Query

可用

Successive-level queries over lists and associations

形式

Query[operator1, operator2, …]

验证过的示例Query[2] @ data → data[[2]]Query[Total, "a"] @ data → Total[Lookup[data, a]]Query[Select[#a < 5&], "b"] @ data → Lookup[Select[data, #a < 5 & ], b]选项

FailureAction — default "Abort"
MissingBehavior — default Automatic
PartBehavior — default Automatic

在 Qurak 上运行搜索参考

主题

Computation With Structured Datasets - Explicit Parts of Datasets
Computation With Structured Datasets - Custom Query Construction
New In100 Alphabetical Listing - Q

相关

Dataset Part FailureAction MissingBehavior PartBehavior All Association Function Keys List QuantityVariable Span

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