sql - 在oracle SQL中查询会计月份的天数

Question

该查询应返回当前会计月份的天数。检查以下查询：

SELECT *
FROM GL_PERIODS
WHERE PERIOD_SET_NAME='Fiscal Year'
AND period_year =(SELECT DISTINCT period_year
                                FROM gl_periods
                               WHERE     TRUNC (SYSDATE) BETWEEN start_date
                                                             AND end_date)

对于期间名称：SEP-19，Start_Date 是 8/26/2018。因此，sysdate 的天数应该是 16。

样本数据：

period_set_name    period_name    start_date    end_date   entered_period_name
Fiscal Year         AUG-19        7/29/2018    8/25/2018    AUG
Fiscal Year         SEP-19        8/26/2018    9/22/2018    SEP
Fiscal Year         OCT-19        9/23/2018    10/27/2018   OCT

预期产出：16

Answer 1

我们可以对日期进行算术运算。所以今天的会计日数将是：

SELECT (trunc(sysdate) - start_date) + 1 as fiscal_day_no
FROM GL_PERIODS
WHERE PERIOD_SET_NAME='Fiscal Year'
AND period_year =(SELECT DISTINCT period_year
                            FROM gl_periods
                           WHERE     TRUNC (SYSDATE) BETWEEN start_date
                                                         AND end_date)

这假设您没有特殊要求来处理例如周末或公共假期。

Answer 2

甲骨文设置：

CREATE TABLE GL_PERIODS(
  period_set_name VARCHAR2(20),
  start_date          DATE,
  end_date            DATE,
  period_name         CHAR(6) GENERATED ALWAYS AS ( CAST( TO_CHAR( end_date, 'MON-YY' ) AS CHAR(6) ) ) VIRTUAL,
  entered_period_name CHAR(3) GENERATED ALWAYS AS ( CAST( TO_CHAR( end_date, 'MON' ) AS CHAR(3) ) ) VIRTUAL,
  period_year         NUMBER(4) GENERATED ALWAYS AS ( EXTRACT( YEAR FROM end_date ) ) VIRTUAL
);

INSERT INTO GL_PERIODS( period_set_name, start_date, end_date )
  SELECT 'Fiscal Year', DATE '2018-07-29', DATE '2018-08-25' FROM DUAL UNION ALL
  SELECT 'Fiscal Year', DATE '2018-08-26', DATE '2018-09-22' FROM DUAL UNION ALL
  SELECT 'Fiscal Year', DATE '2018-09-23', DATE '2018-10-27' FROM DUAL;

查询：

SELECT TRUNC( SYSDATE - start_date + 1 ) AS fiscal_day_no
FROM   GL_PERIODS
WHERE  start_date <= SYSDATE
AND    SYSDATE < END_DATE + INTERVAL '1' DAY;

输出：

| FISCAL_DAY_NO |
|---------------|
|            20 |