Hello All

Thankyou to Chris Perry, Butian Wang and Jacques Paris for their quick
replies.   It has solved my problem.
Chris Perry's response was:

I advise making a backup copy of your table first!

First of all, select the rows which have column_A as blank (Query > SQL
Select):

Select *
from TABLE
where column_A=""

You will return a table called selection which only has these records, now
use Table > Update Column to update this selection

Update table: Selection
Column to update: Column A
Update with: Column_B

Kind regards

Leo Bull
GTFP
Mt Gambier
South Australia
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