如果不存在,我需要添加一个特定的列。我有类似以下的内容,但它总是返回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?


当前回答

首先检查dbo.syscolumns(包含字段定义的内部SQL Server表)中是否存在表/列(id/name)组合,如果不存在,则发出适当的ALTER table查询以添加它。例如:

IF NOT EXISTS ( SELECT  *
            FROM    syscolumns
            WHERE   id = OBJECT_ID('Client')
                    AND name = 'Name' ) 
ALTER TABLE Client
ADD Name VARCHAR(64) NULL

其他回答

如果列不存在,请执行以下操作:

BEGIN
    IF (COL_LENGTH('[dbo].[Table]', 'Column ') IS NULL)
    BEGIN
        // Do something
    END
END;

如果列确实存在,请执行以下操作:

BEGIN
    IF (COL_LENGTH('[dbo].[Table]', 'Column ') IS NOT NULL)
    BEGIN
        // Do something
    END
END;

试试这个。。。

IF NOT EXISTS(
  SELECT TOP 1 1
  FROM INFORMATION_SCHEMA.COLUMNS
  WHERE 
    [TABLE_NAME] = 'Employees'
    AND [COLUMN_NAME] = 'EmployeeID')
BEGIN
  ALTER TABLE [Employees]
    ADD [EmployeeID] INT NULL
END

接受答案的临时表格版本:

if (exists(select 1
           from tempdb.sys.columns
           where Name = 'columnName'
                 and Object_ID = object_id('tempdb..#tableName')))
begin
...
end
IF EXISTS (
SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_CATALOG = 'Database Name'
and TABLE_SCHEMA = 'Schema Name'
and TABLE_NAME = 'Table Name'
and COLUMN_NAME = 'Column Name'
and DATA_TYPE = 'Column Type') -- Where statement lines can be deleted.

BEGIN
  -- Column exists in table
END

ELSE BEGIN
  -- Column does not exist in table
END

我更喜欢INFORMATION_SCHEMA.COLUMNS而不是系统表,因为Microsoft不保证在不同版本之间保留系统表。例如,dbo.syscolumns在SQL Server 2008中仍然有效,但它已被弃用,将来可以随时删除。