coderDude
0
Q:

sql alter table

ALTER TABLE Customers
ADD Email varchar(255);
25

  ALTER TABLE Customers
ADD Email varchar(255);
 
5
ALTER TABLE table_name
ADD column_name datatype;

--example
ALTER TABLE Customers
ADD Email varchar(255);
6
ALTER TABLE table_name
ALTER COLUMN column_name datatype;
7

ALTER TABLE table_name

ADD column_name datatype; 
1
ALTER TABLE dbo.doc_exa 
ADD column_b VARCHAR(20) NULL, 
	column_c INT NULL ;
12
ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;
8
ALTER TABLE table_name
ADD column_name datatype;
5
ALTER TABLE table_name 
ADD column_name datatype;
4

ALTER TABLE table_name

MODIFY column_name datatype; 
5
-- 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
0

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