add column to existing table sql code example

Example 1: sql add column

ALTER TABLE Customers
ADD Email varchar(255);

Example 2: alter table add column

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

Example 3: sqlserver add column to table

ALTER TABLE dbo.doc_exa 
ADD column_b VARCHAR(20) NULL, 
	column_c INT NULL ;

Example 4: alter table add column

ALTER TABLE table_name 
ADD column_name datatype;

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