Sql_Server中如何判断表中某列是否存在
/*判断表AA中是否存在AA_ID这一列，如果不存在，则新增*/IF NOT EXISTS (SELECT 1FROM syscolumns INNER JOIN sysobjects ON sysobjects.id = syscolumns.id
WHERE syscolumns.name = 'AA_ID' AND sysobjects.name = 'AA')
ALTER TABLE AA ADD AA_ID VARCHAR(30) NULL
GO
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