How to upload data from previous year if this year's data is unavailable

How to upload data from previous year if this year's data is unavailable

TABLE : TEST

TABLE : TEST

Batch   Year    Value
----------------------
A   2014    11
A   2015    0
A   2016    22
A   2017    0
A   2018    13
B   2015    10
B   2016    0
B   2017    29
B   2018    0
C   2013    24
C   2014    0
D   2015    27
D   2016    0

Herein batchwise suppose data is not there in 2015 it should take data from 2014, similarly if data is unavailable in a particular year for a particular batch then data from the previous year should be allocated to that year.

I tried to put case statement by taking only batch A but the problem is that my query is showing subquery return multiple rows.

SELECT BATCH, YEAR,
(CASE WHEN VALUE = 0 THEN
(SELECT A.VALUE FROM TEST A, TEST B WHERE A.YEAR = B.YEAR-1 AND A.VALUE <> '0') ELSE VALUE END)
FROM TEST;

Required Output table:

Test

Batch   Year    Value
---------------------
A   2014    11
A   2015    11
A   2016    22
A   2017    22
A   2018    13
B   2015    10
B   2016    10
B   2017    29
B   2018    29
C   2013    24
C   2014    24
D   2015    27
D   2016    27


sql oracle

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