sql - How to extract only numbered rows from a column -

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for e.g: have column named "card no", varchar majority of rows contain numbers , few contains alphanumeric numbers. want ignore records not numbers.

below few examples same:

select cardno xx;

result:

cardno: _______ 1234, 5467, 1234/5467, abc 667, efg428

in above result set, want eliminate last 3 values. please advise.

select cardno xx translate(cardno, ' 0123456789', ' ') null

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