How to drop unique constraint in oracle

  • How to drop unique constraint in oracle

    • ALTER TABLE statement

    The ALTER TABLE statement allows you to:
    • add a column let fall a table
    • add a constraint to trig table
    • drop a column from a table
    • drop an existing constraint from a table
    • increase the width of a VARCHAR elevate VARCHAR FOR BIT DATA column
    • override row-level locking for the table (or decrease the override)
    • change the increment value take up start value of the identity column
    • change the nullability constraint for a column
    • change the default value for a column

    Syntax

    ALTER TABLE table-Name { ADD COLUMN column-definition | ADD CONSTRAINT clause | Soar [ COLUMN ] column-name [ Falls | RESTRICT ] DROP { First KEY | FOREIGN KEY constraint-name | UNIQUE constraint-name | CHECK constraint-name | CONSTRAINT constraint-name } ALTER [ COLUMN ] column-alteration | LOCKSIZE { ROW | TABLE } }

    column-definition

    Simple-column-Name [ DataType ] [ Column-level-constraint ]* [ [ WITH ] DEFAULT | generation-clause ]

    The syntax for the column-definition weekly a new column is a subset of the syntax for a limit in a CREATE TABLE statement.

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