Solved

converting string to date

Posted on 2014-01-27
9
329 Views
Last Modified: 2014-01-28
dear all
i have one table having 2 tables
period  varchar2   ,  
pay_date  date

period storing values of periods like this format
'01 - 2005'    ( to refer to jan 2005)
pay date is empty
how i would update all pay_date to be last date of the month
if period = '01 - 2005'  then pay_date = '31-jan-05'

thanx
0
Comment
Question by:NiceMan331
  • 5
  • 3
9 Comments
 
LVL 73

Accepted Solution

by:
sdstuber earned 500 total points
Comment Utility
update yourtable set pay_date = last_day(to_date(period,'mm - yyyy'))
0
 

Author Comment

by:NiceMan331
Comment Utility
it is ok for a single raw
but when i update all , it return with error
not a valid month
how do i check if one raw is out of the said format ?
0
 

Author Comment

by:NiceMan331
Comment Utility
in other word
let update the fileds which has correct format , then we will see the null value to correct it
0
 
LVL 73

Expert Comment

by:sdstuber
Comment Utility
select * from yourtable where not regexp_like(period,'[0-9]{2} - [0-9]{4}')
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 34

Expert Comment

by:johnsone
Comment Utility
That regular express will only check if it is numeric, not if it is a valid month.  For example, this has one valid row and one invalid:

WITH t (period) 
     AS (SELECT '01 - 2014' 
         FROM   dual 
         UNION ALL 
         SELECT '13 - 2014' 
         FROM   dual) 
SELECT * 
FROM   t 
WHERE  NOT Regexp_like(period, '[0-9]{2} - [0-9]{4}') 

Open in new window


However, the invalid row will not be returned.

The way that I would do this is with a PL/SQL block, trap the error and ignore the row with the bad date.  Will be slower, but will get around the problem.  Alternately,  you could write a function that was a couple of lines long to check for a valid date and use that to find valid records.
0
 
LVL 73

Expert Comment

by:sdstuber
Comment Utility
you're right, it's not specific enough, but I figured it would probably point in the right direction.

To be precise though, this should work

select * from yourtable where not regexp_like(period,'(0[1-9]|1[012]) - [0-9]{4}')
0
 
LVL 73

Expert Comment

by:sdstuber
Comment Utility
really though, this "how to find invalid data" should be a new question anyway
0
 

Author Comment

by:NiceMan331
Comment Utility
thanx for both
i got the invalid data in another way
the period was updated its value from table containing all periods values
so , select * from my_table where period not in (select period from period_table)
then it done
an execuse from johnson , i have to accept the solution of sdstubar with full thanx
is it fare for you ?

really though, this "how to find invalid data" should be a new question anyway

shall i open a new question for it ?
0
 
LVL 73

Expert Comment

by:sdstuber
Comment Utility
you've already gotten your answer so don't bother now
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
ORACLE SQL DEVELOPER Query ? 5 56
Salary Amount Format 13 56
levels for reporting 5 47
query in Oracle forms Builder 2 25
How to Unravel a Tricky Query Introduction If you browse through the Oracle zones or any of the other database-related zones you'll come across some complicated solutions and sometimes you'll just have to wonder how anyone came up with them.  …
This post first appeared at Oracleinaction  (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself). I  will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
Via a live example show how to connect to RMAN, make basic configuration settings changes and then take a backup of a demo database
This video shows how to configure and send email from and Oracle database using both UTL_SMTP and UTL_MAIL, as well as comparing UTL_SMTP to a manual SMTP conversation with a mail server.

728 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now