定义QlikView中的系统字段
在Settings - User Preferences里面有一个“Show System Fields”的选项。是否勾选这个选项后，再新建List Box的时候就可以选择系统字段。否则不能。那如何定义系统字段呢。 如下代码所示： vcD4KPHByZSBjbGFzcz0="brush:sql;">SET HidePrefix = _;TableB:LO
在Settings -> User Preferences里面有一个“Show System Fields”的选项。是否勾选这个选项后，再新建List Box的时候就可以选择系统字段。否则不能。那如何定义系统字段呢。
如下代码所示：喎?http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHByZSBjbGFzcz0="brush:sql;">SET HidePrefix = "_";
TableB:
LOAD * Inline [
Test1, Test2, Test3, _Test4
1, 2, 3, t
2, 3, 4, e
3, 4, 5, s
1, 5, 2, t
2, 6, 3, 4
3, 7, 4, _
];
在定义了 HidePrefix=”_”之后，所有字段名字以”_”为前缀的都会被视为系统字段。如下图所示，在新建List Box的时候，你将无法看到_Test4这个字段。
在User Preferences里面勾选”Show System Fields”之后，再新建List Box”_Test4”。这里要注意，此时对于系统字段”_Test4”中的任何选择值都不会出现在”Current Selections”里面。
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