SQL - Multiple records into one line with conditions - sql

Question

I have two tables that look like this
Account Table
| Account Number | Account Name |
| -------------- | -------------- |
| 12345 | Bob Jones |
| 12346 | Jenny Smith |
| 12347 | Mary Frederick |
Email Table
| Account Number | Email Type |Email | IsPrimary |
| ---------------------- | --------------|-----------------------|-----------------|
| 12345 | WORK | BOBSMITH#STACK.COM | 0 |
| 12345 | HOME | BOBSMITH#GMAIL.COM | 0 |
| 12345 | WORK | BOBSMITH#APPLE.COM | 1 |
| 12345 | HOME | BOBSMITH#HOTMAIL.COM | 0 |
| 12346 | HOME | JMSMITH#GMAIL.COM | 1 |
| 12346 | WORK | JMSMITH#DISNEY.COM | 0 |
| 12346 | HOME | JMSMITH#HOTMAIL.COM | 0 |
| 12347 | HOME | MFRED#HOTMAIL.COM | 0 |
I need to end up with results like this:
| Account Number | Account Name | Home Email | Work Email | Alternate Email |
| ------------------------ | ----------------- |--------------------|--------------------|----------------------|
| 12345 | Bob Jones | BOBSMITH#GMAIL.COM | BOBSMITH#APPLE.COM | BOBSMITH#HOTMAIL.COM |
| 12346 | Jenny Smith | JMSMITH#GMAIL.COM | JMSMITH#DISNEY.COM | JMSMITH#HOTMAIL.COM |
| 12347 | Mary Frederick | MFRED#HOTMAIL.COM | | |
I have all possible combinations of emails such as multiple work and no home, no primaries at all, multiple primaries... etc.
I need the logic to be:
Home Email: When type is Home. If there is a primary, choose the first one. If there is no primary, choose the first non-primary home email. Otherwise make it blank
Work Email: Same as above but for work
Alternate Email: Any third email on the list. If there are more than 3, choose home over work.
I have tried a ton of things and nothing has worked well. Here is my top attempt -two things don't work about it. The 'top 1' returns a lot of nulls and the code for alternates isn't always mutually exclusive to the home and work email, especially for people that have no primary checked:
select distinct
A01.AccountNumber,
A01.FirstName,
A01.LastName,
(
select top 1
case
when (A07.Active = 1 and A07.EmailType = 'HOME' and A07.UseAsPrimary = 1)
then A07.EmailAddress
when (A07.Active = 1 and A07.EmailType = 'HOME')
then A07.EmailAddress
end
from A07_AccountEmails AS A07
where A07.AccountNumber = A01.AccountNumber
) as HomeEmail
,(
select top 1
case
when (A07.Active = 1 and A07.EmailType = 'WORK' and A07.EmailType is not null)--and A07.UseAsPrimary = 1)
then A07.EmailAddress
when (A07.Active = 1 and A07.EmailType = 'WORK')
then A07.EmailAddress
end
from A07_AccountEmails AS A07
where A07.AccountNumber = A01.AccountNumber
) as WorkEmail
,(
select top 1 (A07.EmailAddress)
from A07_AccountEmails A07
where A07.AccountNumber = A01.AccountNumber
and A07.Active = 1 and A07.UseAsPrimary = 0
) as AlternateEmailMulti
from A01_AccountMaster A01
left outer join A07_AccountEmails A07 on A07.AccountNumber = A01.AccountNumber
where
A01.[Status] = 'A'

