How to write the query for year revenue and avg

Question

Hello Team
I have the table
create table sale (sale_id varchar2(32) not null, sale_epoch_microsec numeric(18,0)
      not null, sale_amount_cents numeric(18,0) not null, customer_id varchar2(32)
      not null, industry_id varchar2(32) not null, product_id varchar2(32) not null)The industry the customer is considered to be in can change from sale to sale. sale_epoch_microsec is microseconds since epoch; sale_amount_cents is the value of the sale in pennies.
The data in this is:
Insert into SALE
   (SALE_ID, SALE_EPOCH_MICROSEC, SALE_AMOUNT_CENTS, CUSTOMER_ID, INDUSTRY_ID,
    PRODUCT_ID)
Values
   ('s1', 200000000, 69985484589459, 'c1', 'i1',
    'p1');
Insert into SALE
   (SALE_ID, SALE_EPOCH_MICROSEC, SALE_AMOUNT_CENTS, CUSTOMER_ID, INDUSTRY_ID,
    PRODUCT_ID)
Values
   ('s2', 200000000, 69985484589459, 'c2', 'i2',
    'p2');
Insert into SALE
   (SALE_ID, SALE_EPOCH_MICROSEC, SALE_AMOUNT_CENTS, CUSTOMER_ID, INDUSTRY_ID,
    PRODUCT_ID)
Values
   ('s3', 6579000000, 6.99675342390895E16, 'c3', 'i3',
    'p3');
Insert into SALE
   (SALE_ID, SALE_EPOCH_MICROSEC, SALE_AMOUNT_CENTS, CUSTOMER_ID, INDUSTRY_ID,
    PRODUCT_ID)
Values
   ('s4', 6.5866459684979E17, 6.99675343454391E17, 'c4', 'i4',
    'p4');
      1.) SQL: Write the SQL query to determine, year-over-year, the total revenue and avg. per-product revenue from customers in the 'Gaming' industry.

Answer 1

josh1612 wrote:
As in the question it's mentioned that the date is in microseconds,
So i need the guidence to convert that to the date .Convert microseconds to seconds and then you may be able to use the function below which was found here:
http://www.oracle.com/technology/pub/articles/oracle_php_cookbook/fuecks_dates.html
CREATE OR REPLACE
    FUNCTION unixts_to_date(unixts IN PLS_INTEGER) RETURN DATE IS
         * Converts a UNIX timestamp into an Oracle DATE
        unix_epoch DATE := TO_DATE('19700101000000','YYYYMMDDHH24MISS');
        max_ts PLS_INTEGER := 2145916799; -- 2938-12-31 23:59:59
        min_ts PLS_INTEGER := -2114380800; -- 1903-01-01 00:00:00
        oracle_date DATE;
        BEGIN
            IF unixts > max_ts THEN
                RAISE_APPLICATION_ERROR(
                    -20901,
                    'UNIX timestamp too large for 32 bit limit'
            ELSIF unixts < min_ts THEN
                RAISE_APPLICATION_ERROR(
                    -20901,
                    'UNIX timestamp too small for 32 bit limit' );
            ELSE
                oracle_date := unix_epoch + NUMTODSINTERVAL(unixts, 'SECOND');
            END IF;
            RETURN (oracle_date);
    END;