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我已经解决这个问题很长时间了，我决定我会在我的脑袋爆炸之前询问是否有人可以提出一些建议。

这是我正在运行的查询，它只是在子查询中多次重复相同的子子查询。我想看看我必须有哪些替代选项来加快速度。

到目前为止，我所能想到的只是运行一个初始查询，然后插入第二个查询的结果。

提前感谢任何人花时间看这个。

SELECT t2.* FROM TABLEA as t2 where
t2.link_id in 
(
    select t4.LinkA as link_list from TABLEB as t4
    where t4.LinkB in (
        select t1.id from TABLEC as t1 where t1.number in
        (
            (select t2.number from TABLEC as t2 where t2.id in 
                (
                select t3.link_id from TABLEA as t3 where t3.an like "%20278%"
                )
            )
        )
    )
    union

    select t4.LinkB as link_list from TABLEB as t4
    where t4.LinkB in (
        select t1.id from TABLEC as t1 where t1.part_number in
        (
            (select t2.number from TABLEC as t2 where t2.id in 
                (
                select t3.link_id from TABLEA as t3 where t3.an like "%20278%"
                )
            )
        )
    )
    union


    select t4.LinkA as link_list from TABLEB as t4
    where t4.LinkA in (
        select t1.id from TABLEC as t1 where t1.number in
        (
            (select t2.number from TABLEC as t2 where t2.id in 
                (
                select t3.link_id from TABLEA as t3 where t3.an like "%20278%"
                )
            )
        )
    )
    union

    select t4.LinkB as link_idlist from TABLEB as t4
    where t4.LinkA in (
        select t1.id from TABLEC as t1 where t1.number in
        (
            (select t2.number from TABLEC as t2 where t2.id in 
                (
                select t3.link_id from TABLEA as t3 where t3.an like "%20278%"
                )
            )
        )
    )
)
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