Different value counts on same column

Question

I am new to Oracle. I have an Oracle table with three columns: serialno, item_category and item_status. In the third column the rows h

Answer 1

You can either use CASE or DECODE statement inside the COUNT function.

  SELECT item_category,
         COUNT (*) total,
         COUNT (DECODE (item_status, 'serviceable', 1)) AS serviceable,
         COUNT (DECODE (item_status, 'under_repair', 1)) AS under_repair,
         COUNT (DECODE (item_status, 'condemned', 1)) AS condemned
    FROM mytable
GROUP BY item_category;

Output:

ITEM_CATEGORY   TOTAL   SERVICEABLE UNDER_REPAIR    CONDEMNED
----------------------------------------------------------------
chair           5       1           2               2
table           5       3           1               1