sql db2 数据库

Question

Which date function use to convert date format YYYYMMDD TO DDMMYYYY

I am using db2 database please help me

Answer 1

假设你 column_with_date 是一个有效的日期列，如果你有 DB2 9.7，你可以使用

date(to_date(column_with_date,'DDMMYYYY')) 

Answer 2

You can use:

to_char(datecol,'DDMMYYYY')

just to display as DDMMYYYY

a date column doesn't have a format( not stored with a format within a DB table)

Answer 3

Assuming that your column's data type is VARCHAR, convert it to date and then format it to DDMMYYYY :

varchar_format((to_date(col, 'YYYYMMDD'), 'DDMMYYYY')

replace col with your column's name.
Or use substr() and concatenation:

substr(col, 7, 2) || substr(col, 5, 2) || substr(col, 1, 4) 

Answer 4

2 ways to do it that I can think of, already mentioned above but giving a real command so you can try it.

db2 "select to_char(current_date,'DDMMYYYY') from sysibm.sysdummy1"

or

db2 "select varchar_format(current_date,'DDMMYYYY') from sysibm.sysdummy1"