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Oracle表关联发散
2022-04-22 02:20:00 【CSDN问答】
表关联的数据发散怎么解决呢?三张表都几百条数据 一关联就将就二十万条数据了
采纳答案:
真正的业务中,一般联查都不超过两张表;
像这种三张表关联的,就把主表数据取出来,到内存处理好后,直接去关联表用条件查询就可以了
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