postgresql 使用表连接left join巧妙优化not in关联子查询

某交通项目,tb_case 2万多条记录,tb_carout 1 使用原查询语句:  SELECT TB_CASE.CASENO AS CASENO,TB_CASE.LAWGROUP AS LAWGROUP,S1.ROLE_NAME AS LGNAME,TB_CASE.CARPARK AS CARPARK,S2.ROLE_NAME AS CARPARKNAME,TB_CASE.LAWTIME AS
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