เปลี่ยนแปลงคอลัมน์ชื่อแอททริบิวต์ต่างๆ

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ภาษา sql เซิร์ฟเวอร์เปลี่ยนแปลงคอลัมน์

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);
0
0

ภาษา sql เปลี่ยนแปลงบนโต๊ะ

-- 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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