如何在不希望字符串中第二个字母的情况下为mysql写一条select语句？

Question

I am trying to write a select statement for mysql where I want to exclude all strings that contain an 'a' as the second letter. Here is my select statement so far. It works for the most part, but some still slip through for reason I do not understand.

Select title, replacement_cost, rating from film where title not like "-a%" and replacement_cost = 19.99

Answer 1

Use the underscore as wildcard for a single character:

Select title, replacement_cost, rating 
from film 
where title not like "_a%" 
and replacement_cost = 19.99

SQL Wildcards

or with SUBSTR

Select title, replacement_cost, rating 
from film 
where SUBSTR(title, 2, 1) <> 'a'
and replacement_cost = 19.99

Answer 2

请尝试这个

Select title, replacement_cost, rating from film where substr(title,2,1)!='a' and replacement_cost = 19.99