如何检查 SQL Server 表中是否存在列? [英] How to check if a column exists in a SQL Server table?

问题描述

如果特定列不存在，我需要添加它.我有类似以下的内容，但它总是返回 false:

I need to add a specific column if it does not exist. I have something like the following, but it always returns false:

IF EXISTS(SELECT *
          FROM   INFORMATION_SCHEMA.COLUMNS
          WHERE  TABLE_NAME = 'myTableName'
                 AND COLUMN_NAME = 'myColumnName') 

如何检查 SQL Server 数据库的表中是否存在列?

How can I check if a column exists in a table of the SQL Server database?

推荐答案

SQL Server 2005 以上:

SQL Server 2005 onwards:

IF EXISTS(SELECT 1 FROM sys.columns 
          WHERE Name = N'columnName'
          AND Object_ID = Object_ID(N'schemaName.tableName'))
BEGIN
    -- Column Exists
END

Martin Smith 的版本更短:

Martin Smith's version is shorter:

IF COL_LENGTH('schemaName.tableName', 'columnName') IS NOT NULL
BEGIN
    -- Column Exists
END

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