I have one table in oracle 12c db where one column is varchar2 data type but the values are in DATE format. and by some mistake there are two different type of format mixed.
Basically i have to change the format there and make all values similar.
right format is "2018-11-21-02.57.26.00" but some values are like this : "11/21/2018 20:03:10.066414"
We need all values should be like right format. Need to prepare one update statement for this.
I have prepared the select statement like this. Create_TS should be updated as Create_TS_NEW only for those rows where CREATE_TS has '%/%'
I need to know if i can update those rows in table with Pseudo column like Create_TS_NEW
First Try to find out value with slash (/) then convert it into date format.
SELECT
CREATE_TS,
CASE WHEN INSTR(CREATE_TS,'/')>0 THEN TO_DATE(SUBSTR(CREATE_TS,1,19),'MM/DD/YYYY HH24:MI:SS')
ELSE TO_DATE(SUBSTR(CREATE_TS,1,19),'YYYY-MM-DD-HH24-MI-SS') end default_date_format,
to_char(CASE WHEN INSTR(CREATE_TS,'/')>0 THEN TO_DATE(SUBSTR(CREATE_TS,1,19),'MM/DD/YYYY HH24:MI:SS')
ELSE TO_DATE(SUBSTR(CREATE_TS,1,19),'YYYY-MM-DD-HH24-MI-SS') end,'YYYY-MM-DD-HH24-MI-SS') CREATE_TS_new
FROM Table_
Just put derived column in update statement that will enough to update the required format.
Update Table_ set create_ts=
to_char(CASE WHEN INSTR(CREATE_TS,'/')>0 THEN TO_DATE(SUBSTR(CREATE_TS,1,19),'MM/DD/YYYY HH24:MI:SS')
ELSE TO_DATE(SUBSTR(CREATE_TS,1,19),'YYYY-MM-DD-HH24-MI-SS') end,'YYYY-MM-DD-HH24-MI-SS') ;
Related
I have an Oracle table having col_date with different dates in it, i want to update my table based on below condition:
If col_date column has dates in 'MM/dd/yy' format then change the date to oracle date format as 'dd-MMM-yyyy' else update to null.
Tried below case condition:
select field1,
field2,
case
when Check_Date_Input like to_date(Check_Date_Input,'MM/dd/yy')
then date_format(to_date(Check_Date_Input, 'MM/dd/yy'), 'dd-MMM-yyyy')
else null
end as check_date
from Table
This query updates the date field to null in all case. Please guide to write correct case condition.
An Oracle date does not have specific format. It is stored in some internal format, that you don't really need to worry about. On the other hand, when displaying a date, Oracle builds a string representation of the date, that you are seeing in your output.
By default, the format is defined by nls parameter nls_date_format. You can change it to whatever you like by altering the database setting in your session, or by explicitely using to_char() in your query.
Say you want format dd-mmm-yyyy, then you can either do:
alter session set nls_date_format = 'dd-mm-yyyy';
And then run your query as:
select field1, field2, check_date_input from mytable
The nls setting remains acive for the life time of your session, so every date column will be displayed in that format in your resultsets.
Or, you can use to_char() within the query:
select field1, field2, to_char(check_date_input, 'dd-mm-yyyy') as check_date_input from mytable
I'm inserting data into a table and before inserting I need to check if data exists.
I have a composite key consisted of two columns of datetime and int.
Before inserting I need to check if the data with the same time and id exists in the table.
The date that user is inserting is in 'mm/dd/yyyy'.
The datetime data in the table looks like this: '2016-01-12 00:00:00.000'.
The id field is int.
So, I have a query:
if not exists(select count(*) from table_1 where MyDate = #myDate and id = #id)
insert into table_1 .....
What is the right way to format the date user sends to match the datetime format in the table?
Check this sqlfiddle about how to use different date formats in your query. Might help you to solve it.
http://www.sqlfiddle.com/#!2/fd0b7/5
I am guessing that the question is about SQL Server, based on the syntax. The issues in the code snippet far transcend date formats.
First, the expression:
if not exists(select count(*) from table_1 where MyDate = #myDate and id = #id)
will never return true, because the subquery always returns one row with one column. If nothing matches, the column contains 0, which does exist.
You intend:
if not exists(select 1 from table_1 where MyDate = #myDate and id = #id)
Second, this check is not necessary if you wisely choose to have the database enforce the uniqueness constraint. So, define a unique index or constraint on the two columns:
create unique index unq_table_1_id_mydate on table_1(id, MyDate);
Now, the database won't let you insert duplicate values and no if is necessary.
Next, I would suggest that you fix the date format at the application layer. YYYY-MM-DD is an ISO standard date format and quite reasonable. However, if you don't want to do that, use convert():
insert into table_1(id, MyDate, .....)
select #id, convert(datetime, #MyDate, 101), . . .
The value in the database looks to be correct stored as a date/time value, so this should work fine.
You can use following line to convert date to required format in SQL server:
select FORMAT(#your_date, 'yyyy-MM-dd HH:mm:ss', 'en-US') from Your_Table
I have a column in Oracle DB which is varchar2 data type. Typical value stored in this column is like 06/16/2015 02:14:18 AM.
I am trying to get all records wherein this column is having records after 1st August 2015.
select *
from MYTABLE
where to_date(substr(MYCOLUMN,1,10),'dd-mm-yyyy') > to_date('01-08-2015','dd-mm-yyyy');
But, I am getting ORA-01843. Where am I doing wrong?
