SQL将值从一个表列更新到另一个[重复]

Question

我有一个简单的选择语句来标识我要更新的行。基本上我想将 vad_description 复制到 vb_description 并且不能完全弄清楚这一点。任何帮助将不胜感激。

    SELECT
  variant_bom.vb_id
 ,variant_bom.vb_description
 ,variant_detail.vad_description
FROM dbo.variant_bom
INNER JOIN dbo.variant_detail
  ON variant_bom.vb_vad_id = variant_detail.vad_id
INNER JOIN dbo.variant_setting
  ON variant_setting.vas_vad_id = variant_detail.vad_id
WHERE variant_setting.vas_manufactured_variant = 1
AND variant_setting.vas_discontinued_product = 0

Answer 1

试试这样的

UPDATE vb
SET    vb.vb_description = vd.vad_description
FROM   dbo.variant_bom vb
       INNER JOIN dbo.variant_detail vd
               ON vb.vb_vad_id = vd.vad_id
       INNER JOIN dbo.variant_setting vs
               ON vs.vas_vad_id = vd.vad_id
WHERE  vs.vas_manufactured_variant = 1
       AND vs.vas_discontinued_product = 0 

为表命名 Alias 将使您的查询更具可读性