I have two tables in my database.
Couples table:
+---------------------------------------+
| ID | Partner 1 | Partner 2 |
+---------------------------------------+
| 1 | 101 | 102 |
+---------------------------------------+
B table:
+--------------------------------------------------------------
| ID | name | date | Letter | Phonenumber
+--------------------------------------------------------------
| 101| Mark | 1/1/2001 | D | 061234
| 102| lisa | 1/1/2002 | E | 061235
I cant quite figure out how to do the following:
Select from couples table the partners 1 & 2.
From partner 1, grab the name, date, letter & phonenumber.
From partner 2, grab the name, letter and date.
Do this for every couple in the couples table
I cant figure out how to do this, anyone know how? I have been stuck for quite some time now haha.
something like this
+------------------------------------------------------------------------
| ID | name | date | Letter | Phonenumber | name | Letter| date
+------------------------------------------------------------------------
| 1 | Mark | 1/1/2001 | D | 061234 | lisa | E | 1/1/2002
+------------------------------------------------------------------------
You need to join twice - once for each partner. e.g.:
SELECT p1.id, p1.name, p1.date, p1.letter, p1.phonenumber, p2.name, p2.letter, p2.date from couples
JOIN B on (B.id = partner_1) as p1
JOIN B on (B.id = partner_2) as p2
My syntax may not be perfect, but it sounds like you know enough SQL to not need a copy+paste solution, just a pointer on how to solve.
Related
I'm trying to join two tables together in MySQL. I need to join based on the full string from one field (Table a:ID) and the sub-string from the other table (Table b:caseID). A mock-up of the table structure can be seen at the bottom of this post. ID and caseID are defined as unique.
The output I'm looking for is similar to:
|-------------|--------------|------------|
| ID | name | age |
|-------------|--------------|------------|
| 1 | Bob | 22 |
| 2 | Bill | 23 |
| 3 | Ben | 24 |
|-------------|--------------|------------|
I know how to extract a substring based on a delimiter:
SELECT SUBSTRING(caseID, LOCATE('-', caseID)+1, LENGTH(caseID)) AS ExtractString FROM b
but I'm unclear how to combine this with the usual SQL JOIN statement to return all joined records. I keep getting error like 'returns more than one row'.
Any help much appreciated.
Table a:
|-------------|--------------|
| ID | name |
|-------------|--------------|
| 1 | Bob |
| 2 | Bill |
| 3 | Ben |
|-------------|--------------|
Table b:
|-------------|--------------|
| caseID | age |
|-------------|--------------|
| 24-1 | 22 |
| 24-2 | 23 |
| 24-3 | 24 |
|-------------|--------------|
SELECT *
FROM a
LEFT JOIN b ON a.ID = SUBSTRING(b.caseID, LOCATE('-', b.caseID)+1, LENGTH(b.caseID))
SELECT *
FROM a
JOIN b ON a.ID = SUBSTRING_INDEX(b.caseID, '-', -1)
Typical, as soon as I ask the question I work out the answer!
SELECT a.*, b.*
FROM a
JOIN b
ON b.id = SUBSTRING(a.caseID, LOCATE('-', a.caseID)+1, LENGTH(a.caseID))
I'm still working through some kinks with MySQL so any help will be appreciated.
I have 3 tables -- equipment, states, zones.
equipment:
+---------------+------+------------+
| current_state | id | ...columns |
+---------------+------+------------+
states:
+----------+-------------+
| state | zone_id |
+----------+-------------+
zones:
+-----+------+
| id | zone |
+-----+------+
In equipment, there is one current_state per row.
In states, there is one zone_id per row.
In zones, there is one zone per row.
I would like to JOIN the three tables as a subquery select statement (not even sure if that's a thing) and have the output return as 1 alias'd column among the other columns I'm selecting
+--------------+-------------+
| current_zone | ....columns |
+--------------+-------------+
A sample expected output is:
+------------+-------------+--------+------------------+--------------+---------+
| c_id | g_id | e_id | equipment_type | impressionId | email |
+------------+-------------+--------+------------------+--------------+---------+
| 1234 | ABC1234 | 0001 | VEST | 2032 |ab#yc.com|
| 1234 | 1234ABC | 0001 | SHIRT | 4372 |ab#yc.com|
| 1234 | DCBA123 | 0001 | CAN | 4372 |ab#yc.com|
| 1234 | DCBA321 | 0001 | JACKET | ab#yc.com |ab#yw.com|
| 4567 | abc321d | 0002 | SHIRT | 2032 |db#yw.com|
| 4567 | cba123d | 0002 | CAN | 4372 |db#yw.com|
| 4567 | def4rg4 | 0002 | JEANS | 3210 |db#yw.com|
+------------+-------------+--------+------------------+--------------+---------+
The current query has multiple joins already referring to the zones and states table in order to determine a different value:
SELECT equipment.*,
...
