达梦数据库树查询（所有子节点包含自身节点）

 select * from tableName t
	start with t.pid = '2c948a836b4f94b4016b5000c386014b'
	or t.id = '2c948a836b4f94b4016b5000c386014b'
	connect by t.pid = prior t.id

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