SQL Reference

DAYS

>>-DAYS--(--expression--)--------------------------------------><
 

The schema is SYSIBM.

The DAYS function returns an integer representation of a date.

The argument must be a date, timestamp, or a valid character string representation of a date or timestamp that is neither a CLOB nor a LONG VARCHAR.

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.

Examples:

• 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'.

    SELECT DAYS(PRENDATE) - DAYS(PRSTDATE)
      INTO :EDUCATION_DAYS
      FROM PROJECT
      WHERE PROJNO = 'IF2000'
  

  Results in EDUCATION_DAYS being set to 396 when using the sample table.

• 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'.

    SELECT SUM(DAYS(PRENDATE) - DAYS(PRSTDATE))
      INTO :TOTAL_DAYS
      FROM PROJECT
      WHERE DEPTNO = 'E21'
  

  Results in TOTAL_DAYS being set to 1584 when using the sample table.