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SQL code:
select * from numtable where (char_length('ºôÈëºÅÂë')>=7 and char_length(num)>=7 and substring('ºôÈëºÅÂë',char_length('ºôÈëºÅÂë')-6,7)=substring(num,char_length(num)-6,7)) or (char_length('ºôÈëºÅÂë')<7 and num='ºôÈëºÅÂë');
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