LAST_DAY, FIRST_DAY in DB2
Submitted by Vikram Khatri on Sat, 2008-01-26 01:14.
LAST_DAY(SYSDATE) ==> values (current date + 1 month) - day(current date +1 month) days
FIRST_DAY(SYSDATE) ==> values (current date - day(current date + 1 month) days) + 1 DAY