FROM equipment
LEFT JOIN c on equipment.c_id = c.id
LEFT JOIN g on equipment.g_id = g.id
LEFT JOIN states on g.state = states.state
LEFT JOIN zones on zones.id = states.zone_id
Essentially, what I want to do is create a subquery in order to create a new column based on the results of the three joins, something like this:
SELECT equipment.*,
(SELECT
equipment.current_state
FROM equipment
LEFT JOIN equipment.current_state = states.state
LEFT JOIN zones.id = states.zone_id
) as current_zone,
...
This is even possible? Am I trying to select a new column in the wrong place?
Thanks to #TheImpaler I was able to clear up my Scalar Subquery. In my eyes, I thought I had to create another join based on the properties I wanted when in reality all I had to do was create a conditional scalar subquery:
SELECT equipment.*,
(SELECT zones.zone
FROM zones
WHERE equipment.current_state = states.state
AND zones.id = states.zone_id
) as current_zone,
...
currently i have two tables with some data. the first table has the following:
+----------------+-----------+
| name | member_id |
+----------------+-----------+
| Juice Box | 49432 |
| Rainsurge | 49631 |
| spiderpigrider | 50482 |
+----------------+-----------+
The second table has the following:
+------------+-----------+
| recruit_id | bin(refs) |
+------------+-----------+
| 49432 | 1 |
| 49631 | 1 |
| 49432 | 1 |
| 49631 | 1 |
| 49432 | 1 |
| 49631 | 1 |
| 49432 | 1 |
| 49631 | 1 |
| 49432 | 1 |
| 49631 | 1 |
+------------+-----------+
I would like to return the name, total refs and member_id/recruit_id like so (listing only users with at least 1 ref)
+------------+-----------+------------+
| recruit_id | name | total_refs |
+------------+-----------+------------+
| 49631 | Rainsurge | 5 |
| 49432 | Juice Box | 5 |
+------------+-----------+------------+
select r.recruit_id,bin(r.refs),ipb.name from refs as r
inner join syndicate_ipb.core_members as ipb on ipb.member_id=r.recruit_id;
this returned my data but obviously without a total count and repeated names/ids
select r.recruit_id,count(bin(r.refs)),ipb.name from refs as r
inner join syndicate_ipb.core_members as ipb on ipb.member_id=r.recruit_id;
this returned data with the total count of everyone but only one id/name
+------------+--------------------+-----------+
| recruit_id | count(bin(r.refs)) | name |
+------------+--------------------+-----------+
| 49432 | 10 | Juice Box |
+------------+--------------------+-----------+
this returns the data but again without a count
select distinct r.recruit_id,bin(r.refs),ipb.name from refs as r
inner join syndicate_ipb.core_members as ipb on ipb.member_id=r.recruit_id;
+------------+-------------+-----------+
| recruit_id | bin(r.refs) | name |
+------------+-------------+-----------+
| 49432 | 1 | Juice Box |
| 49631 | 1 | Rainsurge |
+------------+-------------+-----------+
Any help or guidance is greatly appreciated. I feel like i'm close here but just not competent enough with SQL to get it. thanks!
You were almost there. You just missed the GROUP BY clause at the end.
Query:
SELECT
r.recruit_id,
count(bin(r.refs)),
ipb.name
FROM refs AS r
INNER JOIN syndicate_ipb.core_members AS ipb
ON ipb.member_id = r.recruit_id
GROUP BY r.recruit_id;
Note:
If bin(refs) column always contains value 1 then actually you don't need to keep that column. In that case you can use count(*) or count(r.recruit_id) to get the count.
And if bin(refs) column contains any value then count will not give you the right answer. In that case you need to use sum like Sum( bin(refs)).
You have to use the group by clause:
select r.recruit_id, ipb.name, count(bin(refs)) as total_refs
from refs as r
inner join syndicate_ipb.core_members as ipb
on ipb.member_id=r.recruit_id
group by r.recruit_id, ipb.name
having count(bin(refs)) >= 1
This group by r.recruit_id, ipb.name will group the results and this having count(bin(refs)) >= 1 will garante that it only returns members with at least one ref
Do not only group your columns just by the ones you want. Even though MySql allows it, it is not SQL Ansi pattern and even MySql now is complying with it. Use an aggregation function grouping with your entire columns on the select statement.
