Check out example codes for "mysql in". It will help you in understanding the concepts better.

Code Example 1

SELECT 
    column1,column2,...
FROM
    table_name
WHERE 
	(expr|column_1) IN ('value1','value2',...);

Code Example 2

SELECT 
    column1,column2,...
FROM
    table_name
WHERE 
    column1 IN ('value1','value2',...);

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