I have a column that is defined as a SET. For simplicity's sake,
let's say the column is defined as:
set_col SET ('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', .... 'Z')
After entering a few hundred rows, I know that some but not all
values of the SET have been used at least once. How can one work
out which values have been used at least once ?
Doing a SELECT DISTINCT(set_col) on the table might provide
something like this:
A,B,D
A,C,G,N,M,P
C,E,F,H,I,R,S
C,E,G,I
D,F
G,H,L,M,O
etc
But it then requires processing to work out which
values have been used at least once. It's not very
scalable.
Is there a method to retrieve a list of all the values
that have been used at least once ?
Thank you very much,
chas
ps. using an old version at the moment - 3.22.25
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