使用一个查询更新一列中的多个字段

Question

UPDATE [Audit].[mfw].[Audit]
SET AuditObjectType = '200'
WHERE AuditObjectType = '30' AND Module = '23'

UPDATE [Audit].[mfw].[Audit]
SET AuditObjectType = '201'
WHERE AuditObjectType = '31' AND Module = '23'

UPDATE [Audit].[mfw].[Audit]
SET AuditObjectType = '202'
WHERE AuditObjectType = '32' AND Module = '23'

UPDATE [Audit].[mfw].[Audit]
SET AuditObjectType = '203'
WHERE AuditObjectType = '33' AND Module = '23'

我对 1 列有 4 个更新查询，但其中有多个字段，我想在一个查询中完成。我认为用 case 会很好，但不知道如何用模块管理该列，在这种情况下什么是常量值，它是 23。

update [Audit].[mfw].[Audit]
set AuditObjectType = (case AuditObjectType  
                           when '30' then '200'
                           when '31' then '201'
                           when '32' then '202'
                           when '33' then '203'
                           else AuditObjectType 
                           end)
WHERE Module = '23'

Answer 1

您的查询看起来没问题，但我建议不要更新多余的行：

UPDATE [Audit].[mfw].[Audit]
    SET AuditObjectType = (case AuditObjectType  
                               when '30' then '200'
                               when '31' then '201'
                               when '32' then '202'
                               when '33' then '203'
                               else AuditObjectType 
                           end)
WHERE Module = '23' AND AuditObjectType IN ('30', '31', '32', '33');

也就是说，我发现 VALUES() 可以更简洁，更不容易出错：

UPDATE [Audit].[mfw].[Audit]
    SET AuditObjectType = v.AuditObjectType
    FROM (VALUES ('23', '30', '200'),
                 ('23', '31', '201'),
                 ('23', '32', '202'),
                 ('23', '33', '203')
         ) v(Module, AuditObjectType, AuditObjectType)                    
WHERE Audit.Module = v.Module AND Audit.AuditObjectType = v.AuditObjectType

使用一个查询更新一列中的多个字段

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