选择计数内部联接两个数据库

Question

我想显示按国家/地区分类的所有供应商信息，包括当月提供的名称数量。

这是两个数据库及其变量：

1。供应商：供应商ID，供应商名称，国家/地区，ReliabilityScore，ContactInfo

2.SuppliedName：SnID，Suppliedname1，语言，状态，标准，PlaceID，SupplierID，Supplieddate

这是我想出的并没有真正起作用的内容：

SELECT COUNT(DISTINCT SuppliedName.suppliedname1), Supplier.(*) FROM SuppliedName 
INNER JOIN Supplier ON Supplier.SupplierID = SuppliedName.SupplierID
WHERE EXTRACT(MONTH FROM SuppliedName.Supplieddate)=EXTRACT(MONTH FROM sysdate) AND EXTRACT(YEAR FROM SuppliedName.Supplieddate)=EXTRACT(YEAR FROM sysdate)
ORDER BY Supplier.Country;

请帮助！！！谢谢！

Answer 1

我想您只是错过了GROUP BY中所有列的SUPPLIER。

SELECT COUNT(DISTINCT SUPPLIEDNAME.SUPPLIEDNAME1),
       SUPPLIER.SUPPLIERID,
       SUPPLIER.SUPPLIEDNAME,
       SUPPLIER.COUNTRY,
       SUPPLIER.RELIABILITYSCORE,
       SUPPLIER.CONTACTINFO
       FROM SUPPLIEDNAME
            INNER JOIN SUPPLIER
                       ON SUPPLIER.SUPPLIERID = SUPPLIEDNAME.SUPPLIERID
       WHERE EXTRACT(MONTH FROM SUPPLIEDNAME.SUPPLIEDDATE) = EXTRACT(MONTH FROM SYSDATE)
             AND EXTRACT(YEAR FROM SUPPLIEDNAME.SUPPLIEDDATE) = EXTRACT(YEAR FROM SYSDATE)
       GROUP BY SUPPLIER.SUPPLIERID,
                SUPPLIER.SUPPLIEDNAME,
                SUPPLIER.COUNTRY,
                SUPPLIER.RELIABILITYSCORE,
                SUPPLIER.CONTACTINFO
       ORDER BY SUPPLIER.COUNTRY;