Get month and Date from Year in Oracle Database

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I am trying to get the date and month from Year entered by user.

Query I have used is:

SELECT trans_date FROM transactions WHERE (SUBSTR(trans_date,4,4) = 'June' AND TO_NUMBER(SUBSTR(trans_date,9,4)) = 2010); 

This is not working but if I do the same with DUAL table it works.

SELECT SUBSTR('22-June-2018', 4, 4) FROM DUAL;

What is the problem with it ?

Have you considered something like to_char()?

SELECT trans_date
FROM transactions
WHERE TO_CHAR(trans_date, 'YYYY-MM') = '2010-06';

Or better yet, proper date comparisons:

WHERE trans_date >= DATE '2010-06-01' AND
      trans_date < DATE '2010-07-01'

This has the advantage that the query can use an index on trans_date.

Oracle EXTRACT Function Demonstrated with Practical Examples, SELECT EXTRACT( YEAR FROM TO_DATE( '31-Dec-1999 15:30:20 ', 'DD-Mon-YYYY HH24:MI:SS' ) ) YEAR FROM DUAL; In this example, we used the TO_DATE() function to convert a date literal to a DATE value. To extract values of HOUR, MINUTE, and SECOND fields, you use TO_CHAR() function. This page provides you with the most commonly used Oracle date functions that help you handle date and time data easily and more effectively. Add a number of months (n) to a date and return the same day which is n of months away. Extract a value of a date time field e.g., YEAR, MONTH, DAY,

SELECT to_char(to_date(trans_date,'DD-Month-YYYY'),'DD') day,
       to_char(to_date(trans_date,'DD-Month-YYYY'),'Month') month
FROM transactions
WHERE to_char(to_date(trans_date,'DD-Month-YYYY'),'Month') = 'June' 
AND to_char(to_date(trans_date,'DD-Month-YYYY'),'YYYY') = '2010'); 

Oracle Sql get only month and year in date datatype, "FEB-2010" is not a Date, so it would not make a lot of sense to store it in a date column. You can always extract the string part you need , in  The DAY(), MONTH(), and YEAR() Functions. The most obvious way to return the day, month and year from a date is to use the T-SQL functions of the same name. Yes, T-SQL has functions built specifically for the purpose of returning these three dateparts. Here’s an example of how they work: DECLARE @date datetime2 = '2018-06-02 08:24:14.3112042'; SELECT DAY(@date) AS DAY, MONTH(@date) AS MONTH, YEAR(@date) AS YEAR; Result:

What is the problem with it ?

SUBSTR( string_value, start, length ) takes a string data type as the 1st argument. '22-June-2018' is not a DATE data type - it is a string data type (that just happens to contain characters that we recognise as a date); so using SUBSTR( '22-June-2018', 4, 4 ) works as expected.

trans_date is a DATE data type and not a string data type.

SUBSTR( trans_date, 4, 4 )

Involves an implicit conversion from a date to a string; so is effectively doing:

SUBSTR( TO_CHAR( trans_date ), 4, 4 )

Since, TO_CHAR( date_value, format_model ) needs to know how to format the DATE to a string, if you do not provide a second argument then it will use the NLS_DATE_FORMAT session parameter and the expression is effectively:

SUBSTR(
  TO_CHAR(
    trans_date
    ( SELECT value FROM nls_session_parameters WHERE parameter = 'NLS_DATE_FORMAT' )
  ),
  4,
  4
)

If the NLS_DATE_FORMAT session parameter does not match DD-Month-YYYY (or something equivalent where the 4-7th characters are month (which it would only be for 4-character month names) and 9th-12th characters are year (again, this would only be true for months with 4-character names) then your query will not work.

I am trying to get the date and month from Year entered by user.

Use EXTRACT:

SELECT trans_date
FROM   transactions
WHERE  EXTRACT( MONTH FROM trans_date ) = 6
AND    EXTRACT( YEAR  FROM trans_date ) = 2010

Use TO_CHAR( date_value, format_model ):

SELECT trans_date
FROM   transactions
WHERE  TO_CHAR( trans_date, 'Month' ) = 'June'
AND    TO_CHAR( trans_date, 'year'  ) = '2010'

Use date literals:

SELECT trans_date
FROM   transactions
WHERE  trans_date >= DATE '2010-06-01'
AND    trans_date < ADD_MONTHS( DATE '2010-06-01', 1 );

Use TRUNC( date_value, 'MM' ):

SELECT trans_date
FROM   transactions
WHERE  TRUNC( trans_date, 'MM' ) = DATE '2010-06-01';

Extract month and year from date in oracle, If the field is already a date column, you can simply cast it to the format you want: select ID_NO,CHECKED_DATE  The DATE data type stores the year (which includes the century), the month, the day, the hours, the minutes, and the seconds. It has a range from January 1, 4712 BCE through December 31, 9999 CE (Common Era, or ‘AD’). By default, Oracle uses CE date entries if BCE is not used explicitly.

How I extract month and year from date in oracle, You should try to replace: Hide Copy Code. select count(distinct TASK_START_DATE) from prof_tasks inner join prof_employee_data on  In these cases, Oracle Database returns UNKNOWN (see the examples that follow for additional information). The field you are extracting must be a field of the datetime_value_expr or interval_value_expr. For example, you can extract only YEAR, MONTH, and DAY from a DATE value.

Oracle EXTRACT (datetime) function, Extract date, time from a given datetime in Oracle If YEAR or MONTH is requested, then expr must evaluate to an DATE is not valid here because Oracle Database treats it as ANSI DATE datatype, which has no time fields. no, in your column you have a 7 byte piece of information that includes the century the year the month the day the hour the minute the second 4/1/2007 is a character string, you would use the format 'fmmm/dd/yyyy' to retrieve a date in that format, in that string - but the data isn't stored like that at all, it is binary and converted into a string using some format.

Oracle / PLSQL: EXTRACT Function, syntax and examples. The Oracle / PLSQL EXTRACT function extracts a value from a date or interval value. You can only extract YEAR, MONTH, and DAY from a DATE. You can only extract Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i  EXTRACT interprets expr as an ANSI datetime datatype. For example, EXTRACT treats DATE not as legacy Oracle DATE but as ANSI DATE, without time elements. Therefore, you can extract only YEAR, MONTH, and DAY from a DATE value. Likewise, you can extract TIMEZONE_HOUR and TIMEZONE_MINUTE only from the TIMESTAMP WITH TIME ZONE datatype.

Comments
  • What's the datatype of trans_date?
  • What are example values of trans_date?
  • May because of 2010 vs 2018?
  • If it is a string, (a) it shouldn't be, and (b) you'd need to find the start of the year more cleverly than that as month name lengths vary. I imagine you're replying on implicit conversion from date to string anyway though, in which case use Gordon's approach. Maybe your client is formatting the date values separately from your NLS settings, which could confuse things for you too; but it's still not a good way to do it.