I have the following Oracle Query that is converting todays date and the date field from the table into the same format. However, when trying to compare the two they aren't coming up as equal.
CAST(dstamp As Date), TO_DATE(CURRENT_DATE,'dd-MON-YY HH24.MI.SS','NLS_DATE_LANGUAGE = American')
The cast is used on the field in my table, both these return.
However, when adding the following where statement no rows are returned. I can't work out why these wouldn't be classed as equal?
WHERE CAST(dstamp As Date) = TO_DATE(CURRENT_DATE,'dd-MON-YY HH24.MI.SS','NLS_DATE_LANGUAGE = American');
Any help appreciated.
If you are trying to check if dstamp belongs to the current day, I would suggest:
where dstamp >= trunc(sysdate) and dstamp < trunc(sysdate) + 1
Athough a bit more verbose, this will be more efficient than applying a date function on the column being compared. Using a function on a column in a predicate makes the query non-SARGable, ie it cannot take advantage of an existing index.
The date is ALREADY a date. You don't need to convert it. You may need to remove the time component. Does this do what you want?
WHERE TRUNC(dstamp) = TRUNC(sysdate)
Related
I have a column called received_dt_key in Varchar in the format DD-MM-YYYY (e.g. 30-07-2021).
I would like to select all from the table for dates between 31-12-2021 and 01-01-2022. I have tried version of the below query and a blank table is the output.
SELECT *
FROM SD_BDAY
WHERE to_char(to_date(RECEIVED_DT_KEY, 'DD-MM-YYYY')) > to_char(to_date('31-12-2021', 'DD-MM-YYYY'))
and to_char(to_date(RECEIVED_DT_KEY, 'DD-MM-YYYY')) < to_char(to_date('01-01-2022', 'DD-MM-YYYY'));
Don't compare dates as strings. Compare them as dates:
SELECT *
FROM SD_BDAY
WHERE to_date(RECEIVED_DT_KEY, 'DD-MM-YYYY') > to_date('31-12-2021', 'DD-MM-YYYY')
and to_date(RECEIVED_DT_KEY, 'DD-MM-YYYY') < to_date('01-01-2022', 'DD-MM-YYYY');
If you try to compare them as strings then you are looking for string that is greater than '31-12-2021' and less than '01-01-2022' and the string comparison will look at the first character and see if it can find a match which is greater than '3' and less than '0'; there can never be such a match so it is quite correct that when comparing as strings nothing is returned.
As pointed out by #AlexPoole in comments, even if you compare the values as dates (rather than strings) you will still never return a result as finding values that are greater than DATE '2021-12-31' and less than DATE '2022-01-01' would return all dates from 2021-12-31 00:00:01 to 2021-12-31 23:59:59; however, your values will always be converted with a midnight time component and, therefore, will never fall into that range so cannot be returned.
What you probably want is to use >= rather than > and then it would match values on 2021-12-31.
The best thing would be to store calendar dates in date data type column. Why else do you think Oracle designed that data type? This way you may create normal indexes on data data type columns, or, if needed, partition the table by that date column.
Still, if you insist in having the calendar dates stored like that, I think the below should work:
SELECT *
FROM SD_BDAY
WHERE to_date(RECEIVED_DT_KEY, 'DD-MM-YYYY') >
to_date('31-12-2021', 'DD-MM-YYYY')
and to_date(RECEIVED_DT_KEY, 'DD-MM-YYYY') <
to_date('01-01-2022', 'DD-MM-YYYY');
Thus you compare calandar dates with calendar dates, not varchar with varchar, as it results from the code you have written.
And what if in the varchar2 column there is somethibng that can't be converted to date? That is why it is best to use the date data type.
I am not getting data between two years, below is between condition
to_char(Wfc.APPLYDTM,'MM/DD/YYYY') between '12/11/2019' and '01/10/2020'
but I am getting data between '12/11/2019' and '12/31/2019' & '01/11/2020' and '01/01/2020' for these dates but not between two different years.
Please help
Try using TO_DATE instead of TO_CHAR, and then compare against valid Oracle date literals:
SELECT *
FROM Wfc
WHERE TO_DATE(APPLYDTM, 'MM/DD/YYYY') BETWEEN date '2019-12-11' AND date '2019-01-10';
Note that if APPLYDTM already be a date, then you don't need to call TO_DATE on it. It doesn't make sense to convert your data to character, if you intend to work with it as a date.
You should convert your data to Date to be able to compare correctly.
The main idea is you should compare date value instead of string value.
to_date(Wfc.APPLYDTM,'MM/dd/yyyy') between to_date('12/11/2019','MM/dd/yyyy') and to_date('01/10/2020','MM/dd/yyyy')
Read here to more details.
Do not convert date/time values to strings! Use the built in functionality.
Your logic is most simply expressed as:
Wfc.APPLYDTMbetween >= DATE '2019-12-11' AND
Wfc.APPLYDTMbetween < DATE '2020-01-11'
Note that the date constants are provided using the DATE keyword. This supposed ISO 8601 standard date formats (happily!).
Also note the use of >= and < rather than BETWEEN. The date data type in Oracle can include a time component -- even if you don't see it when you query the table. This ensures that all date/times are included in the range.
As an added benefit, this can use an index on (APPLYDTMbetween). Using a function usually precludes using an index, unless you have defined a function-based index.
