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Convert from hex to string

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Hello, Colleagues !

I have to transform string, encoded to hexadecimal to text, but if I try to
select encode('Qt is great!', 'hex'); I receive valid and correct results

517420697320677265617421

but if I try to select decode ('517420697320677265617421', 'hex'), I
receive the same string, such as
'\x517420697320677265617421, which way I have to do for valid convert
to/from hexadecimal ?

Thanks for attention.
-- 
Best regards,
Sincerely yours,
Yuriy Rusinov.


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