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SQL UNIQUE Constraint

Free paypal money generator 2016 no activation key. The UNIQUE constraint ensures that all values in a column are different.

Both the UNIQUE and PRIMARY KEY constraints provide a guarantee for uniqueness for a column or set of columns.

A PRIMARY KEY constraint automatically has a UNIQUE constraint.

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However, you can have many UNIQUE constraints per table, but only one PRIMARY KEY constraint per table.

SQL UNIQUE Constraint on CREATE TABLE

The following SQL creates a UNIQUE constraint on the 'ID' column when the 'Persons' table is created:

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MySQL:

To name a UNIQUE constraint, and to define a UNIQUE constraint on multiple columns, use the following SQL syntax:

MySQL / SQL Server / Oracle / MS Access:

SQL UNIQUE Constraint on ALTER TABLE

To create a UNIQUE constraint on the 'ID' column when the table is already created, use the following SQL:

MySQL / SQL Server / Oracle / MS Access:

To name a UNIQUE constraint, and to define a UNIQUE constraint on multiple columns, use the following SQL syntax:

MySQL / SQL Server / Oracle / MS Access:

DROP a UNIQUE Constraint

To drop a UNIQUE constraint, use the following SQL:

MySQL:

SQL Server / Oracle / MS Access:

This PostgreSQL tutorial explains how to create, add, and drop unique constraints in PostgreSQL with syntax and examples.

What is a unique constraint in PostgreSQL?

A unique constraint is a single field or combination of fields that uniquely defines a record. Some of the fields can contain null values as long as the combination of values is unique.

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What is the difference between a unique constraint and a primary key?

Create unique Contraint - Using a CREATE TABLE statement

The syntax for creating a unique constraint using a CREATE TABLE statement in PostgreSQL is:

table_name

The name of the table that you wish to create.

column1, column2

The columns that you wish to create in the table.

constraint_name

The name of the unique constraint.

uc_col1, uc_col2, .. uc_col_n

The columns that make up the unique constraint.

Example

Let's look at an example of how to create a unique constraint in PostgreSQL using the CREATE TABLE statement.

In this example, we've created a unique constraint on the order_details table called order_unique. It consists of only one field - the order_id field.

We could also create a unique constraint with more than one field as in the example below:

Create unique contraint - Using an ALTER TABLE statement

The syntax for creating a unique constraint using an ALTER TABLE statement in PostgreSQL is:

table_name

The name of the table to modify. This is the table that you wish to add a unique constraint to.

constraint_name

The name of the unique constraint.

column1, column2, .. column_n

The columns that make up the unique constraint.

Example

Let's look at an example of how to add a unique constraint to an existing table in PostgreSQL using the ALTER TABLE statement.

In this example, we've created a unique constraint on the existing order_details table called order_unique. It consists of the field called order_id.

We could also create a unique constraint with more than one field as in the example below:

Drop Unique Constraint

The syntax for dropping a unique constraint in PostgreSQL is:

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table_name

The name of the table to modify. This is the table that you wish to remove the unique constraint from.

constraint_name

The name of the unique constraint to remove.

Example

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Let's look at an example of how to remove a unique constraint from a table in PostgreSQL.

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In this example, we're dropping a unique constraint on the order_details table called order_unique.