Question

我正在尝试创建一个带有名称/号码的存储过程，并返回该名称/号码的特定值

所以在这段代码中，我正在尝试编写一个存储过程，它会获取公司名称或cvr编号并返回该公司的合规程度

    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

四张桌子之间没有任何关系！为所有表创建具有公共ID（如id = 1,2,3,4）的行，然后执行连接，然后尝试列出要查看的字段。

插入公司价值观（1，＆＃39; TDC＆＃39;），（2，＆＃39; MAERSK＆＃39;），（3，＆＃39; LEGO＆＃39;），（4，＆＃39; SAS＆＃39;），（5，＆＃39;嘉士伯＆＃39;）;

            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');

从公司c，cvr v中选择c.id，v.cvr_Number，其中c.id = v.id

同样通过加入id添加更多表。您不需要这样的程序，并且程序不是为此而设计的。

Answer 2

您可以使用所有表的联合查询。但所有选择的clomum计数查询应该是相同的。

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 ;

带输入和输出SQL的存储过程

2 个答案: