#純靠北工程師4z0
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公司一段 SQL 是這樣寫的:
select top 1 t2.xxx
from (
巴拉巴拉一大串,看到眼花
) t1
left outer join t2
on t1.xx = t2.xx
where t2.xx = XXX
所以我說,前輩中間寫那一大串是在裝忙嗎?
select top 1 t2.xx
from t2
where t2.xx = XXX
結果一模一樣 @@
最近大前輩一直抱怨公司資料庫效能太差,我彷彿知道了什麼
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This Left join SQL tutorial will help you learn what is left join in SQL. You will also learn how Left join in SQL server works along with ... ... <看更多>