mysql - 联合选择不显示联合结果

Question

嘿伙计们，当我指定我的主要选择列名称时，我的查询不会返回我的联合结果，又名

SELECT inspection_number, region, report_date, 
inspection_type AS type, customer, customer_number, shipper, po
FROM reports
JOIN (
    (

        SELECT `key`, `report_key`, `shipper`, `po`, `commodity`, `label`, `status`
        FROM `berries`
    )
    UNION (

        SELECT `key`, `report_key`, `shipper`, `po`, `commodity`, `label`, `status`
        FROM `melons`
    )
    UNION (

        SELECT `key`, `report_key`, `shipper`, `po`, `commodity`, `label`, `status`
        FROM `citrus`
    )
    UNION (

        SELECT `key`, `report_key`, `shipper`, `po`, `commodity`, `label`, `status`
        FROM `table_grapes`
    )
    UNION (

        SELECT `key`, `report_key`, `shipper`, `po`, `commodity`, `label`, `status`
        FROM `tree_fruit`
    )
    UNION (

        SELECT `key`, `report_key`, `shipper`, `po`, `commodity`, `label`, `status`
        FROM `lot`
    )
) fruits ON inspection_number = fruits.report_key
WHERE fruits.status = '0' OR fruits.status = '1'
ORDER BY report_date DESC

不返回key、report_key、shipper、po、commodity 、标签或状态

运行异常

SELECT *
inspection_type AS type, customer, customer_number, shipper, po
FROM reports
JOIN ( -- etc.....

会吗？我该如何解决这个问题？

Answer 1

fruits 派生表确实包含提到的列，但在您的主要选择中您没有提及任何列；您只提到报告中的列 Inspection_number、region、report_date、inspection_type - 因此它只显示它们。

如果您想包含水果列，则需要在主选择语句中指定它们

即像这样:

SELECT inspection_number, region, report_date, 
inspection_type, key, report_key, shipper, po, commodity, label, status AS type, customer, customer_number, shipper, po, key, report_key, shipper, po, commodity, label, status
FROM reports
JOIN (