Double Hyphen/Dash in SQL-Injection. What are they used for? -


i'm learning how sql-injections work. on many teaching-websites there examples shown, such as

select fieldlist table field = 'x' , email null; --';

in field 'field' content thats going checked comes textfield or similar website. user-input in case x' , email null; -- use of -- ??

i saw few similar examples no explanation. missing fundamental?

ohh nevermind. -- used out-comment rest of query...


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