Answer 1

It seems a simple sub-query per email address should do the trick? I have added them in an OUTER APPLY to allow the values to be used twice, once in the select, and once to be excluded from the alternate email column.
declare #Account table (Number int, [Name] varchar(64));
declare #Email table (AccountNumber int, [Type] varchar(4), Email varchar(256), IsPrimary bit);
insert into #Account (Number, [Name])
values
(12345, 'Bob Jones'),
(12346, 'Jenny Smith'),
(12347, 'Mary Frederick');
insert into #Email (AccountNumber, [Type], Email, IsPrimary)
values
(12345, 'WORK', 'BOBSMITH#STACK.COM', 0),
(12345, 'HOME', 'BOBSMITH#GMAIL.COM', 0),
(12345, 'WORK', 'BOBSMITH#APPLE.COM', 1),
(12345, 'HOME', 'BOBSMITH#HOTMAIL.COM', 0),
(12346, 'HOME', 'JMSMITH#GMAIL.COM', 1),
(12346, 'WORK', 'JMSMITH#DISNEY.COM', 0),
(12346, 'HOME', 'JMSMITH#HOTMAIL.COM', 0),
(12347, 'HOME', 'MFRED#HOTMAIL.COM', 0);
select A.Number, A.[Name]
, E.Home [Home Email]
, E.Work [Work Email]
, (
select top 1 Email
from #Email
where AccountNumber = A.Number
and Email not in (E.Home, E.Work)
order by case when [Type] = 'HOME' then 1 else 0 end desc
)
from #Account A
outer apply (
select
(select top 1 Email from #Email where AccountNumber = A.Number and [Type] = 'HOME' order by IsPrimary desc),
(select top 1 Email from #Email where AccountNumber = A.Number and [Type] = 'WORK' order by IsPrimary desc)
) E (Home, Work);
Returns your desired results:
Account Number
Account Name
Home Email
Work Email
Alternate Email
12345
Bob Jones
BOBSMITH#HOTMAIL.COM
BOBSMITH#APPLE.COM
BOBSMITH#GMAIL.COM
12346
Jenny Smith
JMSMITH#GMAIL.COM
JMSMITH#DISNEY.COM
JMSMITH#HOTMAIL.COM
12347
Mary Frederick
MFRED#HOTMAIL.COM
NULL
NULL
Note: If you provide your sample data as DDL+DML (as I have here) it makes it much easier for people to assist.

Answer 2

Here is an alternative approach which list all e-mails, primaries first.
We use group_,concat to show all matching entries, order by primary prim inversed by desc and finally a newline separator \n to make a vertical list.
NB : It doesn't print correctly in the terminal because of the newlines.
USE test;
CREATE TABLE user (
acc INT,
nam CHAR(10)
);
INSERT INTO user VALUES ( 1, 'Andrew');
INSERT INTO user VALUES ( 2, 'Bernard');
INSERT INTO user VALUES ( 3, 'Charles');
CREATE TABLE telMail (
acc INT,
email CHAR(25),
type CHAR(5),
prim INT
);
INSERT INTO telMail VALUES(1,'a#w0','Work',0);
INSERT INTO telMail VALUES(1,'a#w1','Work',0);
INSERT INTO telMail VALUES(1,'ap#w2','Work',1);
INSERT INTO telMail VALUES(1,'a#w3','Work',0);
INSERT INTO telMail VALUES(1,'a#h1','Home',0);
INSERT INTO telMail VALUES(1,'a#h2','Home',0);
INSERT INTO telMail VALUES(2,'b#h1','Home',0);
INSERT INTO telMail VALUES(2,'b#w1','Work',0);
INSERT INTO telMail VALUES(2,'b#w2','Work',0);
INSERT INTO telMail VALUES(3,'c#h1','Home',0);
INSERT INTO telMail VALUES(3,'cp#h1','Home',1);
INSERT INTO telMail VALUES(3,'c#w1','Work',0);
SELECT
u.acc 'Account',
u.nam 'Name',
GROUP_CONCAT(DISTINCT w.email ORDER BY w.prim DESC SEPARATOR '\n' ) work_mail,
GROUP_CONCAT(DISTINCT h.email ORDER BY h.prim DESC SEPARATOR '\n' ) home_mail
FROM
(SELECT acc,email,prim FROM telMail WHERE type ='Home') h
JOIN
user u on u.acc=h.acc
JOIN
(SELECT acc,email,prim FROM telMail WHERE type ='Work') w ON u.acc = w.acc
GROUP BY u.acc, u.nam
ORDER BY u.acc;
DROP TABLE user;
DROP TABLE telMail;