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I am in 10th class and this can come in my boards, please help me, I wanna know that if I have to use 3 underscores in front of A?? And can I just use 4 underscores if in the question the A is in 5th place?

What I have tried:

Nothing as I don't have a PC or a Laptop
Updated 9-Mar-23 22:26pm

'_' is SQL for "match any single character", and "%" is SQL for "Match any number of characters" So for A as fourth letter:
SELECT * FROM Employees WHERE EmpName LIKE '___A%'
And for A in the fifth letter:
SELECT * FROM Employees WHERE EmpName LIKE '____A%'
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as the underscore is '1' characters, the '%' is any length pattern.
where name like '___a%' // [ 4 '_' ]

"yes If 5 _ are needed, you can use them.
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Just for completeness and to offer an alternative, depending on platform and version of SQL you are using, you could also use
where substring(name, 4,1) = 'A';
This would be my preference as it is immediately apparent which character I am querying
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