mysql - select concat query

Question

I'm trying to list all users beginning with a letter, eg D

Would the following be the right method of doing this.

Select concat(firstname, '',lastname) from users where concat(lastname) = "D*"

Answer 1

SELECT concat(firstname, '',lastname) FROM users WHERE lastname LIKE "D%"

If you want to use wildcards, you need the LIKE operator. Also, in your where clause you only have one column (lastname), so you don't need concat .

Answer 2

我会尝试：

select * from users where lastname like 'D%';

Answer 3

For getting list starting with eg: "D":

SELECT concat(firstname, '',lastname) FROM users WHERE LEFT((concat(firstname, '',lastname)),1)= 'D';