Question

我有两个工作的MySQL视图：

第一个视图选择表portfolio中的所有行，其中id也在表mural中。

CREATE 
    ALGORITHM = UNDEFINED 
    DEFINER = `root`@`localhost` 
    SQL SECURITY DEFINER
VIEW `view_mural` AS
    select 
        `portfolio`.`id`                    AS `id`,
        `portfolio`.`customer_id`           AS `customer_id`,
        `portfolio`.`location_id`           AS `location_id`,
        `portfolio`.`title_text_id`         AS `title_text_id`,
        `portfolio`.`description_text_id`   AS `description_text_id`,
        `portfolio`.`started`               AS `started`,
        `portfolio`.`finished`              AS `finished`,
    from
        `portfolio`
    where
        `portfolio`.`id` in (select 
                `mural`.`portfolio_id`
            from
                `mural`) WITH CASCADED CHECK OPTION

第二个视图从两个表中选择行：portfolio和mural。

CREATE 
    ALGORITHM = UNDEFINED 
    DEFINER = `root`@`localhost` 
    SQL SECURITY DEFINER
VIEW `view_mural` AS
    select 
        `portfolio`.`id`                                AS `id`,
        `portfolio`.`customer_id`                       AS `customer_id`,
        `portfolio`.`location_id`                       AS `location_id`,
        `portfolio`.`title_text_id`                     AS `title_text_id`,
        `portfolio`.`description_text_id`               AS `description_text_id`,
        `portfolio`.`started`                           AS `started`,
        `portfolio`.`finished`                          AS `finished`,
        (select 
            `mural`.`width` 
        from 
            `mural` 
        where 
            `mural`.`portfolio_id`=`portfolio`.`id`)    AS `mup`
    from
        `portfolio`

我无法得到，如何将这些组合成一个视图，选择表，两个表中的列，其中包含表组合中的行，其中id也在表壁画中。

当我添加：

    where
        `portfolio`.`id` in (select 
                `mural`.`portfolio_id`
            from
                `mural`) WITH CASCADED CHECK OPTION

到我的第二个视图的最后，它显示了一个错误：

Apply changes to view_mural Error 1368: CHECK OPTION on non-updatable view 'view_mural' SQL Statement:  CREATE       OR REPLACE ALGORITHM = UNDEFINED      DEFINER = `root`@`localhost`      SQL SECURITY DEFINER VIEW `view_mural` AS     select          `portfolio`.`id` AS `id`,         `portfolio`.`customer_id` AS `customer_id`,         `portfolio`.`location_id` AS `location_id`,         `portfolio`.`title_text_id` AS `title_text_id`,         `portfolio`.`description_text_id` AS `description_text_id`,         `portfolio`.`started` AS `started`,         `portfolio`.`finished` AS `finished`,         (select `mural`.`width` from `mural` where `mural`.`portfolio_id`=`portfolio`.`id`) AS `mup`     from         `portfolio`     where         `portfolio`.`id` in (select                  `mural`.`portfolio_id`             from                 `mural`) WITH CASCADED CHECK OPTION  Error when running failback script. Details follow. Error 1050: Table 'view_mural' already exists SQL Statement: CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `view_mural` AS select `portfolio`.`id` AS `id`,`portfolio`.`customer_id` AS `customer_id`,`portfolio`.`location_id` AS `location_id`,`portfolio`.`title_text_id` AS `title_text_id`,`portfolio`.`description_text_id` AS `description_text_id`,`portfolio`.`started` AS `started`,`portfolio`.`finished` AS `finished`,(select `mural`.`width` from `mural` where ((`mural`.`portfolio_id` = `portfolio`.`id`) and `portfolio`.`id` in (select `mural`.`portfolio_id` from `mural`))) AS `mup` from `portfolio`

有人能指出我该怎么办？

Answer 1

了解SQL joins：

SELECT
    portfolio.id,
    portfolio.customer_id,
    portfolio.location_id,
    portfolio.title_text_id,
    portfolio.description_text_id,
    portfolio.started,
    portfolio.finished,
    mural.width
FROM
    portfolio JOIN mural ON mural.portfolio_id = portfolio.id

将两个MySQL视图合并到一个视图中

1 个答案: