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in mysql:

select 'a' = 'a     ';

return 1

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You're not the first to find this frustrating. In this case, use LIKE for literal string comparison:

SELECT 'a' LIKE 'a    ';    //returns 0

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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