Question

我正在使用SQLPLUS并且确实需要能够使用IF/THEN/ELSE，但我无法找到有关如何使其工作的任何信息。（消息人士都说不能这样做），所以我试图用CASE来做同样的事情。我需要查看sysdate，如果它在日期A和日期B之间，则运行Select语句。如果它没有转到下一个CASE语句。以下是我正在尝试做的事情：

CASE  
    WHEN sysdate BETWEEN TO_DATE('28/08/2016', 'DD/MM/YYYY') AND TO_DATE('20/11/2016', 'DD/MM/YYYY')
      THEN
         (SELECT 
          schools.abbreviation,
          students.entrydate,
          students.lastfirst as Student,
          students.student_number,
          students.grade_level,
          courses.course_name,
          teachers.lastfirst as Teacher,
          pgfinalgrades.grade,
          round(pgfinalgrades.percent) as Percent,
            (CASE
                WHEN ps_customfields.getcf('Students', students.ID, 'zz_B_Soccer') = '1'
                THEN 'Boys_Soccer'
            ELSE NULL 
          END) AS "Athletic Sport - Fall"
FROM pgfinalgrades
    JOIN sections on pgfinalgrades.sectionid = sections.id
    JOIN courses on upper(sections.course_number) = upper(courses.course_number)
    JOIN cc on pgfinalgrades.studentid = cc.studentid and sections.id = cc.sectionid and sysdate between cc.dateenrolled and cc.dateleft
    JOIN students on pgfinalgrades.studentid = students.id
    JOIN prefs on prefs.name = 'curfgname-S' || sections.schoolid and pgfinalgrades.finalgradename = to_char(substr(prefs.value, 1,2))
    JOIN terms on terms.schoolid = sections.schoolid and sysdate between terms.firstday and terms.lastday and terms.isyearrec = 1
    JOIN schools on sections.schoolid = schools.school_number
    JOIN teachers on sections.teacher = teachers.id
WHERE students.enroll_status = 0
  AND sysdate between cc.dateenrolled and cc.dateleft
  AND (pgfinalgrades.grade = 'C-'
    OR pgfinalgrades.grade = 'D'
    OR pgfinalgrades.grade = 'D-'
    OR pgfinalgrades.grade = 'E'
    OR pgfinalgrades.grade = 'F'
    )
  AND --Fall Sports
    (       ps_customfields.getcf('Students', students.ID, 'zz_B_Soccer') IS NOT NULL
         OR ps_customfields.getcf('Students', students.ID, 'zz_B_Cross_Country') IS NOT NULL
         OR ps_customfields.getcf('Students', students.ID, 'zz_Golf') IS NOT NULL  
    ));

接下来是冬季运动，然后是春季运动。我在sysdate行上收到错误“unknown command”，然后运行每个case。我不知道如何让它抓住今天的日期，确定它属于哪种情况，然后运行那个让我输出。我打算将其自动化，在整个学年中每周运行一次，并且不希望每年多次触摸它。如果有人能想到更好的方法来做到这一点，我全都听见了。 :)

Answer 1

我正在使用SQLPLUS，确实需要能够使用 IF / THEN / ELSE，但我无法找到有关如何的任何信息我可以让它工作。（Sources all say it can't be done）

我想说这在PLSQL匿名块中可以很好地完成，我们可以使用IF/ELSE语句。请参阅breif演示：

begin
   if sysdate between to_date ('28/08/2016', 'DD/MM/YYYY')
                  and to_date ('20/11/2016', 'DD/MM/YYYY')
   then
      dbms_output.put_line ('Sysdate is beteeween the date range');
   ---You can run your sql query here
   else
      dbms_output.put_line ('Not in date range');
   ---You can run your sql query here

   end if;
end;

输出

Not in date range

PL/SQL procedure successfully completed.

sqlplus select语句里面的情况

1 个答案: