What is wildcard ?

Question

sql language

Answer 1

https://www.w3schools.com/sql/sql_wildcards.asp

Answer 2

Description of a wildcard:
A wildcard is kind of a placeholder for strings. You surely have seen the .* in a file system which displays all files when selected? The * is a wildcard there and represents 0, 1 or multiple characters. Therefore .txt, .dat, .DLL, .exe, ... (File extension possible) gets displayed when *.* is selected.

For wildcard symbols in SQL take a look here:
https://www.w3schools.com/sql/sql_wildcards.asp