Question

我有SELECT导出两个日期之间的销售信息（日期，数字）。

import cv2
import numpy as np

imgloc = 'path\Dosen_py.png'
img = cv2.imread(imgloc)
hight = np.shape(img)[0]
beam = np.zeros((hight,10,3))   

gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
gray_3_channel = cv2.cvtColor(gray, cv2.COLOR_GRAY2BGR)

horizontal = np.hstack((img,beam,gray_3_channel))

small = cv2.resize(horizontal, (0,0), fx=0.5, fy=0.5)  

cv2.imwrite("combi.png",small)

cv2.imshow("Combi",small)

cv2.waitKey()

但我想通过程序做到这一点。怎么做？我尝试过：

SELECT SALE_DATE, SALE_NUM
from SALES
where sale_date between '&fromdate' AND '&todate';

程序开始：

create or replace procedure SALE_DATES(var_saledate in SALES.SALE_DATE%TYPE)
AS
BEGIN
DECLARE Cursor c4 IS
SELECT SALE_DATE, SALE_NUM
from SALES
where sale_date = var_saledate AND var_saledate between '&fromdate' AND '&todate';
BEGIN FOR item IN c4

  LOOP
    DBMS_OUTPUT.PUT_LINE
     ('Date= ' || item.sale_date || ', Sale number: ' || item.sale_num);
  END LOOP;
  END;
  END;

我应该在括号中使用什么参数？

Answer 1

两个参数，以便您可以传递日期范围...我已经使用了更多标准命名约定，并且更清楚地说明了这一点。

CREATE OR REPLACE PROCEDURE get_sales
 (P_from_date  IN  DATE
 ,P_to_date    IN  DATE
 )
AS

  CURSOR C_get_sales
  IS
    SELECT
     s.sale_date
    ,s.sale_num
    FROM
     sales     s
    WHERE s.sale_date BETWEEN P_from_date AND P_to_date
  ;

BEGIN

  FOR R_this_sale IN C_get_sales LOOP

    DBMS_OUTPUT.PUT_LINE
     ('Date= ' || R_this_sale.sale_date || ', Sale number: ' || R_this_sale.sale_num)
    ;
  END LOOP;

END;

Answer 2

   SQL> set serveroutput on; -- for dbms_output.put_line to take effect

   SQL> CREATE OR REPLACE PROCEDURE SALE_DATES( v_sale_date_from 
   sales.sale_date%type,  v_sale_date_to sales.sale_date%type )
    AS
     Cursor c4 IS
     select SALE_DATE, SALE_NUM
       from SALES
      where sale_date between v_sale_date_from  AND v_sale_date_to ;
    BEGIN
    FOR item IN c4

      LOOP
        DBMS_OUTPUT.PUT_LINE ('Date= ' || item.sale_date || ', Sale number: ' || item.sale_num);
      END LOOP;
    END;/


    SQL> exec SALE_DATES(to_date('&dt1','dd.mm.yyyy'),to_date('&dt2','dd.mm.yyyy'));/ 
     -- assuming your nls_date_format is dd.mm.yyyy, when prompted enter 19.12.2017 as an example.

Oracle SQL。程序中的数据范围

2 个答案: