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Strings, or blocks of text, are put within single quotes to differentiate from the code. And two dashes indicate the start of a comment -- which is something that developers use to explain something to themselves and hence is not executed. A lot of developers do an unsafe practice of injecting (piecing together) the user input into the SQL statement they are building. And if you don't check your inputs from the user, they could have given you something that breaks your statement - something as simple as a single quote character anywhere in what they entered.

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