SQL

sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

alter table query sql server change column

ALTER TABLE employees
  ALTER COLUMN last_name VARCHAR(75) NOT NULL;

alter table query sql server change column

ALTER TABLE table_name
  ALTER COLUMN column_name column_type;

How to Alter column in SQL Server - NAYCode.com

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Alter Table Customers Alter Column Cust_City nvarchar(100)
Alter Table Customers Alter Column Cust_State nvarchar(100)

alter table query sql server change column

sp_rename 'employees.last_name', 'lname', 'COLUMN';

How to Alter column in SQL Server - NAYCode.com

Alter Table [Table Name] Alter Column [Column Name]  [datatype]

alter table query sql server change column

sp_rename 'table_name.old_column_name', 'new_column_name', 'COLUMN';

alter table query sql server change column

ALTER TABLE table_name
  DROP COLUMN column_name;