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# Subtracting values for two date ranges.

I need to be able to compare values from one month to values of another month and get a difference.
Select
DEF_P
from xxx
where date between 10/1/2014 and 10/31/2014

DEF_P for Oct  - DEF_P for Nov  (not sure if world subtract - need to show if there was a change and the change could be plus or minus.

DEF_P for Oct                        DEF_P for Nov                        Diff
\$120.00                                    \$130.oo                                   \$10
0
leezac
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1 Solution

Commented:
If you restrict the date range to October, where do you expect the November data to come from?

Can you post the table description and sample data to go with your expected results.
Oracle version would help as well.

Off the top of my head maybe something like:

select oct_def_p, nov_def_p, nov_def_p-oct_def_p diff
from (
Select
sum(case when to_char(date,'MM') = '10' then  DEF_P end) oct_def_p,
sum(case when to_char(date,'MM') = '11' then  DEF_P end) nov_def_p
from xxx
where date between 10/1/2014 and 11/30/2014
);
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Commented:
will you need to do this over more than one month? that is, look for differences between april and may, may and june, june and july,  etc?

If so, try something like this, extend the date range for as long of a period as you need.  Note the date ranges are >=  on the low end and <  (not equal)  on the high end

SELECT m,
def_p,
prev_def_p,
prev_def_p - def_p diff
FROM (  SELECT TRUNC(yourdate, 'mm') m,
SUM(def_p) def_p,
LAG(SUM(def_p)) OVER (ORDER BY TRUNC(yourdate, 'mm')) prev_def_p
FROM xxx
WHERE yourdate >= TO_DATE('10/1/2014', 'mm/dd/yyyy')
AND yourdate < TO_DATE('12/1/2014', 'mm/dd/yyyy')
GROUP BY TRUNC(yourdate, 'mm'))
WHERE prev_def_p IS NOT NULL
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Commented:
>>I need to be able to compare values from one month to values of another month and get a difference.<<
The simple answer is select valuesfromonemonth - valuesofanothermonth
If valuesfromonemonth is greater than valuesofanothermonth, the result will be positive and, if not, the result will be negative. How you retrieve values for a given month is another question. Your question is a little vague. Perhaps you can provide some sample data and your expected results.
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Author Commented:
All are great answers - I will look at today and get back with probably more questions and a less vague response also :)
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Author Commented:
Ok this is the code I have and it shows the percents under column DEF_PCNT for each EMP_Number.  Using the AsofDate that is defined this sql returns values for October.   I need to compare two months.  If November, I need to compare to October.  If December I need to compare to November.  I am comparing what EMP_Numbers had a change in DEF_PCNT and doing a count of those that changed percentages between the months.

Example (if employee 1 changed percents in November then I would count him, if not I would not count him).

So my question remains is there to do this in sql (values from different months and show a count).  Thanks in advance.

Oct
Emp Number       DEF_PCNT
1                                       8

Nov
Emp Number       DEF_PCNT
1                                       9

_____________________________________________________________________

DEFINE AsOfDate = TO_DATE('11/01/2014','MM/DD/YYYY')

SELECT
Distinct  EMP_Number, DEF_PCNT
FROM(
SELECT EMP_Number, NVL(DEF_P,0) as DEF_PCNT
FROM yyyy
LEFT JOIN(
SELECT PLAN_ID, ACTY_Date,
n_CUR_CTCH_UP_P + N_CUR_PRE_TAX_SPL_P As DEF_P
FROM xxx
) DFRL ON PART.EMP_ID=DFRL.EMP_ID AND  PART.PLAN_ID=DFRL.PLAN_ID

AND ACTY_Date Between add_months(&AsOfDate,-1) and (&AsOfDate - 1)
)
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Author Commented:
will you need to do this over more than one month? that is, look for differences between april and may, may and june, june and july,  etc?

will do just for two months at a time.
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Author Commented:
and the date value shows as  dd-mmm-yy (01-SEP-14)
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Commented:
WITH monthlydata
AS (SELECT DISTINCT TRUNC(acty_date, 'mm') mon, emp_number, def_pcnt
FROM (SELECT emp_number, NVL(def_p, 0) AS def_pcnt
FROM yyyy part
LEFT JOIN
(SELECT plan_id, acty_date, n_cur_ctch_up_p + n_cur_pre_tax_spl_p AS def_p
FROM xxx) dfrl
ON part.emp_id = dfrl.emp_id
AND part.plan_id = dfrl.plan_id
AND acty_date >= ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1)
SELECT TO_CHAR(m, 'yyyy-mon') mon,
def_pcnt,
prev_def_pcnt,
prev_def_pcnt - def_pcnt diff
FROM (  SELECT mon, def_pcnt, LAG(def_pcnt) OVER (ORDER BY mon) prev_def_pcnt
FROM monthlydata
GROUP BY mon)
WHERE prev_def_pcnt IS NOT NULL;

in this query asofdate is for the 2nd month in your 2month span.

