Oracle:connect_by_isleaf
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select connect_by_isleaf isleaf,
tb.switch_type_id,
sys_connect_by_path(tb.package_id, '|') path,
tb.record_type,
tb.element_offset,
tb.element_length,
tb.element_encode_type,
tb.element_align,
tb.mask,
tb.asn_type
from (select b.switch_type_id,
b.package_id,
b.element_offset,
b.element_length,
b.element_encode_type,
nvl(b.element_align, 'L') element_align,
b.record_type,
nvl(b.mask, 'LH') mask,
b.asn_type,
b.switch_type_id || '|' || b.package_level || '|' || b.package_id level_child,
b.switch_type_id || '|' || (b.package_level - 1) || '|' || b.parent_package_id level_parent
from switch_asn_record b
) tb
start with tb.level_parent like '%|0|-1'
connect by prior tb.level_child = tb.level_parent;
1、connect_by_isleaf是否是子节点;
2、sys_connect_by_path(tb.package_id, '|') ==> |xxx|xxx|xxx
3、start with tb.level_parent like '%|0|-1' ==> 树的遍历以从什么开始
4、connect by prior tb.level_child = tb.level_parent; ==>此层遍历之后,再将child作为parent,继续往下遍历
tb.switch_type_id,
sys_connect_by_path(tb.package_id, '|') path,
tb.record_type,
tb.element_offset,
tb.element_length,
tb.element_encode_type,
tb.element_align,
tb.mask,
tb.asn_type
from (select b.switch_type_id,
b.package_id,
b.element_offset,
b.element_length,
b.element_encode_type,
nvl(b.element_align, 'L') element_align,
b.record_type,
nvl(b.mask, 'LH') mask,
b.asn_type,
b.switch_type_id || '|' || b.package_level || '|' || b.package_id level_child,
b.switch_type_id || '|' || (b.package_level - 1) || '|' || b.parent_package_id level_parent
from switch_asn_record b
) tb
start with tb.level_parent like '%|0|-1'
connect by prior tb.level_child = tb.level_parent;
1、connect_by_isleaf是否是子节点;
2、sys_connect_by_path(tb.package_id, '|') ==> |xxx|xxx|xxx
3、start with tb.level_parent like '%|0|-1' ==> 树的遍历以从什么开始
4、connect by prior tb.level_child = tb.level_parent; ==>此层遍历之后,再将child作为parent,继续往下遍历
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