from a in F020s
join b in B030s on a.B03001 equals b.B03001 join b in B030s on a.B0300
阅读背景：
join子句中一个表达式的类型不正确.类型推理在对“Join”的调用中失败.
来源：互联网
from a in F020s
join b in B030s on a.B03001 equals b.B03001 join b in B030s on a.B0300
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