select only modified column name based on the status

SELECT id,
       version,
       RTRIM(
              CASE WHEN quantity != prev_qty THEN 'QTY' || ',' END
           || CASE WHEN securityvalue != prev_security THEN 'SECURITY VALUE' || ',' END
           || CASE WHEN price != prev_price THEN 'PRICE' END,
           ','
       )
           amendment_details
  FROM (SELECT id,
               version,
               quantity,
               datemodified,
               securityvalue,
               price,
               status,
               LAG(status) OVER(PARTITION BY id ORDER BY version) prev_status,
               LAG(quantity) OVER(PARTITION BY id ORDER BY version) prev_qty,
               LAG(securityvalue) OVER(PARTITION BY id ORDER BY version) prev_security,
               LAG(price) OVER(PARTITION BY id ORDER BY version) prev_price
          FROM yourtable t)
 WHERE     status = 'N'
       AND prev_status = 'V'
       AND (quantity != prev_qty OR securityvalue != prev_security OR price != prev_price)


I've made the assumption all of the comparison fields are non-null.

if that's not true, then you'll need to use NVL or COALESCE on the values

for example...

CASE WHEN nvl(quantity,-1) != nvl(prev_qty,-1) THEN 'QTY' || ',' END

Thank you .

Already we are checking for  quantity != prev_qty THEN 'QTY' .then why again in condition we are checking
  AND (quantity != prev_qty OR securityvalue != prev_security OR price != prev_price).Can u please tel me

AND prev_status = 'V'(because of this i am getting prev_status is invalid identifier error .
can we assign like that as u gave.

the check in the where clause is to only return rows where at least one of those columns changes.

The check in the case is to display which columns change.


I tested the query I posted.  The syntax is valid.
If you're getting an invalid identifier error, did you change the query?  If so, what is the code you ran?

select id, version,
      rtrim(case when version>1 and quantity!=prev_quantity then 'qty-' end ||
      case when version>1 and securityvalue!=prev_val then 'val-' end ||
      case when version>1 and price!=prev_price then 'price-' end,'-') changes
from (
      select id, version, quantity, securityvalue, price ,
      lag(status) OVER (partition by .id ,datemodified order by version asc) prev_status,
            lag(quantity) over(partition by id,datemodified order by version asc) prev_quantity,
            lag(securityvalue) over(partition by id,datemodified order by version asc) prev_val,
            lag(price) over(partition by id,datemodified order by version asc) prev_price
      from tab1
      WHERE     status='N'
         AND prev_status='V'
      )

now i am getting invalid error because i am using aliase name to assingn

select id, version,
      rtrim(case when version>1 and quantity!=prev_quantity then 'qty-' end ||
      case when version>1 and securityvalue!=prev_val then 'val-' end ||
      case when version>1 and price!=prev_price then 'price-' end,'-') changes
from (
      select id, version, quantity, securityvalue, price,status,
      lag(status) OVER (partition by .id ,datemodified order by version asc) prev_status,
            lag(quantity) over(partition by id,datemodified order by version asc) prev_quantity,
            lag(securityvalue) over(partition by id,datemodified order by version asc) prev_val,
            lag(price) over(partition by id,datemodified order by version asc) prev_price
      from tab1
)
      WHERE     status='N'
         AND prev_status='V'

like price,quantity,i have to fetch many columns from different table on join condition . like
select id, version, quantity, securityvalue, price,status,
       lag(status) OVER (partition by tab1.id ,tab1.datemodified order by version asc) prev_status,
             lag(tab2.quantity) over(partition by tab1.id,tab1.datemodified order by version asc) prev_quantity,
             lag(tab3.securityvalue) over(partition by tab1.id,tab1.datemodified order by version asc) prev_val,
             lag(tab1.price) over(partition by id,datemodified order by version asc) prev_price
       from tab1,tab2,tab3
where tab1.id=tab2.id
tab1.id=tab3.id
 )status='N'
prev_status=V'---- gives prev_status invalid identifier


now it gives error also if i do like:

  lag(tab3.securityvalue) over(partition by tab1.id,tab1.datemodified order by version asc) prev_val,
             lag(tab1.price) over(partition by id,datemodified order by version asc) prev_price
from tab1,tab2,tab3 ) where  tab1.id=tab2.id
and  tab1.id=tab3.id
 status='N'
prev_status=V'

please guide me .

select id, version, quantity, securityvalue, price,status,
        lag(status) OVER (partition by tab1.id ,tab1.datemodified order by version asc) prev_status,
              lag(tab2.quantity) over(partition by tab1.id,tab1.datemodified order by version asc) prev_quantity,
              lag(tab3.securityvalue) over(partition by tab1.id,tab1.datemodified order by version asc) prev_val,
              lag(tab1.price) over(partition by id,datemodified order by version asc) prev_price
        from tab1,tab2,tab3
 where tab1.id=tab2.id
 tab1.id=tab3.id
  )status='N'
 prev_status=V'---- gives prev_status invalid identifier

Select allOpen in new window

you don't have a where clause

  lag(tab3.securityvalue) over(partition by tab1.id,tab1.datemodified order by version asc) prev_val,
              lag(tab1.price) over(partition by id,datemodified order by version asc) prev_price
 from tab1,tab2,tab3 ) where  tab1.id=tab2.id
 and  tab1.id=tab3.id

Select allOpen in new window

you can't reference tab1, tab2, or tab3 outside of the parentheses

sorry i missed where class to mention in code but i used it.
if i put where class outside for status checking,i cannot reference tables.
or viceversa .i have to reference condition of  both  the tables(where  tab1.id=tab2.id
 and  tab1.id=tab3.id) and  also should check for status.

THANK YOU .

you're welcome, if you don't need anything else, please close the question.

ABOVE code is running fine .along with it i have put condition it should generate only for flows in event(2,3)
the output is giving  10 lines of output for same flow ,i modified quantity,price,security inSAME TIME but it is individually create flows

example:
id   eventflow   amendmentdetails
45   2                    quotation
45  2                     QUOTATION , PRICE
45   2                      QUOTATION PRICE  SECURITYVALUE
45   3                         QUOTATION
45    3                        QUOTATION PRICE
45    3                        QUOTATION ,PRICE,SECURITY VALUE
45    3                       EMPTYBOX

I  NEED
42             2             QUOTATION PRICE  SECURITYVALUE
45    3                        QUOTATION ,PRICE,SECURITY VALUE


Can somebody help me please .
Thanks in advance.

please post a new question with full example of input data and expected output.