DAYS scalar function
The DAYS function returns an integer representation of a date.
The schema is SYSIBM.
- An expression that returns a value of one of the following built-in data types: a DATE, TIMESTAMP, or a valid character string representation of a date or timestamp that is not a CLOB. In a Unicode database, if a supplied argument is a graphic string (except DBCLOB), it is first converted to a character string before the function is executed.
The result of the function is a large integer. If the argument can be null, the result can be null; if the argument is null, the result is the null value.
The result is 1 more than the number of days from January 1, 0001 to D, where D is the date that would occur if the DATE function were applied to the argument.
- Example 1: Using the PROJECT table, set the host variable
EDUCATION_DAYS (int) to the number of elapsed days (PRENDATE - PRSTDATE)
estimated for the project (PROJNO) 'IF2000'.
Results in EDUCATION_DAYS being set to 396.
SELECT DAYS(PRENDATE) - DAYS(PRSTDATE) INTO :EDUCATION_DAYS FROM PROJECT WHERE PROJNO = 'IF2000'
- Example 2: Using the PROJECT table, set the host variable
TOTAL_DAYS (int) to the sum of elapsed days (PRENDATE - PRSTDATE)
estimated for all projects in department (DEPTNO) 'E21'.
Results in TOTAL_DAYS being set to 1584 when using the sample table.
SELECT SUM(DAYS(PRENDATE) - DAYS(PRSTDATE)) INTO :TOTAL_DAYS FROM PROJECT WHERE DEPTNO = 'E21'