So, enter any date in November and you'll Oct and Nov data compared.

change the mon TO_CHAR to whatever format you want

or using the sum(case) method

WITH monthlydata
AS (SELECT DISTINCT TRUNC(acty_date, 'mm') mon, emp_number, def_pcnt
FROM (SELECT emp_number, NVL(def_p, 0) AS def_pcnt
FROM yyyy part
LEFT JOIN
(SELECT plan_id, acty_date, n_cur_ctch_up_p + n_cur_pre_tax_spl_p AS def_p
FROM xxx) dfrl
ON part.emp_id = dfrl.emp_id
AND part.plan_id = dfrl.plan_id
AND acty_date >= ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1)
SELECT mon1, mon2, mon2 - mon1 diff
FROM (SELECT SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1) THEN def_pcnt END) mon1,
SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate), 1) THEN def_pcnt END) mon2
FROM monthlydata);
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Author Commented:
This row is adding the percents (   n_CUR_CTCH_UP_P + n_CUR_PRE_TAX_DFRL_P + N_CUR_PRE_TAX_SPL_P As DEF_P) then is referenced as DEF_PCNT

DEFINE AsOfDate = TO_DATE('11/01/2014','MM/DD/YYYY')

SELECT
Distinct SSN_Number, DEF_PCNT, ACTY_Date,
TO_CHAR(m, 'yyyy-mon') mon,
def_pcnt,
prev_def_pcnt,
prev_def_pcnt - def_pcnt diff
FROM(
SELECT mon,
def_pcnt,
LAG(def_pcnt) OVER (ORDER BY mon) prev_def_pcnt,
Emp_Number,
NVL(DEF_P,0) as DEF_PCNT, ACTY_Date
FROM monthlydata

LEFT JOIN(
SELECT PLAN_ID, SSN_ID, ACTY_Date,
n_CUR_CTCH_UP_P + n_CUR_PRE_TAX_DFRL_P + N_CUR_PRE_TAX_SPL_P As DEF_P

FROM YYYY
) DFRL ON PART.SSN_ID=DFRL.SSN_ID AND  PART.PLAN_ID=DFRL.PLAN_ID

Where prev_def_pcnt IS NOT NULL
AND DFRL_ACTY_D Between add_months(&AsOfDate,-1) and (&AsOfDate - 1)

Group by mon
)
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Commented:
the WITH clause was part of the solution.

it incorporated your original query, don't change it

just run it as is, except for changing the xxxx and yyyy to your real tables
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Author Commented:
Ok - I am getting an error that I am missing right parenthesis on this line  "    ON part.EMP_id = dfrl.EMP_id'
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Author Commented:
I think I fixed the error.  Still checking.
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Author Commented:
I am having problems with the "mon"   and I need to add a where statement

Where Emp_ID = 1234 from the Part table or the first table.  I am not use to the With statement.  I got the sql to run but I had to take out everywhere the was a "mon."
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Author Commented:
Maybe I need to change the format for the month -  Like I said had to take out any reference to "mon' to run and need to add where plan_id =.

DEFINE AsOfDate = TO_DATE('11/01/2014','MM/DD/YYYY')

WITH monthlydata
AS (SELECT DISTINCT EMP_N, def_pcnt
FROM (SELECT EMP_N, NVL(def_p, 0) AS def_pcnt
FROM dbo.EMP_PART  Part ( get error on this line "missing righ paren"
Where PLAN_ID = 204
LEFT JOIN (
(SELECT plan_id, EMP_ID, ACTY_Date,
n_cur_ctch_up_p + n_cur_pre_tax_spl_p AS def_p
FROM dbo.V_ACTY_DLY) DFRL
ON part.EMP_id = dfrl.EMP_id
AND part.plan_id = dfrl.plan_id
and DFRL_ACTY_D >= ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1)
SELECT
def_pcnt,
prev_def_pcnt,
prev_def_pcnt - def_pcnt diff
FROM (  SELECT def_pcnt, LAG(def_pcnt) OVER (ORDER BY def_pcnt) prev_def_pcnt
FROM monthlydata
GROUP BY DEf_pcnt)
WHERE prev_def_pcnt IS NOT NULL
)
;
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Author Commented:
I will add the mon part back - I just needed to see the sql run.  Not sure why it would not run.
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Author Commented:
With this sql _ I get an error "missing Select" on this line " AND DFRL_ACTY_D < ADD_MONTHS(TRUNC(&asofdate), 1)))"

