Rewrite a sql query

Question

Hi All
i want to rewite the sql from
select x
from table1 t1
where y =
( select max(y) from table1 t2 where t1.id = t2.id )
to be more simple
i believe that analytic functions can do that
i tried
select x
from table1
having y = max(y) over()
but it did not work
any help please
thanks

Answer 1

thanks for all of you
i have rewriten the query , BUT the code did not become smaller , and i don't know which execution plan is better , any suggestions?
Old SQL:
SELECT scl1.claim_type,
scp.publisher_no,
scp.publisher_percentage,
sys.dual_claim_publisher_no,
effective_date
FROM song_claims scl1, song_claim_publishers scp, system_parameters sys
WHERE scl1.song_claim_no = scp.song_claim_no
AND scl1.song_no = 2
AND scl1.effective_date =
SELECT MAX(scl2.effective_date)
FROM song_claims scl2
WHERE scl2.song_no = 21
AND (scl2.effective_date <= '01-jan-2000'
OR scl2.effective_date =
SELECT MIN(scl3.effective_date)
FROM song_claims scl3
WHERE scl3.song_no = 2
Old SQL Execution Plan:
SELECT STATEMENT, GOAL = CHOOSE               Cost=8     Cardinality=1     Bytes=30
TABLE ACCESS BY INDEX ROWID     Object owner=CRS     Object name=SONG_CLAIM_PUBLISHERS     Cost=3     Cardinality=1     Bytes=10
NESTED LOOPS               Cost=8     Cardinality=1     Bytes=30
NESTED LOOPS               Cost=5     Cardinality=1     Bytes=20
TABLE ACCESS BY INDEX ROWID     Object owner=CRS     Object name=SONG_CLAIMS     Cost=3     Cardinality=1     Bytes=17
INDEX UNIQUE SCAN     Object owner=CRS     Object name=XAK1SONG_CLAIMS     Cost=2     Cardinality=1     
SORT AGGREGATE                    Cardinality=1     Bytes=12
FIRST ROW               Cost=3     Cardinality=1     Bytes=12
INDEX RANGE SCAN (MIN/MAX)     Object owner=CRS     Object name=XAK1SONG_CLAIMS     Cost=3     Cardinality=338621     
SORT AGGREGATE                    Cardinality=1     Bytes=12
FIRST ROW               Cost=3     Cardinality=1     Bytes=12
INDEX RANGE SCAN (MIN/MAX)     Object owner=CRS     Object name=XAK1SONG_CLAIMS     Cost=3     Cardinality=338621     
TABLE ACCESS FULL     Object owner=WISSYS     Object name=SYSTEM_PARAMETERS     Cost=2     Cardinality=1     Bytes=3
INDEX RANGE SCAN     Object owner=CRS     Object name=XPKSONG_CLAIM_PUBLISHERS     Cost=2     Cardinality=1     
New SQL:
select * from
SELECT scl1.claim_type,
scp.publisher_no,
scp.publisher_percentage,
sys.dual_claim_publisher_no,
scl1.effective_date,
max (effective_date) over (partition by null) max_eff_date,
min (effective_date) over (partition by null) min_eff_date
FROM song_claims scl1, song_claim_publishers scp, system_parameters sys
WHERE scl1.song_claim_no = scp.song_claim_no
AND scl1.song_no = 2
where
effective_date = case when max_eff_date <= '01-jan-2000' then to_char(max_eff_date)
when min_eff_date > '01-jan-2000' then to_char(min_eff_date)
else (SELECT to_char(MAX(effective_date)) FROM song_claims scl2 WHERE scl2.song_no = 2 and scl2.effective_date < '01-jan-2000')
end
New SQL Execution Plan:
SELECT STATEMENT, GOAL = CHOOSE               Cost=10     Cardinality=1     Bytes=69
VIEW     Object owner=BFH          Cost=10     Cardinality=1     Bytes=69
WINDOW BUFFER               Cost=10     Cardinality=1     Bytes=30
TABLE ACCESS BY INDEX ROWID     Object owner=CRS     Object name=SONG_CLAIM_PUBLISHERS     Cost=3     Cardinality=1     Bytes=10
NESTED LOOPS               Cost=8     Cardinality=1     Bytes=30
MERGE JOIN CARTESIAN               Cost=5     Cardinality=1     Bytes=20
TABLE ACCESS FULL     Object owner=WISSYS     Object name=SYSTEM_PARAMETERS     Cost=2     Cardinality=1     Bytes=3
BUFFER SORT               Cost=3     Cardinality=1     Bytes=17
TABLE ACCESS BY INDEX ROWID     Object owner=CRS     Object name=SONG_CLAIMS     Cost=3     Cardinality=1     Bytes=17
INDEX RANGE SCAN     Object owner=CRS     Object name=XAK1SONG_CLAIMS     Cost=2     Cardinality=1     
INDEX RANGE SCAN     Object owner=CRS     Object name=XPKSONG_CLAIM_PUBLISHERS     Cost=2     Cardinality=1     
SORT AGGREGATE                    Cardinality=1     Bytes=12
FIRST ROW               Cost=3     Cardinality=1     Bytes=12
INDEX RANGE SCAN (MIN/MAX)     Object owner=CRS     Object name=XAK1SONG_CLAIMS     Cost=3     Cardinality=338621     
Thanks