Create christmas tree in SQL*PLUS

Summary 

Connect to sqlplus as sysdba 

 
sqlplus>set heading off;

SELECT DECODE(SIGN(FLOOR(maxwidth/2)-ROWNUM), 1, LPAD( ' ', FLOOR(maxwidth/2)-(ROWNUM-1)) 
|| RPAD( '*', 2*(ROWNUM-1)+1, ' *'), LPAD( '* * *', FLOOR(maxwidth/2)+3)) "CHRISTMAS TREE"
FROM all_objects, (SELECT 40 AS maxwidth FROM DUAL) 
WHERE ROWNUM < FLOOR(maxwidth/2) + 5;

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