Php 在mysql中从3个表中选择不同的值

我有三张桌子，tbl_第一产品，tbl_第三产品和tbl_第四产品

每个表都有大小1、大小2、大小3、大小4、大小5列

例如，在tbl_first_产品中

在tbl_第三产品中

在tbl_第四产品中

我想合并所有这些表，得到不同的值，输出应该是

2026283023434344

是否有任何方法可以使用mysql和php获得此输出

我试了很多。但没有结果

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提前感谢。

您可以对每个字段进行并集，并选择与之不同的字段

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希望这有帮助。

以上代码正在运行。如何从结果中删除0。您可以使用WHERE Right？：

id    size1    size2    size3    size4    size5

1      38       40       42       43        44
2      28       30       32       34        40

id    size1    size2    size3    size4    size5

1      30       32       40        0        0
2      28       30       32       34        0

id    size1    size2    size3    size4    size5

1      20       26       40       44        0
2      28       30       32       34        40

SELECT DISTINCT value
    FROM
   (SELECT size1 AS value FROM tbl_first_product

    UNION

    SELECT size2 AS value FROM tbl_first_product

    UNION

    SELECT size3 AS value FROM tbl_first_product

    UNION

    SELECT size4 AS value FROM tbl_first_product

    UNION

    SELECT size5 AS value FROM tbl_first_product

    UNION

    SELECT size1 AS value FROM tbl_third_product

    UNION

    SELECT size2 AS value FROM tbl_third_product

    UNION

    SELECT size3 AS value FROM tbl_third_product

    UNION

    SELECT size4 AS value FROM tbl_third_product

    UNION

    SELECT size5 AS value FROM tbl_third_product

    UNION

    SELECT size1 AS value FROM tbl_fourth_product

    UNION

    SELECT size2 AS value FROM tbl_fourth_product

    UNION

    SELECT size3 AS value FROM tbl_fourth_product

    UNION

    SELECT size4 AS value FROM tbl_fourth_product

    UNION

    SELECT size5 AS value FROM tbl_fourth_product) T
    WHERE value <> 0