One-by-one column entry in beamer table with \onslide crushes

I would like to have each column of the attached table appear in a staggered fashion.

\documentclass \usepackage \usepackage \usepackage \begin \begin[ht] \center \resizebox< \begin l>> \toprule & \multicolumn \\ & \multicolumn& \multicolumn& \multicolumn& \multicolumn& \multicolumn& \multicolumn \\ \cmidrule(r) \cmidrule(r) \textit & 12& & 44& & 54&$^$ & 34& & 94& & 0.1&$^$ \\ VAR2 & 0.034& & 0.033& & 0.062& & 0.030& & 0.040& & 0.088& \\ \cmidrule(r) \cmidrule(r) \textit & \multicolumn & \multicolumn \\ \textit: &\multicolumn & \multicolumn & \multicolumn&\multicolumn & \multicolumn & \multicolumn\\ \midrule FE1 & Y & & Y& & Y& & Y& & Y& & Y& \\ FE2 & Y & & Y& & Y& & Y& & Y& & Y& \\ $N$ & 8,340,000& & 8,340,000& & 8,340,000& & 8,340,000& & 8,340,000& & 8,340,000& \\ \bottomrule \multicolumn\\ \end> \end \end

I tried by using <\onslide<2->>rl ><\onslide<3->>rl ><\onslide<4->>rl ><\onslide<5->>rl ><\onslide<6->>rl ><\onslide<7->>rl> inside tabular option l> as suggested here but the outcome looks weird. Not all rows are rendered and I cannot see all the rules ( cmidrule , midrule , and bottomrule ). Could you please help me with it?