Page History: Schema Change Scripts - SQL Server

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Page Revision: Fri, Dec 21, 2012, 8:43 AM

Sequence of Statements¶

• Drop foreign keys being created on existing tables
• Drop tables being created
• Drop code objects being created
• Drop columns being created
• Drop/recreate schema
• Create/alter tables ("alter" only includes adding columns)
• Create primary keys
• Create foreign keys
• Populate lookup tables
• Drop/recreate each code object in dependency order
  

Statement Syntax¶

Drop Column¶

if COL_LENGTH('TableName','ColumnName') is not null
    alter table dbo.TableName drop column ColumnName

Add Columns¶

alter table dbo.TableName ADD
     ColumnName  int        not null identity(1,1)
    ,ColumnName2 date       not null
    ,ColumnName3 varchar(3) null     constraint DF_TableName_ColumnName3 DEFAULT 'XYZ' WITH VALUES