Command Line Technology Question Closure

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SELECT
    TagOfInterest,
    NumClosed,
    NumQuestions,
    NumClosed * 100.0 / NumQuestions AS PercentClosed
FROM (
    SELECT
        TagOfInterest,
        COUNT(CASE WHEN ClosedDate IS NOT NULL THEN 1 END) AS NumClosed,
        COUNT(*) AS NumQuestions
    FROM (
        SELECT
            CASE
                WHEN LOWER(Tags) LIKE '%<powershell>%' THEN '[powershell]'
                WHEN LOWER(Tags) LIKE '%<bash>%' THEN '[bash]'
                WHEN LOWER(Tags) LIKE '%<cmd>%' THEN '[cmd]'
            END AS TagOfInterest,
            ClosedDate
        FROM Posts
        WHERE
            PostTypeId = 1 -- Questions
            AND (
                LOWER(Tags) LIKE '%<powershell>%'
                OR LOWER(Tags) LIKE '%<bash>%'
                OR LOWER(Tags) LIKE '%<cmd>%'
            )
    ) CommandLineQuestions
    GROUP BY TagOfInterest
) CountsByTag

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