如何在DB2中将LIKE运算符与另一个表中的值一起使用？

Question

I have the following SQL query

SELECT  
    CASE  
        WHEN TYPES LIKE '%Linux%' THEN 'LINUX'
        WHEN TYPES LIKE '%Windows%' THEN 'WINDOWS'
        ELSE 'UNKNOWN'  
    END AS COMP,  
COUNT(*) AS TOTAL


FROM  
    COMPUTERS.OS



GROUP BY  
    CASE  
        WHEN TYPES LIKE '%Linux%' THEN 'LINUX'
        WHEN TYPES LIKE '%Windows%' THEN 'WINDOWS'
        ELSE 'UNKNOWN'  
END

It works flawlessly, but I need to take values (Linux, Windows) to fill LIKE...THEN statement from another table? How can I achieve this?

Thank you!

Answer 1

You can use a join :

SELECT ot.comp, COUNT(*) AS TOTAL
FROM COMPUTERS.OS JOIN
     OtherTable ot
     ON types like ot.pattern
GROUP BY ot.comp;

This assumes that othertable has two columns, one is the pattern and the other is comp .