = Bloggs) and City = London...
I have this database. It does not contain all the tables, but for my problem what is included in the picture is enough.
The database is designed for transportation companies.
So, I have a booking. Any booking can have multiple addresses. These types are (routing_type: pick-up, stop, drop-off). My addresses are either a street address or an airport.
Inside routing table is use either the address_id or the airport_id to tell which type the routing is. If airport_id has a number than address_id is NULL.
In my booking_routing table I have as many entries as there are routing types for a specific booking. If I have 3 addresses for a specific booking, I will have 3 entries in booking_routing (maybe Pick-up, then Stop and then Drop-off). Usually there are only two addresses necessary, pick-up an drop-off.
PROBLEM: I try to create a query in which I will have displayed my Pick-up and Drop-off point on the same line with other fields from the booking.
Example:
Booking_ID Account_ID ... Pick-Up Drop-Off
121 32 1 Main St IAD, AA-322
Right now I only managed to get them using LEFT JOIN on two lines.
Like this:
Booking_ID Account_ID ... Address_Type Address
121 32 Pick_up 1 Main St
121 32 Drop-Off IAD, AA-322
SELECT
b.booking_id as ID, a.account_id as Acc_ID,
MAX(CASE WHEN br.routing_type_id = 1 THEN -- 1=pick-up
Concat(ad.address_line1, " ", api.code, " ", aii.code, "-", ap.flight_number) END) as Pick_up,
MAX(CASE WHEN br.routing_type_id = 4 THEN -- 4=drop-off
Concat(ad.address_line1, " ", api.code, " ", aii.code, "-", ap.flight_number) END) as Drop_off
FROM booking b
left JOIN account a ON b.account_id = a.account_id
left join booking_routing br ON b.booking_id = br.booking_id
left join routing r ON br.routing_id = r.routing_id
left join routing_type rt ON br.routing_type_id = rt.routing_type_id
left join address ad ON r.address_id = ad.address_id
left join airport ap ON r.airport_id = ap.airport_id
left join airport_info api ON ap.airport_info_id = api.airport_info_id
left join airline_info aii ON ap.airline_info_id = aii.airline_info_id
group by b.booking_id, a.account_id;
You can achieve this by using MAX and CASE:
SELECT Booking_Id,
Account_Id,
MAX(CASE WHEN Address_Type = 'Pick_up' THEN Address END) Pick_Up,
MAX(CASE WHEN Address_Type = 'Drop-Off' THEN Address END) Drop_Off
FROM YourTables...
GROUP BY Booking_Id, Account_Id
SQL Fiddle Demo
I have 3 tables
person (id, name)
area (id, number)
history (id, person_id, area_id, type, datetime)
In this tables I store the info which person had which area at a specific time. It is like a salesman travels in an area for a while and then he gets another area. He can also have multiple areas at a time.
history type = 'I' for CheckIn or 'O' for Checkout.
Example:
id person_id area_id type datetime
1 2 5 'O' '2011-12-01'
2 2 5 'I' '2011-12-31'
A person started traveling in area 5 at 2011-12-01 and gave it back on 2011-12-31.
Now I want to have a list of all the areas all persons have right now.
person1.name, area1.number, area2.number, area6.name
person2.name, area5.number, area9.number
....
The output could be like this too (it doesn't matter):
person1.name, area1.number
person1.name, area2.number
person1.name, area6.number
person2.name, area5.number
....
How can I do that?
This question is, indeed, quite tricky. You need a list of the entries in history where, for a given user and area, there is an 'O' record with no subsequent 'I' record. Working with just the history table, that translates to:
SELECT ho.person_id, ho.area_id, ho.type, MAX(ho.datetime)
FROM History AS ho
WHERE ho.type = 'O'
AND NOT EXISTS(SELECT *
FROM History AS hi
WHERE hi.person_id = ho.person_id
AND hi.area_id = ho.area_id
AND hi.type = 'I'
AND hi.datetime > ho.datetime
)
GROUP BY ho.person_id, ho.area_id, ho.type;
Then, since you're really only after the person's name and the area's number (though why the area number can't be the same as its ID I am not sure), you need to adapt slightly, joining with the extra two tables:
SELECT p.name, a.number
FROM History AS ho
JOIN Person AS p ON ho.person_id = p.id
JOIN Area AS a ON ho.area_id = a.id
WHERE ho.type = 'O'
AND NOT EXISTS(SELECT *
FROM History AS hi
WHERE hi.person_id = ho.person_id
AND hi.area_id = ho.area_id
AND hi.type = 'I'
AND hi.datetime > ho.datetime
);
The NOT EXISTS clause is a correlated sub-query; that tends to be inefficient. You might be able to recast it as a LEFT OUTER JOIN with appropriate join and filter conditions:
SELECT p.name, a.number
FROM History AS ho
JOIN Person AS p ON ho.person_id = p.id
JOIN Area AS a ON ho.area_id = a.id
LEFT OUTER JOIN History AS hi
ON hi.person_id = ho.person_id
AND hi.area_id = ho.area_id
AND hi.type = 'I'
AND hi.datetime > ho.datetime
WHERE ho.type = 'O'
AND hi.person_id IS NULL;
All SQL unverified.
You're looking for results where each row may have a different number of columns? I think you may want to look into GROUP_CONCAT()
SELECT p.`id`, GROUP_CONCAT(a.`number`, ',') AS `areas` FROM `person` a LEFT JOIN `history` h ON h.`person_id` = p.`id` LEFT JOIN `area` a ON a.`id` = h.`area_id`
I haven't tested this query, but I have used group concat in similar ways before. Naturally, you will want to tailor this to fit your needs. Of course, group concat will return a string so it will require post processing to use the data.
EDIT I thikn your question has been edited since I began responding. My query does not really fit your request anymore...
Try this:
select *
from person p
inner join history h on h.person_id = p.id
left outer join history h2 on h2.person_id = p.id and h2.area_id = h.area_id and h2.type = 'O'
inner join areas on a.id = h.area_id
where h2.person_id is null and h.type = 'I'