Necessary assistance to the query

Hello world

In Oracle 10G

Support to the construction of a query where the data in the Table is
value of type date
6 30
7 0
8 0
9 0
10 10
11 0
12 20
13 0
14 0

Output must be
Value of type date
6 30
7 30
8 30
9 30
10 10
11 10
12 20
13 20
14 20

Where the value is zero there onscreen and previous peak non zero value

I tried to use lead/lag but failed.

Please suggest a way to wright the query

Use NULLIF:

SQL> -- generating sample data:
SQL> with t as (
  2  select 6 dt, 30 val from dual union all
  3  select 7, 0 from dual union all
  4  select 8, 0 from dual union all
  5  select 9, 0 from dual union all
  6  select 10, 10 from dual union all
  7  select 11, 0 from dual union all
  8  select 12, 20 from dual union all
  9  select 13, 0 from dual
 10  )
 11  --
 12  -- actual query:
 13  --
 14  select dt
 15  ,      last_value(nullif(val, 0) ignore nulls) over (order by dt) val
 16  from   t;

        DT        VAL
---------- ----------
         6         30
         7         30
         8         30
         9         30
        10         10
        11         10
        12         20
        13         20

8 rows selected.

Tags: Database

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    $id

    Published by: $id on July 17, 2012 18:36

    plugin. XML->


    http://www.w3.org/2001/XMLSchema-instance">




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    Published by: madhatter on 17 July 2012 22:55

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    Hello..

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    --------------

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    -------------------

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    Kind regards
    VijayRajaram.

    Looks like one already answered Re: rewrite the query, select below or try to get the necessary O/P

    with
customer(name,phone1,phone2,phone3,bitwisephone) as
(select 'a',23456,67890,12345,null from dual union all
 select 'b',67459,89760,37689,null from dual
),
do_not_call(dont_call) as
(select 67890 from dual union all
 select 23456 from dual union all
 select 37689 from dual
)
select name,
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       to_char(mod(trunc(sum(weight)/2),2))||
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  from (select name,phone1 phone,4 weight
          from customer
        union all
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        union all
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 where c.phone = d.dont_call(+)
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 group by name

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    ********************************************

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    JOB_LIST NUM_DEPARTMENTS

    ------------------------------ ---------------

    CLERK                                        2

    ANALYST, CLERK 1

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    >
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