How to make a datatable with ngFor

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I'm working on a project in angular, what I should do is create a datatable with data obtained from a Firebase database, the data I get correctly in this way:

the problem that I have that when creating the datatable I make an ngFor to fill it with the data obtained and fill it without problem in this way: , the table fills up correctly but appears as if it has no data , I would like to know what I am doing wrong or how I solve it.

    
asked by Jose Campos 31.10.2017 в 17:23
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Well, what you are doing is filling the table with an ngfor, and I do not say that it is wrong but it will always come out that you do not have data because you never refer to that data in the table, you only fill the columns and rows, I recommend you use the following package: link

    
answered by 31.10.2017 в 20:25
does not the alert of the following variables show me only shows the first selected data? Error: Variable auxi is already defined in method main (String [])