mysql - 带有输入和输出 SQL 的存储过程

Question

我正在尝试制作一个存储过程，它采用名称/或数字并返回该名称/数字的特定值

因此，在这段代码中，我正在尝试编写一个存储过程，它采用公司名称或 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;

标签： mysqlsql

Answer 1

您可以对所有表进行联合查询。但是所有选择查询的clomum count 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 ;