I'm currently using DBISAM sql compiler. It's very very identical to ms sql compiler, the only difference is that I can't have any nested join statements.
The query below is a nested query that grabs the most recent loan record and the rate. I'm wondering if there's another way I can write this without the nested select statement.
select * from
(select Loan_Id, Max(effectiveDate) as EffectiveDate from InterestTerms
group by Loan_Id) as Y
join InterestTerms as X on Y.Loan_Id = X.Loan_Id and Y.EffectiveDate = X.EffectiveDate
order by Y.Loan_Id
You could try the following:
select
X.*
FROM
InterestTerms AS X
WHERE
X.effectiveDate IN (
select
Max(Y.effectiveDate) as MaxED
from
InterestTerms as Y
WHERE
Y.Loan_Id = X.Loan_Id
)
order by
X.Loan_Id
(UPDATED)
Related
I am pretty new to the new version of SQL Server 2016 and haven't used the new LAG & LEAD functions yet.
If i understood right, it will make work easier in cases where we currently use the ROW_NUMBER() function and furthermore join the results to connect the records in a certain order.
A case where i currently use this way to connect the records is:
;WITH IncrementingRowNums AS
(
SELECT d.MyKey
,d.Outstanding
,d.Rate
,AMO.PaymentAmount
,AMO.AmoDate
,ROW_NUMBER() OVER (PARTITION BY d.MyKey ORDER BY AMO.AmoDate ASC) AS RowNum
FROM Deals d
INNER JOIN Amortization AMO
ON d.MyKey = AMO.MyKey
),
lagged AS
(
SELECT MyKey
,Outstanding AS new_outstanding
,Rate
,PaymentAmount
,AmoDate
,RowNum
FROM IncrementingRowNums
WHERE RowNum = 1
UNION ALL
SELECT i.MyKey
,(l.new_outstanding - l.PaymentAmount)
* (1 + i.Rate * (DATEDIFF(DAY,l.AmoDate, i.AmoDate)/365.25))
AS new_outstanding
,i.Rate
,i.PaymentAmount
,i.AmoDate
,i.RowNum
FROM IncrementingRowNums i
INNER JOIN lagged l
ON i.RowNum = l.RowNum + 1
AND i.MyKey = l.MyKey
Whats the best way to solve this solution with the LAG&LEAD functions?
I tried several ways, but it never worked out.
The only thing i want to calculate is the column new_outstanding.
Which calculates like:
(previous_record.new_outstanding - previous_record.PaymentAmount)
* (1 + current_record.Rate * (DATEDIFF(DAY,previous_record.AmoDate, current_record.AmoDate)/365.25))
As there is no SQL Server 2016 Version on rextester, i can just provide a little test-data and the my old solution of the recursive calculation: http://rextester.com/WVTM46505
Thanks
i'm just learning SQL today and i never thought how fun it's until i'm fiddling with it.
I got a problem and i need a help.
i have 2 tables, Customer and Rate, with details stated below
Customer
idcustomer = int
namecustomer = varchar
rate = decimal(3,0)
with value as described:
idcustomer---namecustomer---rate
1---JOHN DOE---100
2---MARY JANE---90
3---CLIVE BAKER---12
4---DANIEL REYES---47
Rate
rate = decimal(3,0)
description = varchar(40)
with value as described:
rate---description
10---G Rank
20---F Rank
30---E Rank
40---D Rank
50---C Rank
60---B Rank
70---A Rank
80---S Rank
90---SS Rank
100---SSS Rank
Then i ran query below in order to round all values in customer.rate field then inner join it with rate table.
SELECT *, round(rate,-1) as roundedrate
FROM customer INNER JOIN rate ON customer.roundedrate = rate.rate
It didn't produce this result:
idcustomer---namecustomer---rate---roundedrate---description
1---JOHN DOE---100---100---SSS Rank
2---MARY JANE---90---90---SS Rank
3---CLIVE BAKER---12---10---G Rank
4---DANIEL REYES---47---50---C Rank
Is there anything wrong with my code ?
Your query should produce an 'ambigious column' error because you're not specifying a table name when referring to rate (in round(rate,-1)), which exists in both tables.
Also, the where part of a sql query is executed before the select part, so you can't refer to the alias customer.roundedrate in your where statement.
Try this instead
SELECT *, round(customer.rate,-1) as roundedrate
FROM customer INNER JOIN rate ON round(customer.rate,-1) = rate.rate
http://sqlfiddle.com/#!9/e94a60/2
I would suggest a correlated subquery for this:
select c.*,
(select r.description
from rate r
where r.rate <= c.rate
order by r.rate desc
fetch first 1 row only
) as description
from customer c;
Note: fetch first 1 row only is ANSI standard SQL, which some databases do not support. MySQL uses limit. Older versions of SQL Server use select top 1 instead.
I am trying to write a query that would get the customers with 7 consecutive transactions given a list of CustomerKeys.
I am currently doing a self join on Customer fact table that has 700 Million records in SQL Server 2008.
This is is what I came up with but its taking a long time to run. I have an clustered index as (CustomerKey, TranDateKey)
SELECT
ct1.CustomerKey,ct1.TranDateKey
FROM
CustomerTransactionFact ct1
INNER JOIN
#CRTCustomerList dl ON ct1.CustomerKey = dl.CustomerKey --temp table with customer list
INNER JOIN
dbo.CustomerTransactionFact ct2 ON ct1.CustomerKey = ct2.CustomerKey -- Same Customer
AND ct2.TranDateKey >= ct1.TranDateKey
AND ct2.TranDateKey <= CONVERT(VARCHAR(8), (dateadd(d, 6, ct1.TranDateTime), 112) -- Consecutive Transactions in the last 7 days
WHERE
ct1.LogID >= 82800000
AND ct2.LogID >= 82800000
AND ct1.TranDateKey between dl.BeginTranDateKey and dl.EndTranDateKey
AND ct2.TranDateKey between dl.BeginTranDateKey and dl.EndTranDateKey
GROUP BY
ct1.CustomerKey,ct1.TranDateKey
HAVING
COUNT(*) = 7
Please help make it more efficient. Is there a better way to write this query in 2008?
You can do this using window functions, which should be much faster. Assuming that TranDateKey is a number and you can subtract a sequential number from it, then the difference constant for consecutive days.
You can put this in a query like this:
SELECT CustomerKey, MIN(TranDateKey), MAX(TranDateKey)
FROM (SELECT ct.CustomerKey, ct.TranDateKey,
(ct.TranDateKey -
DENSE_RANK() OVER (PARTITION BY ct.CustomerKey, ct.TranDateKey)
) as grp
FROM CustomerTransactionFact ct INNER JOIN
#CRTCustomerList dl
ON ct.CustomerKey = dl.CustomerKey
) t
GROUP BY CustomerKey, grp
HAVING COUNT(*) = 7;
If your date key is something else, there is probably a way to modify the query to handle that, but you might have to join to the dimension table.
This would be a perfect task for a COUNT(*) OVER (RANGE ...), but SQL Server 2008 supports only a limited syntax for Windowed Aggregate Functions.
SELECT CustomerKey, MIN(TranDateKey), COUNT(*)
FROM
(
SELECT CustomerKey, TranDateKey,
dateadd(d,-ROW_NUMBER()
OVER (PARTITION BY CustomerKey
ORDER BY TranDateKey),TranDateTime) AS dummyDate
FROM CustomerTransactionFact
) AS dt
GROUP BY CustomerKey, dummyDate
HAVING COUNT(*) >= 7
The dateadd calculates the difference between the current TranDateTime and a Row_Number over all date per customer. The resulting dummyDatehas no actual meaning, but is the same meaningless date for consecutive dates.
I am trying to update a column called Number_Of_Marks in our Results table using the results we get from our SELECT statement. Our select statement is used to count the numbers of marks per module in our results table. The SELECT statement works and the output is correct, which is
ResultID ModuleID cnt
-------------------------
111 ART3452 2
114 ART3452 2
115 CSC3039 3
112 CSC3039 3
113 CSC3039 3
The table in use is:
Results: ResultID, ModuleID, Number_Of_Marks
We need the results of cnt to be updated into our Number_Of_Marks column. This is our code below...
DECLARE #cnt INT
SELECT #cnt
SELECT C.cnt
FROM Results S
INNER JOIN (SELECT ModuleID, count(ModuleID) as cnt
FROM Results
GROUP BY ModuleID) C ON S.ModuleID = C.ModuleID
UPDATE Results
SET [Number_Of_Marks] = (#cnt)
You can do this in SQL Server using the update/join syntax:
UPDATE s
SET [Number_Of_Marks] = c.cnt
FROM Results S INNER JOIN
(SELECT ModuleID, count(ModuleID) as cnt
FROM Results
GROUP BY ModuleID
) C
ON S.ModuleID = C.ModuleID;
I assume that you want the count from the subquery, not from the uninitialized variable.
EDIT:
In general, when you change the question it is better to ask another question. Sometimes, though, the changes are really small. The revised query looks something like:
UPDATE s
SET [Number_Of_Marks] = c.cnt,
Marks = avgmarks
FROM Results S INNER JOIN
(SELECT ModuleID, count(ModuleID) as cnt, avg(marks * 1.0) as avgmarks
FROM Results
GROUP BY ModuleID
) C
ON S.ModuleID = C.ModuleID;
Note that I multiplied the marks by 1.0. This is a quick-and-dirty way to convert an integer to a numeric value. SQL Server takes averages on integers and produces an integer. Usually you want some sort of decimal or floating value.
I have 2 SQL Tables
unit_transaction
unit_detail_transactions
(tables schema here: http://sqlfiddle.com/#!3/e3204/2 )
What I need is to perform an SQL Query in order to generate a table with balances. Right now I have this SQL Query but it's not working fine because when I have 2 transactions with the same date then the balance is not calculated correctly.
SELECT
ft.transactionid,
ft.date,
ft.reference,
ft.transactiontype,
CASE ftd.isdebit WHEN 1 THEN MAX(ftd.debitaccountid) ELSE MAX(ftd.creditaccountid) END as financialaccountname,
CAST(COUNT(0) as tinyint) as totaldetailrecords,
ftd.isdebit,
SUM(ftd.amount) as amount,
balance.amount as balance
FROM unit_transaction_details ftd
JOIN unit_transactions ft ON ft.transactionid = ftd.transactionid
JOIN
(
SELECT DISTINCT
a.transactionid,
SUM(CASE b.isdebit WHEN 1 THEN b.amount ELSE -ABS(b.amount) END) as amount
--SUM(b.debit-b.credit) as amount
FROM unit_transaction_details a
JOIN unit_transactions ft ON ft.transactionid = a.transactionid
CROSS JOIN unit_transaction_details b
JOIN unit_transactions ft2 ON ft2.transactionid = b.transactionid
WHERE (ft2.date <= ft.date)
AND ft.unitid = 1
AND ft2.unitid = 1
AND a.masterentity = 'CONDO-A'
GROUP BY a.transactionid,a.amount
) balance ON balance.transactionid = ft.transactionid
WHERE
ft.unitid = 1
AND ftd.isactive = 1
GROUP BY
ft.transactionid,
ft.date,
ft.reference,
ft.transactiontype,
ftd.isdebit,
balance.amount
ORDER BY ft.date DESC
The result of the query is this:
Any clue on how to perform a correct SQL that will show me the right balances ordered by transaction date in descendant mode?
Thanks a lot.
EDIT: THINK OF 2 POSSIBLE SOLUTIONS
The problem is generated when you have the same date in 2 transactions, so here is what Im going to do:
Save Date and Time into "date" column. That way there won't be 2 exact dates.
OR
Create a "priority" column and set the priority for each record. So if I found that the date already exists and it has priority = 1 then the current priority will be 2.
What do you think?
There are two ways to do a running sum. I am going to show the syntax on a simpler table, to give you an idea.
Some databases (Oracle, PostgreSQL, SQL Server 2012, Teradata, DB2 for instance) support cumulative sums directly. For this you use the following function:
select sum(<val>) over (partition by <column> order by <ordering column>)
from t
This is a windows function that will calculate the running sum of for each group of records identified by . The order of the sum is .
Alas, many databases don't support this functionality, so you would need to do a self join to do this in a single SELECT query in the database:
select t.column, sum(tprev.<val>) as cumsum
from t left join
t tprev
where t.<column> = tprev.<column> and
t.<ordering column> >= tprev.<ordering column>
group by t.column
There is also the possibility of creating another table and using a cursor to assign the cumulative sum, or of doing the sum at the application level.