sql - PostgreSQL 选择两个日期之间的出勤

Question

我正在执行日期范围的出勤表报告：

Student  01.12 02.12 03.12 04.12 05.12 06.12
STUDENT1 TRUE  TRUE  TRUE  FALSE TRUE  FALSE
STUDENT2 TRUE  FALSE TRUE  TRUE  TRUE  TRUE

我的桌子：

id_
student_
date_
present_

Answer 1

我感到幸运。所以这是我对您可能会问的问题的猜测：

SELECT * FROM crosstab(
      $$SELECT student_, date_, present_
        FROM   tbl
        WHERE  date_ BETWEEN '2015-12-01'::date AND '2015-12-06'::date
        ORDER  BY 1,2$$

     ,$$SELECT unnest('{2015-12-01, 2015-12-02, 2015-12-03
                      , 2015-12-04, 2015-12-05, 2015-12-06}'::date[])$$)
AS ct ("Student" text, "01.12" bool, "02.12" bool, "03.12" bool
                     , "04.12" bool, "05.12" bool, "06.12" bool);

解释：

• PostgreSQL 交叉表查询