在postgresql函数的两个日期之间获得结果

Question

我在Firebird中有这个过程。此存储过程显示的日期，我们给作为参数两个日期之间的名单：

CREATE PROCEDURE DIAS_ENTRE_FECHAS (
    first$date DATE, 
    last$date DATE) 
RETURNS (
    day$number INTEGEr, 
    day$name CHAR(10), 
    day$date DATE) 
AS 
DECLARE VARIABLE day$week INTEGER; 
begin 
    /* Procedure Text */ 

    day$date= FIRST$DATE; 
    day$number = 0; 

    while (day$date <= LAST$DATE) DO 
    begin 
      day$week=extract(weekday from day$date); 

      IF (day$week=0) THEN 
      day$name='DOMINGO'; 
      ELSE IF (day$week=1) THEN 
      day$name='LUNES'; 
      ELSE IF (day$week=2) THEN 
      day$name='MARTES'; 
      ELSE IF (day$week=3) THEN 
      day$name='MIERCOLES'; 
      ELSE IF (day$week=4) THEN 
      day$name='JUEVES'; 
      ELSE IF (day$week=5) THEN 
      day$name='VIERNES'; 
      ELSE IF (day$week=6) THEN 
      day$name='SABADO'; 

      day$number = day$number+1; 
      suspend; 

      day$date = day$date+1; 
    end 

末

我想翻译的火鸟过程中PostgreSQL的工作。

我的例子。我需要做的是：

SELECT * FROM Dias_Entre_Fechas(start_date, end_date) 

返回数据：

DAY$NUMBER DAY$NAME DAY$DATE 
-------------------------------------- 
1 MARTES 12/01/2010 
2 MIERCOLES 13/01/2010 
3 JUEVES 14/01/2010 
4 VIERNES 15/01/2010 

谢谢！ ^^

Answer 1

你不需要的功能，只是简单的SQL是不够的：

select row_number() over() as DAY$NUMBER, 
     case extract(dow from d) 
      when 0 then 'DOMINGO' 
      when 1 then 'LUNES' 
      when 2 then 'MARTES' 
      when 3 then 'MIERCOLES' 
      when 4 then 'JUEVES' 
      when 5 then 'VIERNES' 
      else 'SABADO' 
     end as DAY$NAME, 
     d as DAY$DATE 
from generate_series(date '2016-02-02', date '2016-03-03', interval '1' day) d 


day$number |day$name |day$date   | 
-----------|----------|--------------------| 
1   |MARTES |2016-02-02 00:00:00 | 
2   |MIERCOLES |2016-02-03 00:00:00 | 
3   |JUEVES |2016-02-04 00:00:00 | 
4   |VIERNES |2016-02-05 00:00:00 | 
5   |SABADO |2016-02-06 00:00:00 | 
6   |DOMINGO |2016-02-07 00:00:00 | 
7   |LUNES  |2016-02-08 00:00:00 | 
8   |MARTES |2016-02-09 00:00:00 | 
9   |MIERCOLES |2016-02-10 00:00:00 | 
10   |JUEVES |2016-02-11 00:00:00 | 
11   |VIERNES |2016-02-12 00:00:00 | 
12   |SABADO |2016-02-13 00:00:00 | 
13   |DOMINGO |2016-02-14 00:00:00 | 
14   |LUNES  |2016-02-15 00:00:00 | 
15   |MARTES |2016-02-16 00:00:00 | 
16   |MIERCOLES |2016-02-17 00:00:00 | 
17   |JUEVES |2016-02-18 00:00:00 | 
18   |VIERNES |2016-02-19 00:00:00 | 
19   |SABADO |2016-02-20 00:00:00 | 
20   |DOMINGO |2016-02-21 00:00:00 | 
21   |LUNES  |2016-02-22 00:00:00 | 
22   |MARTES |2016-02-23 00:00:00 | 
23   |MIERCOLES |2016-02-24 00:00:00 | 
24   |JUEVES |2016-02-25 00:00:00 | 
25   |VIERNES |2016-02-26 00:00:00 | 
26   |SABADO |2016-02-27 00:00:00 | 
27   |DOMINGO |2016-02-28 00:00:00 | 
28   |LUNES  |2016-02-29 00:00:00 | 
29   |MARTES |2016-03-01 00:00:00 | 
30   |MIERCOLES |2016-03-02 00:00:00 | 
31   |JUEVES |2016-03-03 00:00:00 | 

---

你说：

例如：
SELECT * FROM Dias_Entre_Fechas（起始， end_date）
返回数据：日期$ NUMBER天$名称日期$日期
-------------------------------- ------
1貂12/01/2010
2 MIERCOLES 13/01/2010
3 JUEVES 14/01/2010
4 VIERNES 15/01/2010

只要做到：

select row_number() over() as DAY$NUMBER, 
     case extract(dow from d) 
      when 0 then 'DOMINGO' 
      when 1 then 'LUNES' 
      when 2 then 'MARTES' 
      when 3 then 'MIERCOLES' 
      when 4 then 'JUEVES' 
      when 5 then 'VIERNES' 
      else 'SABADO' 
     end as DAY$NAME, 
     d::date as DAY$DATE 
from generate_series(date '2010-01-12', date'2010-01-15', interval '1' day) d 
; 

day$number |day$name |day$date | 
-----------|----------|-----------| 
1   |MARTES |2010-01-12 | 
2   |MIERCOLES |2010-01-13 | 
3   |JUEVES |2010-01-14 | 
4   |VIERNES |2010-01-15 |