SELECT Table1."Customer ID",
CONCAT(CONCAT(CONCAT('FY ',Table1."Period1"), ' to FY '), Table2."Period1") AS "YEAR_PERIOD",
ROUND(((Table1."SALES" - Table2."SALES")/Table2."SALES") * 100, 2) AS "PERCENT",
Table1."NEW COLUMN"
FROM
(SELECT "Customer ID", TO_NUMBER(SUBSTR("Period1", 3, 4))...