Alter table to Add an PRIMARY KEY : Primary Key « Key « SQL / MySQL






Alter table to Add an PRIMARY KEY

   

ALTER TABLE tblname ADD PRIMARY KEY (indexcols ...)

   
    
    
  








Related examples in the same category

1.Setting a Primary Key 1
2.Setting a Primary Key 2
3.Setting a Primary Key 3
4.Define and use primary key
5.Another way to enforce uniqueness is to add a UNIQUE index rather than a PRIMARY KEY to a table.
6.To drop an index that is not a PRIMARY KEY, you must specify the index name.
7.Adding primary key for not null column
8.Defining Primary Keys
9.Use a PRIMARY KEY constraint
10.If you were creating a primary key on more than one column, you would include both of those column names in th
11.Two ways to declare primary key when creating the table
12.Create a table t that contains an id column that's NOT NULL and declared as a primary key by means of a PRIMAR
13.A primary key on a column can be created by replacing PRIMARY KEY with UNIQUE in the table definition, provide
14.Add PRIMARY KEY or UNIQUE directly to the end of the column definition.
15.Create a primary key on the last_name and first_name columns using a PRIMARY KEY clause
16.Create a multiple-column primary key using UNIQUE, if the columns are declared NOT NULL
17.Using three column as the primary key
18.Drop primary key