Question

我对数据库查询不是很了解，但遇到错误

“如果SELECT DISTINCT是，则ORDER BY项目必须出现在选择列表中指定。”

带有以下查询。我在Google上进行搜索，发现如果使用Distinct，则该订单按需要分组，但仍然无法获取。谁能帮助我。

SELECT DISTINCT 
       P1.*
FROM T_PRD P1
     LEFT JOIN T_PRD P2 ON P1.baseprdid = P2.prdid
     INNER JOIN T_PRD_NM_VENDOR prdNmVendor ON P1.prdId = prdNmVendor.prdId
     INNER JOIN T_VENDOR_NM vendorNM ON prdNmVendor.vendorNMId = vendorNM.vendorNMId
     INNER JOIN T_NM nm ON vendorNM.NMId = nm.NMId
     INNER JOIN T_PRD_VENDOR prdVendor ON prdVendor.PRDId = P1.PRDId
     INNER JOIN T_VENDOR vendor ON prdVendor.vendorId = vendor.vendorId
     INNER JOIN T_CSTMR_PRD_REF custPrd ON custPrd.ProductId = P1.PRDId
     INNER JOIN T_CSTMR cstmr ON custPrd.ChennelCstrId = cstmr.cstmrid
WHERE 1 = 1
      AND P1.Lifecycle = 2
      AND P1.AutoCreated = 0
      AND vendor.vendorId = 1
      AND P1.VendorEnfId = 1
      AND cstmr.cstmrid = 2008
ORDER BY CASE
             WHEN P1.BASEPRDID = 0
             THEN P1.PRDNAME
             ELSE P2.PRDNAME
         END ASC, 
         BASEPRDID;

Answer 1

您的ORDER BY取决于SELECT DISTINCT列表中缺少的表达式。添加

 SELECT DISTINCT  P1.*
        ,CASE
             WHEN P1.BASEPRDID = 0
             THEN P1.PRDNAME
             ELSE P2.PRDNAME
         END col

SQL Server选择“排序依据不同

1 个答案: