Add columns for deletion in SQL

Source: Internet
Author: User
Add column: Alter   Table Seekworker Add Bornid Varchar ( 30 ) Not   Null   Default   ''

Modify columns:Alter TableCorpinfAlter ColumnCorpbriefingVarchar(4000)

Delete column: Alter TableTsuserbangsaleDropColumnCarryno

Delete primary key

Alter   Table Table Name Drop   Constraint Primary Key name

Add primary key

Alter   Table Table Name Add   Constraint Primary Key name Primary   Key (Column 1, column 2 ,......)

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