When I click "browse" my table of portfolio, there's a warning sign says

This table does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available. 

here's the picture:

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But in the table of "users", there is no such warning sign, and there's a area in the beginning of each row, with a checkbox of edit, copy, and delete.

enter image description here

What should I do to let my table of "portfolio" have the same checkbox in the beginning of each row as "users"?



You have to assign a PRIMARY column. In fact, there should be several primary columns for this table, because you don't need several rows with the same shares for one user. There is good explanation in courseware about this table.

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