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please help with query


please help with query

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ericb1
ericb1
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This should be straightforward, I just don't know how to write it, any help is appreciated.

I have 2 tables, one lists information about different account types:

ID notes account1 account2 account3 account4 account5
1 notes 1 0 1 0 1
2 notes 0 1 0 1 0
3 notes 1 0 1 0 0

the account types are type "bit" to indicate yes or no that the notes in the row apply to that account type.

The 2nd table is a user table and there is a field called "lastaccounttype" where it lists the last account type a user has been assigned to. SO it would have:

user lastaccounttype
ericb1 account1


I am trying to wite a query that selects only the rows from the notes table where the bit flag for the note is the same account type as the "lastaccounttype". So in the example above, it would only return rows 1 and 3 where the bit flag for "account1" was set to yes (or 1).

Not sure if I need 5 case statements, or if there is another way to write this? Any help is greatly appreciated, thanks!
ib.naji
ib.naji
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I think an easy options is to Pivot using the UNPIVOT statement

This will transpose your Account1, Account2 columns into one column called "AccountType", then you can do a join on AccountType using the LastAccountType of your 2nd table.

So for your query it would look something like this:



;WITH cte as -- Used a CTE to generate the sample values in your 1st table
( SELECT *
FROM
(VALUES(1, 'notes', 1, 0, 1, 0, 1),(2, 'notes', 1, 0, 1, 0, 1),(3, 'notes', 1, 0, 1, 0, 1)) as t(id,note,ac1,ac2,ac3,ac4,ac5) --SAMPLE VALUES
)
SELECT id, note, AccountTypeID,IncludeNote
FROM
(SELECT id, note, ac1, ac2, ac3, ac4, ac5
FROM cte) p
UNPIVOT
(IncludeNote FOR AccountTypeID IN
(ac1, ac2, ac3, ac4, ac5))AS unpvt;




Then you can just join on AccountTypeID using the 2nd table, and filter by IncludeNote

Hope this helps!

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ChrisM@home
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-- sample data
;WITH
MySample (ID, notes, account1, account2, account3, account4, account5) AS (
SELECT 1, 'notes', 1, 0, 1, 0, 1 UNION ALL
SELECT 2, 'notes', 0, 1, 0, 1, 0 UNION ALL
SELECT 3, 'notes', 1, 0, 1, 0, 0),

UserTable ([user], lastaccounttype) AS (SELECT 'ericb1', 'account1' UNION ALL SELECT 'Yotam Ottolenghi','account5')

-- solution
SELECT s.ID, s.notes, x.*, u.[user]
FROM MySample s
CROSS APPLY (
VALUES
(s.account1,'Account1'),
(s.account2,'Account2'),
(s.account3,'Account3'),
(s.account4,'Account4'),
(s.account5,'Account5')
) x (Flag, [Account])
INNER JOIN UserTable u
ON u.lastaccounttype = x.Account
AND x.Flag = 1
ORDER BY u.[user]




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For better assistance in answering your questions, please read this.




Understanding and using APPLY, (I) and (II) Paul White

Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
ScottPletcher
ScottPletcher
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Here's an alternative:


SELECT u.*, n.ID, n.notes
FROM UserTable u
INNER JOIN Notes n ON
(u.lastaccounttype = 'account1' AND n.account1 = 1) OR
(u.lastaccounttype = 'account2' AND n.account2 = 1) OR
(u.lastaccounttype = 'account3' AND n.account3 = 1) OR
(u.lastaccounttype = 'account4' AND n.account4 = 1) OR
(u.lastaccounttype = 'account5' AND n.account5 = 1)



Edit: Added the sql and /code tags around the SQL.

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ericb1
ericb1
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excellent! Thanks for the sample!
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