36 lines
1.5 KiB
Transact-SQL
36 lines
1.5 KiB
Transact-SQL
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-- =====================================================================
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-- 安全巡检：工程名称 = 监督巡视部位，移除冗余字段 PatrolLocation
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-- 背景：`监督巡视部位` 实际取自危大超危工程（HazardProjectName），
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-- 与 `工程名称` 为同一概念。PC 端/小程序均已下拉选择危大超危工程。
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-- 原表冗余保存 PatrolLocation，且其值恒等于 HazardProjectName。
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-- 影响：本脚本删除 dbo.HSSE_SafetyPatrol.PatrolLocation 列。
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-- 因该列历史值与 HazardProjectName 相同，删除不丢失有效信息。
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-- 执行前请先备份数据库。
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-- =====================================================================
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USE [SGGLDB]
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GO
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-- 1) 校验：该列是否与工程名称冗余（值均等于 HazardProjectName）；如返回 >0 请先人工确认
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SELECT COUNT(*) AS OTHERS
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FROM dbo.HSSE_SafetyPatrol
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WHERE ISNULL(PatrolLocation, '') <> ISNULL(HazardProjectName, '')
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-- 2) 动态删除该列上的默认值约束（如存在）
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GO
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DECLARE @df NVARCHAR(200)
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SELECT @df = dc.name
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FROM sys.default_constraints dc
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INNER JOIN sys.columns c ON c.object_id = dc.parent_object_id AND c.column_id = dc.parent_column_id
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WHERE dc.parent_object_id = OBJECT_ID('dbo.HSSE_SafetyPatrol') AND c.name = 'PatrolLocation'
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IF @df IS NOT NULL
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BEGIN
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EXEC(N'ALTER TABLE [dbo].[HSSE_SafetyPatrol] DROP CONSTRAINT [' + @df + N']')
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END
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-- 3) 删除冗余列
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GO
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ALTER TABLE [dbo].[HSSE_SafetyPatrol]
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DROP COLUMN [PatrolLocation]
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GO
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