Generate Unique Key In Sql

SQL UNIQUE Constraint

Having primary key and/or unique key allows Synapse SQL pool engine to generate an optimal execution plan for a query. All values in a primary key column or a unique constraint column should be unique. After creating a table with primary key or unique constraint in Synapse SQL pool, users need to make sure all values in those columns are unique. https://eazyeda.weebly.com/ti-83-calculator-download-mac.html. Select the Unique check box. Under Index key columns, click Add. In the Select Columns fromtablename dialog box, select the check box or check boxes of the table column or columns to be added to the unique index. In the New Index dialog box, click OK. Using Transact-SQL To create a unique index on a table.

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.

Generate new ssh key with same private key. A PRIMARY KEY constraint automatically has a UNIQUE constraint.

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SQL UNIQUE Constraint on CREATE TABLE

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

SQL Server / Oracle / MS Access:

CREATE TABLE Persons (
ID int NOT NULL UNIQUE,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int
);

MySQL:

CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
UNIQUE (ID)
);

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

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CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
CONSTRAINT UC_Person UNIQUE (ID,LastName)
);

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:

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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:

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ALTER TABLE Persons
ADD CONSTRAINT UC_Person UNIQUE (ID,LastName);

DROP a UNIQUE Constraint

To drop a UNIQUE constraint, use the following SQL:

MySQL:

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SQL Server / Oracle / MS Access:

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Learn about table constraints in Synapse SQL pool, including primary key, foreign key, and unique key.

Table constraints

Synapse SQL pool supports these table constraints:

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Oracle Unique Key

PRIMARY KEY is only supported when NONCLUSTERED and NOT ENFORCED are both used.
UNIQUE constraint is only supported with NOT ENFORCED is used.

For syntax, check ALTER TABLE and CREATE TABLE.

FOREIGN KEY constraint is not supported in Synapse SQL pool.

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