sql server alter column
ALTER TABLE table_name ALTER COLUMN column_name new_data_type(size);
sql server alter column
ALTER TABLE table_name ALTER COLUMN column_name new_data_type(size);
orcale sql change column type
ALTER TABLE table_name MODIFY column_name action;
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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