How to apply max function for each row in KDB?

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I want to ensure all values in column x are no smaller than 0.5, so I do:

update x:max (x 0.5) from myTable

But this gives (in Studio For KDB+)

An error occurred during execution of the query.
The server sent the response:
type
Studio Hint: Possibly this error refers to wrong type, e.g `a+1

What's wrong?

asked 56 secs ago

Milo Chen

1,219