Mysql alter表类型

代码示例

alter table添加列

ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;

alter table column将数据类型更改为text mysql

ALTER TABLE tablename MODIFY columnname INTEGER;

sql alter table

-- With check if field already exists

IF NOT EXISTS(SELECT 1 FROM sys.columns 
          WHERE Name = N'Email'
          AND Object_ID = Object_ID(N'dbo.Customers'))
BEGIN    
	ALTER TABLE Customers
    ADD Email varchar(255);
END

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empty row

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