SQL：根据列后面显示的行设置列值

我正在创建一种动态web表单，用户可以在其中拖放字段来创建自己的表单。元素通过标题进行分组，标题作为H类型存储在表中。在下表中，有两个组，1-4和5-6

如果字段的RLS_标志是用户可以设置的Y，则要求该字段以最终形式出现。但是，类型H元素的RLS_标志的值是根据同一组中的任何字段是否已设置为Y而自动确定的

将只有一个p类型的元素，给定该元素的序列号，我需要找到同一组中的所有行，检查其中是否有任何行的RLS_标志设置为Y，并设置组头的RLS_标志

我提出了下面的查询，但我确信这是最糟糕的查询，我需要一些优化查询的建议

UPDATE TABLE_NAME SET RLS_FLAG = 'Y' WHERE EXISTS (
    SELECT 1 FROM TABLE_NAME WHERE RLS_FLAG = 'Y' 
    AND SEQUENCE > ( SELECT COALESCE ( MAX( SEQUENCE ), 0 ) FROM TABLE_NAME WHERE TYPE = 'H' AND SEQUENCE < ( SELECT SEQUENCE FROM TABLE_NAME WHERE TYPE = 'P'))
    AND SEQUENCE < ( SELECT COALESCE ( MIN( SEQUENCE ), 999 ) FROM TABLE_NAME WHERE TYPE = 'H' AND SEQUENCE > ( SELECT SEQUENCE FROM TABLE_NAME WHERE TYPE = 'P'))
)

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在上面的语句中，我试图找到p上方的H元素序列和p下方的H元素序列。然后找到两个值之间的所有行，并检查其中是否有任何行的RLS_标志设置为Y

，下面是表示逻辑的另一种方式：

update t
    set rls_flag = 'Y'
    where type = 'H' and
          exists (select 1
                  from (select t2.*,
                               lead(case when type = 'H' then sequence end) over (order by sequence) as next_h_sequence
                        from t t2
                       ) t2
                  where t2.rls_flag = 'Y' and
                        t2.sequence >= t.sequence and t2.sequence < next_h_sequence
                 );

update t
    set rls_flag = 'Y'
    where type = 'H' and
          exists (select 1
                  from (select t2.*,
                               lead(case when type = 'H' then sequence end) over (order by sequence) as next_h_sequence
                        from t t2
                       ) t2
                  where t2.rls_flag = 'Y' and
                        t2.sequence >= t.sequence and t2.sequence < next_h_sequence
                 );