在一行中显示出这个销售经理1～12月每月的销售数量:
SELECT SALES_MGR,
MAX(CASE MONTH WHEN 1 THEN SALES_AMT ELSE NULL END) AS JAN,
MAX(CASE MONTH WHEN 2 THEN SALES_AMT ELSE NULL END) AS FEB,
MAX(CASE MONTH WHEN 3 THEN SALES_AMT ELSE NULL END) AS MAR,
MAX(CASE MONTH WHEN 4 THEN SALES_AMT ELSE NULL END) AS APR,
MAX(CASE MONTH WHEN 5 THEN SALES_AMT ELSE NULL END) AS MAY,
MAX(CASE MONTH WHEN 6 THEN SALES_AMT ELSE NULL END) AS JUN,
MAX(CASE MONTH WHEN 7 THEN SALES_AMT ELSE NULL END) AS JUL,
MAX(CASE MONTH WHEN 8 THEN SALES_AMT ELSE NULL END) AS AUG,
MAX(CASE MONTH WHEN 9 THEN SALES_AMT ELSE NULL END) AS SEP,
MAX(CASE MONTH WHEN 10 THEN SALES_AMT ELSE NULL END) AS OTC,
MAX(CASE MONTH WHEN 11 THEN SALES_AMT ELSE NULL END) AS NOV,
MAX(CASE MONTH WHEN 12 THEN SALES_AMT ELSE NULL END) AS DEC,
FROM SALES
WHERE SALES_MGR=?
AND TEAR=?;