sql - Why do I get a duplicate key error and what is this unique index []$[]$[]$? -

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When I tried to do a SQL query, I ended up with the following message:

< P> [] [] $ [] $ [] $ '

What does it mean? [] $ [] $ [] With unique index [] can not insert duplicate key line in item []? And what's made of '' [] $ [] $ [] $ '"?

You enter Can there be anything with the same primary key? It would be nice if you show us the code that executes it ... '[] $ [] $ [] $' -> I think it is your code

Try it 

  Choose yourtable * where your_primary_key = '[] $ [] $ [] $';

I'm just guessing because you have not provided the source code.


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