Row1-row2(without lead and lag function)

Hello

I wanted less row1 - row2 can I could use at least conditions he same for 1000 lines and should not use the features of lead and lag


Thank you

It if self explaining IMHO

with data as (
select 9 r from dual union all
select 7 from dual union all
select 6 from dual union all
select 3 from dual
)
, rdata as (
select r, row_number() over (order by r desc) rn
from data
)

select
d1.r - nvl(d2.r, '0') res
from
rdata d1, rdata d2
where
d1.rn +1 =d2.rn(+)

RES
2
1
3
3

Concerning

Tags: Database

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    Hi all
    Please let me know the difference between LEAD and LAG even if both are functions. Analytics, where we can use specific to improve performance.

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    concerning
    PRAMOD

    Pramod salvation,

    pramod62917 wrote:
    Please let me know the difference between LEAD and LAG

    The main difference is in which way is 'research ':
    -Lead will "transfer" in respect of the order by clause
    -Lag goes "back" with regard to the order by clause

    See this example (Basic):

    Scott@my11g SQL>ed
Wrote file afiedt.buf

  1  with t as (
  2  select 'TeamX' team, 1 player_id, 'PlayerA' name from dual
  3  union all select 'TeamX' team, 2 player_id, 'PlayerB' name from dual
  4  union all select 'TeamX' team, 3 player_id, 'PlayerC' name from dual
  5  union all select 'TeamX' team, 4 player_id, 'PlayerD' name from dual
  6  union all select 'TeamZ' team, 1 player_id, 'PlayerJ' name from dual
  7  union all select 'TeamZ' team, 2 player_id, 'PlayerK' name from dual
  8  union all select 'TeamZ' team, 3 player_id, 'PlayerL' name from dual
  9  -- end of sample data --
 10  )
 11  select
 12  team
 13  ,player_id current_play_id
 14  ,name current_name
 15  ,lead(name) over (partition by team order by player_id) next_name
 16  ,lag(name) over (partition by team order by player_id) prev_name
 17* from t
Scott@my11g SQL>/

TEAM  CURRENT_PLAY_ID CURRENT NEXT_NA PREV_NA
----- --------------- ------- ------- -------
TeamX               1 PlayerA PlayerB
TeamX               2 PlayerB PlayerC PlayerA
TeamX               3 PlayerC PlayerD PlayerB
TeamX               4 PlayerD         PlayerC
TeamZ               1 PlayerJ PlayerK
TeamZ               2 PlayerK PlayerL PlayerJ
TeamZ               3 PlayerL         PlayerK

7 rows selected.

    On the first line + (team = TeamX, current_play_id = 1) +, the next_name once PlayerA regarding the order given by +(order by player_id) + team +(partition by team) + playerB. For this line it is not prev_name like no player as an inferior player_id wihtin this team.
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  • to fill the gaps with value of lead and the delay and make average and the gap between earned

    Thanks in advance

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10001103N     3     1190001     WST     0.000     0.220     
10001103N     3     1190002     WST     0.220     0.440     
10001103N     3     1190003     WST     0.440     0.820     12800
10001103N     3     1190003     WST     0.820     1.180     12800
10001103N     3     1190004     WST     1.180     1.220     
10001103N     3     1190004     WST     1.220     1.300     
10001103N     3     1190005     WST     1.300     1.420     14800
10001103N     3     1190005     WST     1.420     1.550     14800
10001103N     3     1190006     WST     1.550     2.030     
10001103N     3     1190006     WST     2.030     2.660     
10001103N     3     1190007     WST     2.660     2.780     
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10001103N     3     1190001     WST     0.000     0.220     12800 ---> Lag value
10001103N     3     1190002     WST     0.220     0.440     12800 ---> Lag Value
10001103N     3     1190003     WST     0.440     0.820     12800
10001103N     3     1190003     WST     0.820     1.180     12800
10001103N     3     1190004     WST     1.180     1.220     13800 ---> Avg(12800,14800)
10001103N     3     1190004     WST     1.220     1.300     13800 ---> Avg(12800,14800)
10001103N     3     1190005     WST     1.300     1.420     14800
10001103N     3     1190005     WST     1.420     1.550     14800
10001103N     3     1190006     WST     1.550     2.030     14800 ---> Lead Value
10001103N     3     1190006     WST     2.030     2.660     14800 ---> Lead Value
10001103N     3     1190007     WST     2.660     2.780     14800 ---> Lead Value
    create table AVG_TABLE
(
  ID     VARCHAR2(20),
  TYPE   NUMBER,
  NUM    NUMBER,
  NAME   VARCHAR2(10),
  VALUE  NUMBER,
  BEG_MP NUMBER(6,3),
  END_MP NUMBER(6,3)
)
;

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insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190002, 'WST', null, .22, .44);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190003, 'WST', 12800, .44, .82);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190003, 'WST', 12800, .82, 1.18);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190004, 'WST', null, 1.18, 1.22);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190004, 'WST', null, 1.22, 1.3);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190005, 'WST', 14800, 1.3, 1.42);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190005, 'WST', 14800, 1.42, 1.55);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190006, 'WST', null, 1.55, 2.03);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190006, 'WST', null, 2.03, 2.66);
insert into AVG_TABLE (ID, TYPE, NUM, NAME, VALUE, BEG_MP, END_MP)
values ('10001103N', 3, 1190007, 'WST', null, 2.66, 2.78);
commit;

    Hello

    Use LEAD and LAG when you know exactly how far is the target line (for example, if you know the desired value is on the next row).
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(
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     ,     LAST_VALUE (value IGNORE NULLS) OVER (ORDER BY beg_mp)          AS prev_value
     ,     LAST_VALUE (value IGNORE NULLS) OVER (ORDER BY beg_mp DESC)     AS next_value
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)
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FROM       got_neighbors
ORDER BY  beg_mp to f
;

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