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DolphinDB如何查询某个symbol字段的所有取值

DolphinDB中想查询某个symbol字段的所有取值,应该怎么操作?


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可以用distinct(X)函数,返回向量 X 中不相同的元素,例如:

t=table(`a`b`c`a`b$SYMBOL as v);
select distinct(v) from t;

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