方案一
首先，取出来每行数据的最大时间（即最新时间），然后让原表数据和最大时间做右连接，得到的就是最新的数据。
SELECT
a0.*
FROM
t_score a0
RIGHT JOIN (
SELECT
max(ts) tsMax,
id
FROM
t_score
GROUP BY
id
) b0 ON a0.ts = b0.tsMax
AND a0.id = b0.id
方案二
方案二为方案一的变种，使用了exists 关键字来获取时间上最新的数据
SELECT
a0.*
FROM
t_score a0
WHERE
EXISTS (
SELECT
*
FROM
(
SELECT
max(ts) tsMax,
id
FROM
t_score
GROUP BY
id
) b0
WHERE
b0.tsMax = a0.ts
AND b0.id = a0.id
)
实战代码
把原来的整个表全部替换上去看效果用的（即：将你的查询sql替换“t_score”）
select *
from (SELECT
a0.*
FROM
(select rw.id, rw.rwmc, lcrz.hjmc, lc.lcslmc, lcrz.sjclsj
from WF_LCRZ lcrz, wf_lcsl lc, WF_RWSL rw
where lcrz.ZXRBH = '121409'
and lcrz.SJCLSJ >= '20220918000000'
and lcrz.LCSLBH = lc.ID
and lcrz.RWSLBH = rw.ID
and rw.lcslbh = lc.id
and rw.CLJG = '2'
and lc.lczt <= 2
and not exists (select id
from XM_ZBXM
where XM_ZBXM.ID = lc.ywbh
and lc.zlcbz = 0)
and not exists (select id from wf_rwfpsl where wf_rwfpsl.id=rw.rwfpbh and wf_rwfpsl.type=6) --不展示阅知环节
and exists (select id from wf_hjsl where wf_hjsl.lcslbh=lc.id and wf_hjsl.BZ = 0) --标志在用
and lcrz.hjmc is not null order by decode(lcrz.sjclsj, null, 0, lcrz.sjclsj) desc) a0
WHERE
EXISTS (
SELECT
*
FROM
(
SELECT
max(sjclsj) tsMax,
id
FROM
(select rw.id, rw.rwmc, lcrz.hjmc, lc.lcslmc, lcrz.sjclsj
from WF_LCRZ lcrz, wf_lcsl lc, WF_RWSL rw
where lcrz.ZXRBH = '121409'
and lcrz.SJCLSJ >= '20220918000000'
and lcrz.LCSLBH = lc.ID
and lcrz.RWSLBH = rw.ID
and rw.lcslbh = lc.id
and rw.CLJG = '2'
and lc.lczt <= 2
and not exists (select id
from XM_ZBXM
where XM_ZBXM.ID = lc.ywbh
and lc.zlcbz = 0)
and not exists (select id from wf_rwfpsl where wf_rwfpsl.id=rw.rwfpbh and wf_rwfpsl.type=6) --不展示阅知环节
and exists (select id from wf_hjsl where wf_hjsl.lcslbh=lc.id and wf_hjsl.BZ = 0) --标志在用
and lcrz.hjmc is not null order by decode(lcrz.sjclsj, null, 0, lcrz.sjclsj) desc)
GROUP BY
id
) b0
WHERE
b0.tsMax = a0.sjclsj
AND b0.id = a0.id
))
where rownum <= 4更改：Exists内容
select *
from (SELECT
a0.*
FROM
(select rw.id, rw.rwmc, lcrz.hjmc, lc.lcslmc, lcrz.sjclsj
from WF_LCRZ lcrz, wf_lcsl lc, WF_RWSL rw
where lcrz.ZXRBH = '121409'
and lcrz.SJCLSJ >= '20220918000000'
and lcrz.LCSLBH = lc.ID
and lcrz.RWSLBH = rw.ID
and rw.lcslbh = lc.id
and rw.CLJG = '2'
and lc.lczt <= 2
and not exists (select id
from XM_ZBXM
where XM_ZBXM.ID = lc.ywbh
and lc.zlcbz = 0)
and not exists (select id from wf_rwfpsl where wf_rwfpsl.id=rw.rwfpbh and wf_rwfpsl.type=6) --不展示阅知环节
and exists (select id from wf_hjsl where wf_hjsl.lcslbh=lc.id and wf_hjsl.BZ = 0) --标志在用
and lcrz.hjmc is not null order by decode(lcrz.sjclsj, null, 0, lcrz.sjclsj) desc) a0
WHERE
EXISTS (
SELECT
*
FROM
(SELECT
max(lcrz.sjclsj) tsMax,
lcrz.RWSLBH rwslbh
FROM
WF_LCRZ lcrz
GROUP BY
lcrz.RWSLBH
) b0
WHERE
b0.tsMax = a0.sjclsj
AND b0.rwslbh = a0.id
))
where rownum <= 4优化合并到原查询语句中：最后一个exists
select *
from (select rw.id, rw.rwmc, lcrz.hjmc, lc.lcslmc, lcrz.sjclsj
from WF_LCRZ lcrz, wf_lcsl lc, WF_RWSL rw
where lcrz.ZXRBH = '121409'
and lcrz.SJCLSJ >= '20220918000000'
and lcrz.LCSLBH = lc.ID
and lcrz.RWSLBH = rw.ID
and rw.lcslbh = lc.id
and rw.CLJG = '2'
and lc.lczt <= 2
and not exists (select id
from XM_ZBXM
where XM_ZBXM.ID = lc.ywbh
and lc.zlcbz = 0)
and not exists (select id from wf_rwfpsl where wf_rwfpsl.id=rw.rwfpbh and wf_rwfpsl.type=6) --不展示阅知环节
and exists (select id from wf_hjsl where wf_hjsl.lcslbh=lc.id and wf_hjsl.BZ = 0) --标志在用
and exists (select * from (select max(SJCLSJ) tsMax,RWSLBH from WF_LCRZ group by RWSLBH) te where lcrz.SJCLSJ = te.tsMax and te.RWSLBH=lcrz.RWSLBH)
and lcrz.hjmc is not null order by decode(lcrz.sjclsj, null, 0, lcrz.sjclsj) desc)
where rownum <= 4方案三
使用 row_number() over (parttion by 分组列 order by 排序列) 方式
SELECT
*
FROM
( SELECT *, row_number() over ( PARTITION BY id ORDER BY ts DESC ) num FROM t_score ) a0
WHERE
a0.num = 1