1.列出两个表的数据 select * from [AAA]..Table1 a inner join [BBB]..Table2 b on a.id1 = b.id2 2.只BBB表里的数据 Select * from [BBB]..Table2 b where b.id2 in(Select a.id1 from [AAA]..Table1 a) AAA和BBB是数据库名 数据库名和表名之间放两个点

跨数据库查表： SELECT * FROM dbo.drp_SEOrder CROSS JOIN dbo.drp_SEOrderEntry CROSS JOIN clicksun_cuye.dbo.SEOrder CROSS JOIN clicksun_cuye.dbo.SEOrderEntry CROSS JOIN clicksun_yingxiao.dbo.SEOrder CROSS JOIN clicksun_yingxiao.dbo.SEOrderEntry 跨数据库比较销售订单： SELECT dbo.drp_SEOrder.sales_order_code AS DRP_FBillNo, dbo.drp_SEOrder.Fdate AS Fdate, clicksun_cuye.dbo.SEOrder.FBillNo AS cuye_FBillNo, clicksun_yingxiao.dbo.SEOrder.FBillNo AS yingxiao_FBillNo, dbo.drp_SEOrder.Fqty_all, dbo.drp_SEOrder.Fqty_all_c, dbo.drp_SEOrder.Fcost_all, dbo.drp_SEOrder.Fcost_all_c, dbo.drp_SEOrderEntry.product_code, dbo.drp_SEOrderEntry.product_name, dbo.drp_SEOrderEntry.product_spec, dbo.drp_SEOrderEntry.FQty, dbo.drp_SEOrderEntry.FUnit_name, dbo.drp_SEOrderEntry.FAllAmount, dbo.drp_SEOrderEntry.FAllAmount_c, dbo.drp_SEOrderEntry.FAuxTaxPrice, dbo.drp_SEOrderEntry.FAuxTaxPrice_c, clicksun_cuye.dbo.SEOrderEntry.FQty AS cuye_FQty, clicksun_cuye.dbo.SEOrderEntry.FAuxTaxPrice AS cuye_FAuxTaxPrice, clicksun_cuye.dbo.SEOrderEntry.FAllAmount AS cuye_FAllAmount, clicksun_yingxiao.dbo.SEOrderEntry.FQty AS yingxiao_FQty, clicksun_yingxiao.dbo.SEOrderEntry.FAuxTaxPrice AS yingxiao_FAuxTaxPrice, clicksun_yingxiao.dbo.SEOrderEntry.FAllAmount AS yingxiao_FAllAmount, clicksun_cuye.dbo.SEOrder.FStatus AS cuye_FStatus, clicksun_cuye.dbo.SEOrder.FCancellation AS cuye_FCancellation, clicksun_yingxiao.dbo.SEOrder.FStatus AS yingxiao_FStatus, clicksun_yingxiao.dbo.SEOrder.FCancellation AS yingxiao_FCancellation FROM clicksun_yingxiao.dbo.SEOrder RIGHT OUTER JOIN clicksun_cuye.dbo.SEOrder RIGHT OUTER JOIN dbo.drp_SEOrder LEFT OUTER JOIN clicksun_cuye.dbo.SEOrderEntry RIGHT OUTER JOIN dbo.drp_SEOrderEntry ON clicksun_cuye.dbo.SEOrderEntry.FInterID = dbo.drp_SEOrderEntry.FInterID_c AND clicksun_cuye.dbo.SEOrderEntry.FEntryID = dbo.drp_SEOrderEntry.FEntryID_c LEFT OUTER JOIN clicksun_yingxiao.dbo.SEOrderEntry ON dbo.drp_SEOrderEntry.FInterID = clicksun_yingxiao.dbo.SEOrderEntry.FInterID AND dbo.drp_SEOrderEntry.FEntryID = clicksun_yingxiao.dbo.SEOrderEntry.FEntryID ON dbo.drp_SEOrder.sales_order_code = dbo.drp_SEOrderEntry.sales_order_code ON clicksun_cuye.dbo.SEOrder.FInterID = dbo.drp_SEOrder.FInterID_c ON clicksun_yingxiao.dbo.SEOrder.FInterID = dbo.drp_SEOrder.FInterID WHERE (dbo.drp_SEOrder.status = 1)