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The syntax for the column-definition for a new column is a subset of the syntax ALTER TABLE ADD UNIQUE or PRIMARY KEY provide a shorthand method of
 If a PRIMARY KEY constraint already exists, you can modify or delete it. For example, you may want the PRIMARY KEY constraint of the table to reference other
 6 Jan 2012 The only way would be to drop the constraint with an Alter table then PRIMARY KEY CONSTRAINT cannot be altered, you may only drop it
 
 3 Aug 2012 drop current primary key constraint ALTER TABLE dbo.persion DROP DROP CONSTRAINT <constraint_name> Example: ALTER TABLE
 DROP PRIMARY KEY statement to drop the existing primary key, and then execute an ALTER TABLEALTER column-name column-alteration statement to set
 If you add a UNIQUE INDEX or PRIMARY KEY to a table, MySQL stores it before any nonunique index to permit detection of duplicate keys as early as possible.
 SQL ALTER TABLE Command - Learn SQL (Structured Programming Language) in The basic syntax of an ALTER TABLE command to ADD PRIMARY KEY
 Note. In Oracle, a primary key can not contain more than 32 columns. A primary key can be defined in either a CREATE TABLE statement or an ALTER TABLE statement.
 SQL PRIMARY KEY on ALTER TABLE. ADD CONSTRAINT PK_Person PRIMARY KEY (ID,LastName); Note: If you use the ALTER TABLE statement to add a primary key, the primary key column(s) must already have been declared to not contain NULL values (when the table was first created).
     
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