why database show vulnerable column when i give a wrong parameter in query?

Published: 22/09/2019
why database show vulnerable column when i give a wrong parameter in query?
Source: SECURITY.STACKEXCHANGE.COM

When we try for inject a website for find vulnerable column then sometimes we need to give a wrong value in the website parameter. Like www.vhul-web.com/index.php?id=1 union select 1,2,3 -- - Now the vulnerable column not showing. www.vhul-web.com/index.php?id=-1 union select 1,2,3 -- - or www.vhul-web.com/index.php?id=.1 union select 1,2,3 -- - or www.vhul-web.com/index.php?id=1 having 0 union se

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