SyntaxFix

[mysql] using "if" and "else" Stored Procedures MySQL

you can use CASE WHEN as follow as achieve the as IF ELSE. 

SELECT FROM A a 
LEFT JOIN B b 
ON a.col1 = b.col1 
AND (CASE 
        WHEN a.col2 like '0%' then TRIM(LEADING '0' FROM a.col2)
        ELSE substring(a.col2,1,2)
    END
)=b.col2;

p.s:just in case somebody needs this way.

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