Respect the format in your VARCHAR
....where to_date(substr(MYCOLUMN,1,10),'mm/dd/yyyy')
I have a column in Oracle DB which is varchar2 data type. Typical value stored in this column is like 06/16/2015 02:14:18 AM.
The first question is why do you store DATE as string? Using appropriate data type is one of the most important part of database design and performance.
Understand that DATE doesn't have the format you see, it is internally stored in 7 bytes which is Oracle's proprietary format. Storing date as a string to have a fixed format is not recommended.
I would suggest first fix the design so that you don't have to do this overhead activity while comparing dates. In the longer run it will help you.
1. Add a new column as DATE data type.
ALTER TABLE table_name
ADD new_column DATE;
2. Update the new column.
UPDATE table_name
SET new_column = TO_DATE(old_column, 'mm/dd/yyyy hh:mi:ss pm');
3. DROP the old column.
ALTER TABLE table_name
DROP COLUMN old_column;
4. Rename the new column to old column name.
ALTER TABLE table_name
RENAME COLUMN old_name to new_name;
Now, you could compare dates easily:
SELECT * FROM MYTABLE WHERE mycolumn > to_date('01-08-2015','dd-mm-yyyy');
This will also use any regular index on the date column.
From performance point of view:
If you don't fix it now, you will keep facing performance issues. Because the immediate fix of SUBSTR will not let you use any regular index, you need to create a function-based index.
If in your table all values like 06/16/2015 02:14:18 AM then you can use trunc(to_date(MYCOLUMN,'mm/dd/yyyy HH:mi:SS PM'),'dd') against to_date(substr(MYCOLUMN,1,10),'dd-mm-yyyy').
I'm in coldfusion working with data from an sql table, and using a query of queries to join the sql data to some data from an oracle database. Unfortunately, I need to order them by date, and the oracle table has two columns - DRWR_DATE which is of type DATE and TIME which is of type VARCHAR2. The two columns put into a string read 17-JUN-03 16:35:18 or something similar. I need to return these two columns as a TIMESTAMP so I can use query of queries to sort them.
Also, I think I read that a date column holds the time in Oracle anyway? I don't have much experience with Oracle so I am unsure how best to do this.
Try this:
SELECT to_timestamp(
to_char( drwr_date,'dd-mon-yy') ||' '|| time
, 'dd-mon-yy hh24:mi:ss'
)
FROM your_table
Try using TO_TIMESTAMP function:
SELECT TO_TIMESTAMP('17-JUN-03 16:35:18', 'DD-MON-RR HH24:MI:SS')
FROM DUAL;
you can try converting the column to date as the following:
TO_DATE(column,'DD-MON-YY HH24:MI:SS')
The first parameter takes your column and the second parameter specifies the date format that is used
If all you have to do is order by date, all you need is an order by clause.
order by drwr_date, time
You don't have to cast these to anything, unless you need to do so for another reason. Remember that a date datatype is essentially a floating point number. This, "17-JUN-03" is simply how your client is displaying it.
I'm using Oracle 11g Schema
I want to select the month and day from a date concatenate it and put it into a column.
The syntax I have here makes sense but its throwing an error of..
INSERT INTO OB_SELECT_LST12_SPG WED
VALUES (((TO_CHAR(TO_DATE('RET_DATE', MM))||( TO_CHAR(TO_DATE('RET_DATE', DD)));
"SQL Error: ORA-00907: missing right parenthesis"
Any help is greatly appreciated.
Thanks.
Some points first...
Your table name has a space in in
Your not enough columns error is caused by you having more than one column in the table
You really shouldn't be doing this at all
If ret_date is a column don't encapsulate it in quotation marks (') as you won't be able to convert the string 'ret_date' into a date.
However, assuming ret_date is a string that looks like 13-06-2012
insert into ob_select_lst12_spg_wed (my_column)
values(to_char(to_date(:ret_date,'dd-mm-yyyy'),'mmdd'));
If ret_date is a date data-type then you can remove the inner conversion.
insert into ob_select_lst12_spg_wed (my_column)
values(to_char(:ret_date,'mmdd'));
to_char and to_date both make use of datetime format models, which have a number of options.
Please don't do this though. Always store dates as dates
From your comments ret_date is a date and the column wed is a character. You're getting the error bind variable not declared because you haven't specified the variable. I'm going to assume that ret_date is in another table as it's a date, in which case lose the values key-word and insert directly from that table:
insert into ob_select_lst12_spg (wed)
select to_char(ret_date,'mmdd')
from the_other_table
This shouldn't be required though, you can always convert a date into whatever you want on exit from the database. If you don't store it as a date in the database then it's easy for errors and incorrect values to creep in. I personally would change the column wed to a date, in which case your query becomes the very simple:
insert into ob_select_list12_spg (wed)
select ret_date
from the_other_table
You can then use the correct datetime format model for your needs when selecting from the database.
Sample query to get date, month from date column:
Select ((To_Char(to_date('01-FEB-73','dd-mon-yy'), 'MM'))
||( To_Char(to_date('01-JAN-73','dd-mon-yy'), 'dd')))
from dual;
if RET_DATE is date datatype then use
insert into table_name (columname)
Select ((To_Char(RET_DATE, 'MM'))
||( To_Char(RET_DATE, 'dd')))
from dual;
You are missing extra parentheses. Number of opened ( was 8 and closed ) was 5
INSERT INTO OB_SELECT_LST12_SPG(WED)
VALUES ((TO_CHAR(TO_DATE(RET_DATE, MM)))||( TO_CHAR(TO_DATE(RET_DATE, DD))));
Update
Make sure other columns are not required (i.e. Allow NULLs)