具有輸入和輸出SQL的存儲過程

Question

我正在嘗試制作一個存儲過程，該存儲過程采用名稱/數字並返回該名稱/數字的特定值

因此，在這段代碼中，我試圖編寫一個存儲過程，以使用公司名稱或cvr編號並返回該公司的遵從程度

    DROP DATABASE IF EXISTS DRCS;
    CREATE DATABASE DRCS;
    USE DRCS; 

    CREATE TABLE Companies ( 
            ID INT not null,
            Name varchar(255), 
            primary key (ID) 
    ); 

    CREATE TABLE CVR (
            ID INT not null,
            CVR_Number INT 
    ); 

    CREATE TABLE Compliance (
            ID INT not null,
            Complaince_level varchar(255)
    ); 

    CREATE TABLE GDPR (
            ID INT not null,
            GDPR_steps varchar(255) 
    ); 

                INSERT INTO Companies VALUES 
                (1, 'TDC'),
                (2, 'MAERSK'),
                (3, 'LEGO'), 
                (4, 'SAS'),
                (5, 'Carlsberg');

                INSERT INTO CVR VALUES 
                (11, '14773908'),
                (12, '32345794'),
                (13, '47458714'),
                (14, '56994912'),
                (15, '61056416');

                INSERT INTO Compliance VALUES 
                (21, '10%'),
                (22, '20%'),
                (23, '40%'),
                (24, '60%'),
                (25, '80%');

                INSERT INTO GDPR VALUES 
                (31, '1. Awareness'),
                (32, '2. Information you hold'),
                (33, '3. Communication privacy information'),
                (34, '4. Individuals rights'),
                (35, '5. Subject access requests'); 

#HERE MY PROBLEM STARTS                

    DELIMITER $$
        CREATE PROCEDURE DoC() 
        BEGIN 
        SELECT * FROM Companies , CVR, Compliance, GDPR; 

        END $$
    DELIMITER ;


    CALL DoC;

Answer 1

這四個表之間沒有關系！ 為所有表創建具有通用ID（例如id = 1,2,3,4）的行，然后進行聯接，然后嘗試列出要查看的字段。

將值插入（1，'TDC'），（2，'MAERSK'），（3，'LEGO'），（4，'SAS'），（5，'Carlsberg'）;

            INSERT INTO CVR VALUES 
            (1, '14773908'),
            (2, '32345794'),
            (3, '47458714'),
            (4, '56994912'),
            (5, '61056416');

            INSERT INTO Compliance VALUES 
            (1, '10%'),
            (2, '20%'),
            (3, '40%'),
            (4, '60%'),
            (5, '80%');

            INSERT INTO GDPR VALUES 
            (1, '1. Awareness'),
            (2, '2. Information you hold'),
            (3, '3. Communication privacy information'),
            (4, '4. Individuals rights'),
            (5, '5. Subject access requests'); 

從公司c，cvr v中選擇c.id，v.cvr_Number，其中c.id = v.id

同樣，通過加入id加入更多表。 您不需要為此的過程，也不是為此目的而設計的過程。

Answer 2

您可以對所有表進行聯合查詢。 但是所有對clomum計數的選擇查詢都應該相同。

DELIMITER $$
    CREATE PROCEDURE DoC() 
  SELECT A.id,A.name FROM
   ( SELECT id as id , name as name FROM Companies 
    UNION ALL
    SELECT id as id , name as name FROM CVR
    UNION ALL
    SELECT id as id , name as name FROM Compliance
    UNION ALL
    SELECT id as id , name as name FROM  GDPR) as A

  END $$
DELIMITER ;