php - mysql queries - performance loss by putting numbers in quotes? -

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If a variable is always a number, is there a performance impairment by inserting it into invert commas?

For example 

  "select prod.product_name from prod.HD = prod.id = '$ id'";

No , you will not have any performance loss Inverted Take care of SKL injection by putting them inside a comma, but in such questions. Also keep in mind that performance means many things, you must be specific. Generally, it works fine.


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