How to identify columns as variables

[zarf (Andrew Plotkin)]

See this thread, which is basically the same question:

Random rows and columns in tables

Good morning, all: I am trying to choose random row in a table and then a random column associated with that row and then print that row/column combination. The following code below does not compile, I am just including it as an example of how I have tried to approach the problem. Actually, the first three lines compile just fine. Anyway, what I have is: carry out singing: choose a random row in the Table of Radio Songs; let N be the title entry; say "[N]"; choose a random column in th…