MySQL - Select only numeric values from varchar column

Question

Consider the following table :

create table mixedvalues (value varchar(50));

insert into mixedvalues values 
('100'),
('ABC100'),
('200'),
('ABC200'),
('300'),
('ABC300'),
('400'),
('ABC400'),
('500'),
('ABC500');

How can I write a select statement that would only return the numeric values like

100
200
300
400
500

SQLFiddle

Solution 1

SELECT * 
FROM mixedvalues 
WHERE value REGEXP '^[0-9]+$';

Solution 2

SELECT * 
FROM mixedvalues 
WHERE concat('',value * 1) = value;

Reference: Detect if value is number in MySQL

Solution 3

You were close :

SELECT * 
FROM mixedvalues 
WHERE value > 0;

SQLFiddle

Solution 4

SELECT * FROM mixedvalues 
WHERE value > 0 
ORDER BY CAST(value as SIGNED INTEGER) ASC

Solution 5

List item has string continue with numbers

$string = "Test";

select * from table where columnname REGEXP "$string-*[0-9]+"; 

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