DEFINE AsOfDate = TO_DATE('11/01/2014','MM/DD/YYYY')
WITH monthlydata
AS (SELECT DISTINCT TRUNC(ACTY_Date, 'mm') mon, emp_number, def_pcnt
FROM (SELECT EMP_N, NVL(def_p, 0) AS def_pcnt
FROM dbo.V_FDPAT_PART) PART
LEFT JOIN
(SELECT plan_id, DFRL_ACTY_D, n_cur_ctch_up_p + n_cur_pre_tax_spl_p AS def_p
FROM dbo.V_ACTY_DLY) DFRL
ON part.EMP_id = dfrl.EMP_id
AND part.plan_id = dfrl.plan_id
--and Part.PLAN_ID = '204'
AND ACTY_Date >= ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1)
SELECT mon1, mon2, mon2 - mon1 diff
FROM (SELECT SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1) THEN def_pcnt END) mon1,
SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate), 1) THEN def_pcnt END) mon2
FROM monthlydata);
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Commented:
You have an extra closing paran.
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Commented:
WITH monthlydata
AS (SELECT DISTINCT TRUNC(acty_date, 'mm') mon, emp_number, def_pcnt
FROM (SELECT emp_n, NVL(def_p, 0) AS def_pcnt
FROM dbo.v_fdpat_part part
LEFT JOIN
(SELECT plan_id,
dfrl_acty_d,
n_cur_ctch_up_p + n_cur_pre_tax_spl_p AS def_p
FROM dbo.v_acty_dly) dfrl
ON part.emp_id = dfrl.emp_id
AND part.plan_id = dfrl.plan_id
--and Part.PLAN_ID = '204'
AND acty_date >= ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1)
SELECT mon1, mon2, mon2 - mon1 diff
FROM (SELECT SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1) THEN def_pcnt END) mon1,
SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate), 1) THEN def_pcnt END) mon2
FROM monthlydata);
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Author Commented:
Ok - appreciate the staying with me as I need to get this done.  I am now getting an error using the above code
ORA-00904: "ACTY_Date": invalid identifier
00904. 00000 -  "%s: invalid identifier"

the ACTY-DATE field is in the DFRL table only.

and I was getting an error on this line  "AND acty_date < ADD_MONTHS(TRUNC(&asofdate), 1)))"

and the date field for ACTY_Date is '02-SEP-14'.
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Author Commented:
Example for each EMP_ID for OCT was there a change in DEF_P from SEPtember
EMP_ID      ACT_Date          DEF_P
096      22-Sep-14              15

EMP_ID      ACT_Date          DEF_P
096      22-OCT-14        10
0

Commented:
this would be a LOT easier with a full example of inputs and outputs.
You have changed the spellings of  columns and we have no way of knowing what the correct ones are

for example - all three of these are names you have posted but I "think" you meant them to be the same thing:

act_date
acty_date
dfrl_acty_d

So all of the code examples above are just guesses - unless you give us a consistent test case to work with, we're basing them off of what you post, there will likely be many typos and misspellings in our code since we can't actually test.  You'll have to fill in the blanks on these yourself.  Or give us something we can test with on our local systems.

Having said that, I "think" this should help

WITH monthlydata
AS (SELECT DISTINCT TRUNC(acty_date, 'mm') mon, emp_n, def_pcnt
FROM (SELECT emp_n, NVL(def_p, 0) AS def_pcnt, acty_date
FROM dbo.v_fdpat_part part
LEFT JOIN
(SELECT plan_id, acty_date, n_cur_ctch_up_p + n_cur_pre_tax_spl_p AS def_p
FROM dbo.v_acty_dly) dfrl
ON part.emp_id = dfrl.emp_id
AND part.plan_id = dfrl.plan_id
--and Part.PLAN_ID = '204'
AND acty_date >= ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1)
SELECT mon1, mon2, mon2 - mon1 diff
FROM (SELECT SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate, 'mm'), -1) THEN def_pcnt END) mon1,
SUM(CASE WHEN mon = ADD_MONTHS(TRUNC(&asofdate), 1) THEN def_pcnt END) mon2
FROM monthlydata);

If you get other "invalid identifier" errors - go through the code and change the column and table names to whatever the real names are and then try again.  If you still have errors after that, post what you used with all of the real names and then we can be sure to use them too and save steps going forward.
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Author Commented:
I understand.  I appreciate the help and feedback
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