How do I use order by in mysql?

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I am using order by in select query
like

SQL

select emp_id,emp_nm from emp order by emp_id asc

but the problem is :produced result by query is:
emp_id | emp_nm
E1 | A
E10 | B
E11 | C
E2 | D
E3 | E
E4 | F

But, i want like this:
emp_id | emp_nm
E1 | A
E2 | B
E3 | C
E10 | D
E11 | E

Is it possible in sql?

What I have tried:

I am using order by in select query
like

select emp_id,emp_nm from emp order by emp_id asc

Posted 27-Dec-17 22:33pm

CodeEager

Updated 27-Dec-17 22:55pm

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OriginalGriff · Accepted Answer · 2017-12-27T22:55:00

That's because you are ordering by a string quantity, and string order is defined by the first different character between two strings. In your case, E2 comes after E1, E10, and E11 because the first different character is '2' in one string and '1' in the other: because '1' comes before '2' in the character set, all strings starting "E1" will come before all strings starting "E2" - the remaining characters are not considered at all.

You can't get round that, or not easily, because that is how strings work!
There are three things you can do:
1) Pad your ID's with leading zeros:

E01 | A
E10 | B
E11 | C
E02 | D
E03 | E
E04 | F

2) Use a computed column to give you a character prefix and an integer count: Generated Columns in MySQL 5.7.5 | MySQL Server Blog[^]
3) Write a function to split your ID, convert the numeric part to a number, and use that for ordering.
Me? I don't use "mixed" id's for this very reason!