I have two columns which are both stored as 'MM/DD/YYYYY HH:MM:SS AM (or PM)'. I'm able to use 'TO_CHAR' to change it to 'MM/DD/YYYY' format, but after I get that, I only want the dates where both columns are not equal to each other (after the TO_CHAR). I used '!=' but this doesn't work and it still returns rows when both dates are equal to each other. I basically want the fields to ignore the times, and to only return the row if both dates are different.
Here was the query I was trying to run:
select r.project_name, to_char(r.created_on, 'MM/DD/YYYY'),
to_char(r.project_opened_on_date, 'MM/DD/YYYY')
from wh_project_repo r
where r.created_on != r.project_opened_on_date
Any help please?
It does not make sense to store dates as a string. But you are doing that.
Because you have strings, there is no need to convert to dates. How about doing:
select r.project_name, to_char(r.created_on, 'MM/DD/YYYY'),
to_char(r.project_opened_on_date, 'MM/DD/YYYY')
from wh_project_repo r
where substr(r.created_on, 10) <> substr(r.project_opened_on_date, 10)
The problem with your query, though, is that the manipulations are in the select. This does not affect what the where clause is comparing.
EDIT:
You could also compare the values as dates by doing:
where to_char(r.created_on, 'MM/DD/YYYY') <> to_char(r.project_opened_on_date, 'MM/DD/YYYY')
The issue isn't the string comparisons. The issue is that functions in the select don't affect the where.
I am trying to fetch the records which are having all time stamp columns.
I am using the following query to fetch the products that are created between the final date and (final date - 30) days, i.e products created during the last 30 days that fall in the 'final date' range.
I have products that are created on 30-OCT-2014. For the same products, the initiated date is 12-NOV-2014. However they are not being fetched when I using the below query.
SELECT A.ROW_ID,
A.PROD_NAME
FROM PROD A,
PROD_REL B
WHERE A.ROW_ID = B.PAR_ROW_ID
AND TO_DATE(A.CREATED_DT,'YYYY-MM-DD') BETWEEN (TO_DATE(B.FINAL_DATE,'YYYY-MM-DD') - 30)
AND (TO_DATE(B.FINAL_DATE,'YYYY-MM-DD'));
So, could you please let me know if I am missing something?
Here is a link to a SQLFiddle that demonstrates the problem.
… or just fix your format string TO_DATE(A.CREATED,'DD-MON-YYYY')
SQL Fiddle
Storing dates as DATE, is , of course, always a good starting point.
Since your data types are all dates, there is no need to use to_date. It's harmful, in fact, since to_date doesn't take a date as a parameter. Oracle has to do an implicit conversion from a date to a string, using your session's NLS_DATE_FORMAT which gets passed in to to_date and converted back to a date using the explicit format mask you specified. If the two conversions aren't using the same format mask, bad things happen.
Your WHERE clause just needs to be
AND a.created_dt BETWEEN b.final_date - 30
AND b.final_date
If I make that change, your SQLFiddle returns two rows
I've been tasked to take a calendar date range value from a form front-end and use it to, among other things, feed a query in a Teradata table that does not have a datetime column. Instead the date is aggregated from two varchar columns: one for year (CY = current year, LY = last year, LY-1, etc), and one for the date with format MonDD (like Jan13, Dec08, etc).
I'm using Coldfusion for the form and result page, so I have the ability to dynamically create the query, but I can't think of a good way to do it for all possible cases. Any ideas? Even year differences aside, I can't think of anything outside of a direct comparison on each day in the range with a potential ton of separate OR statements in the query. I'm light on SQL knowledge - maybe there's a better way to script it in the SQL itself using some sort of conversion on the two varchar columns to form an actual date range where date comparisons could then be made?
Here is some SQL that will take the VARCHAR date value and perform some basic manipulations on it to get you started:
SELECT CAST(CAST('Jan18'||TRIM(EXTRACT(YEAR FROM CURRENT_DATE)) AS CHAR(9)) AS DATE FORMAT 'MMMDDYYYY') AS BaseDate_
, CASE WHEN Col1 = 'CY'
THEN BaseDate_
WHEN Col1 = 'LY'
THEN ADD_MONTHS(BaseDate_, -12)
WHEN Col1 = 'LY-1'
THEN ADD_MONTHS(BaseDate_, -24)
ELSE BaseDate_
END AS DateModified_
FROM {MyDB}.{MyTable};
The EXTRACT() function allows you to take apart a DATE, TIME, or TIMESTAMP value.
You have you use TRIM() around the EXTRACT to get rid of the whitespace that is added converting the DATEPART to a CHAR data type. Teradata is funny with dates and often requires a double CAST() to get things sorted out.
The CASE statement simply takes the encoded values you suggested will be used and uses the ADD_MONTHS() function to manipulate the date. Dates are INTEGER in Teradata so you can also add INTEGER values to them to move the date by a whole day. Unlike Oracle, you can't add fractional values to manipulate the TIME portion of a TIMESTAMP. DATE != TIMESTAMP in Teradata.
Rob gave you an sql approach. Alternatively you can use ColdFusion to generate values for the columns you have. Something like this might work.
sampleDate = CreateDate(2010,4,12); // this simulates user input
if (year(sampleDate) is year(now())
col1Value = 'CY';
else if (year(now()) - year(sampleDate) is 1)
col1Value = 'LY'
else
col1Value = 'LY-' & DateDiff("yyyy", sampleDate, now());
col2Value = DateFormat(sampleDate, 'mmmdd');
Then you send col1Value and col2Value to your query as parameters.