SELECT ipb.*, COUNT(`r`.`recruit_id`) AS cid FROM `ipb`
INNER JOIN `r` ON `r`.`join_id` = ipb.`member_id`
GROUP BY ipb.`member_id`
I am trying to join two tables and only select the dealers that did not have their promo code used on any order.
How can I do this?
I'm trying this below, but it's not working right. In the example I want to get just Bob, since his promo_code hasn't been used in any orders.
SELECT d.`name`
FROM z_dealer d
LEFT OUTER JOIN z_order o ON (d.promo_code = o.promo_code)
AND o.promo_code IS NULL
Here are my tables...
mysql> select * from z_dealer;
+----+------+------------+
| id | name | promo_code |
+----+------+------------+
| 1 | John | holiday |
| 2 | Suzy | special |
| 3 | Bob | laborday |
+----+------+------------+
mysql> Select * from z_order;
+----+-------+------------+
| id | total | promo_code |
+----+-------+------------+
| 1 | 10 | holiday |
| 2 | 20 | special |
| 3 | 15 | holiday |
| 4 | 45 | special |
+----+-------+------------+
SELECT d.`name` FROM z_dealer d LEFT JOIN z_order o ON (d.promo_code = o.promo_code) WHERE o.promo_code IS NULL
Have you tried INNER JOIN? or You can try IN like this :
SELECT d.name
FROM z_dealer d
WHERE d.promo_code not in( SELECT promo_code FROM z_order)
I'm not entirely sure why it's not working in your example code. I've created the same tables locally and when I run the script you provided I get the single 'Bob' answer.
SELECT d.name
FROM z_dealer d
LEFT OUTER JOIN z_order o ON (d.promo_code = o.promo_code)
AND o.promo_code IS NULL
What results are you seeing exactly?
I would like to ask a quick question regarding a mysql query.
I have a table named trans :
+----+---------------------+------+-------+----------+----------+
| ID | Date | User | PCNum | Customer | trans_In |
+----+---------------------+------+-------+----------+----------+
| 8 | 2013-01-23 16:24:10 | test | PC2 | George | 10 |
| 9 | 2013-01-23 16:27:22 | test | PC2 | Nick | 0 |
| 10 | 2013-01-24 16:28:48 | test | PC2 | Ted | 10 |
| 11 | 2013-01-25 16:36:40 | test | PC2 | Danny | 10 |
+----+---------------------+------+-------+----------+----------+
and another named customers :
+----+---------+-----------+
| ID | Name | Surname |
+----+---------+-----------+
| 1 | George | |
| 2 | Nick | |
| 3 | Ted | |
| 4 | Danny | |
| 5 | Alex | |
| 6 | Mike | |
.
.
.
.
+----+---------+-----------+
I want to view the sum of trans_in column for specific customers in a date range BUT ALSO include in the result set, those customers that haven't got any records in the selected date range. Their sum of trans_in could appear as NULL or 0 it doesn't matter...
I have the following query :
SELECT
`Date`,
Customer,
SUM(trans_in) AS 'input'
FROM trans
WHERE Customer IN('George','Nick','Ted','Danny')
AND `Date` >= '2013-01-24'
GROUP BY Customer
ORDER BY input DESC;
But this will only return the sum for 'Ted' and 'Danny' because they only have transactions after the 24th of January...
How can i include all the customers that are inside the WHERE IN (...) function, even those who have no transactions in the selected date range??
I suppose i'll have to join them somehow with the customers table but i cannot figure out how.
Thanks in advance!!
:)
In order to include all records from one table without matching records in another, you have to use a LEFT JOIN.
SELECT
t.`Date`,
c.name,
SUM(t.trans_in) AS 'input'
FROM customers c LEFT JOIN trans t ON (c.name = t.Customer AND t.`Date` >= '2013-01-24')
WHERE c.name IN('George','Nick','Ted','Danny')
GROUP BY c.name
ORDER BY input DESC;
Of course, I would mention that you should be referencing customer by ID, and not by name in your related table. Your current setup leads to information duplication. If the customer changes their name, you now have to update all related records in the trans table instead of just in the customer table.
try this
SELECT
`Date`,
Customer,
SUM(trans_in) AS 'input'
FROM trans
inner join customers
on customers.Name = trans.Customer
WHERE Customer IN('George','Nick','Ted','Danny')
GROUP BY Customer
ORDER BY input DESC;