A foreign key is one or more data attributes that appear in one table that may be part of, or is coincidental with, the key of another table.
外键是在一张表中出现的一个或多个数据属性；它可以是另一张表的键的一部分，或者干脆碰巧就是另一张表的键。
Macro-data: Stock-Watson experimental coincidental leading and recession indexes;
总体资料库：Stock-Watson实验性领先及衰退指数；
Macro-data: Stock-Watson experimental coincidental leading and recession indexes;
总体资料库：Stock-Watson实验性领先及衰退指数；
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