Get previous id

Hi folks,
Please help me on below. This is an example to my requirement. I need to get extra column 'PREV_ITEM_CD' which has the previous value of 'ITEM_CD' column
Thank you
{code}
with t as(
select 10 as id,1123 as item_cd,201301 as month_id from dual union all
select 10 as id,1124 as item_cd,201301 as month_id from dual union all
select 10 as id,1125 as item_cd,201301 as month_id from dual union all
select 10 as id,1126 as item_cd,201302 as month_id from dual union all
select 10 as id,1127 as item_cd,201302 as month_id from dual union all
select 10 as id,1128 as item_cd,201303 as month_id from dual union all
select 10 as id,1128 as item_cd,201303 as month_id from dual union all
select 10 as id,1129 as item_cd,201304 as month_id from dual union all
select 10 as id,1130 as item_cd,201304 as month_id from dual
select * from t
ID ITEM_CD MONTH_ID
10 1123 201301
10 1124 201301
10 1125 201301
10 1126 201302
10 1126 201302
10 1128 201303
10 1131 201303
10 1129 201304
10 1129 201304
i need to get output -one more column as item_cd_prev as below (please assume 1122 will be previous value)
ID ITEM_CD ITEM_CD_PREV MONTH_ID
10 1123 1122  201301
10 1124 1122  201301
10 1125 1122  201301
10 1126 1125  201302
10 1126 1125  201302
10 1128 1126  201303
10 1131 1128  201303
10 1129 1131  201304
10 1129 1131  201304
{code}

Hi,
How do you get the results you want?  Is month_id always an integer?  What role (if any) does the id column play in this problem?  Are the results you posted really what you want from the given sample data?  (The value 1131 does not appear in the WITH clause, but it does appear in the output.)
Depending on your answers:
WITH got_month_high_item_cd AS
    SELECT  id, item_cd, month_id
    ,       MAX (item_cd) OVER ( PARTITION BY  month_id
                                  ,            id  -- Maybe
                               )   AS month_high_item_cd
    FROM    t
--  WHERE ...      -- If you need any filtering, put it here
SELECT    id, item_cd
,         NVL ( LAST_VALUE (month_high_item_cd)
                     OVER ( PARTITION BY  id     -- Maybe
                            ORDER BY      month_id
                            RANGE BETWEEN UNBOUNDED PRECEDING
                                  AND     1         PRECEDING
              , 1122
              )  AS item_cd_prev_month
,         month_id
FROM      got_month_high_item_cd
ORDER BY  id -- Maybe
,         month_id
,         item_cd
Output from the sample data you posted (without 1131):
        ID    ITEM_CD ITEM_CD_PREV_MONTH   MONTH_ID
        10       1123               1122     201301
        10       1124               1122     201301
        10       1125               1122     201301
        10       1126               1125     201302
        10       1127               1125     201302
        10       1128               1127     201303
        10       1128               1127     201303
        10       1129               1128     201304
        10       1130               1128     201304

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