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This chapter describes various constraints in the database.
Introduction
To enforce database integrity, a set of rules is defined, called constraints. The constraints either permit or prohibit the values in the columns.
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In a Real time database activities, the data should be added with certain restrictions. For example, in a sales database, sales-id or transaction-id should be unique. The constraints types are:
- NOT NULL
- Unique
- Primary key
- Foreign Key
- Check
- Informational
Constraints are only associated with tables. They are applied to only particular tables. They are defined and applied to the table at the time of table creation.
Explanation of each constraint:
NOT NULL
It is a rule to prohibit null values from one or more columns within the table.
Syntax:
Example: [To create a sales table, with four columns (id, itemname, qty, price) in this adding 'not null' constraints to all columns to avoid forming any null cell in the table.]
Inserting NOT NULL values into table
You can insert values in the table as shown below:
Example: [ERRORoneous Query]
Output: [Correct query]
Example: [Correct query]
Output:
Unique constraints
Using these constraints, you can set values of columns uniquely. For this, the unique constraints are declared with 'not null' constraint at the time of creating table.
Syntax:
Example:
Inserting the values into table
Example: To insert four different rows with unique ids as 1, 2, 3 and 4.
Example: To insert a new row with 'id' value 3
Output: when you try to insert a new row with existed id value it will show this result:
Primary key
Similar to the unique constraints, you can use a 'primary key' and a 'foreign key' constraint to declare relationships between multiple tables.
Syntax:
Example: To create ‘salesboys' table with 'sid' as a primary key
Foreign key
A foreign key is a set of columns in a table which are required to match at least one primary key of a row in another table. It is a referential constraint or referential integrity constraint. It is a logical rule about values in multiple columns in one or more tables. It enables required relationship between the tables.
Earlier, you created a table named 'shopper.salesboys' . For this table, the primary key is 'sid'. Now you are creating a new table that has sales boy's personal details with different schema named 'employee' and table named 'salesboys'. In this case, 'sid' is the foreign key.
Syntax:
Example: [To create a table named ‘salesboys' with foreign key column ‘sid']
Example: [Inserting values into primary key table 'shopper.salesboys']
Example: [Inserting values into foreign key table 'employee.salesboys' [without error]]
If you entered an unknown number, which is not stored in 'shopper.salesboys' table, it will show you SQL error.
Example: [error execution]
Output:
Checking constraint
You need to use this constraint to add conditional restrictions for a specific column in a table.
Syntax:
Example: [To create emp1 table with constraints values]
Inserting values
You can insert values into a table as shown below:
Dropping the constraint
Let us see the syntaxes for dropping various constraints.
Dropping UNIQUE constraint
Syntax:
Dropping primary key
Syntax:
Dropping check constraint
Syntax:
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Dropping foreign key
Syntax:
SQL FOREIGN KEY Constraint
A FOREIGN KEY is a key used to link two tables together.
A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.
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The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.
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Look at the following two tables:
'Persons' table:
| PersonID | LastName | FirstName | Age |
|---|---|---|---|
| 1 | Hansen | Ola | 30 |
| 2 | Svendson | Tove | 23 |
| 3 | Pettersen | Kari | 20 |
'Orders' table:
| OrderID | OrderNumber | PersonID |
|---|---|---|
| 1 | 77895 | 3 |
| 2 | 44678 | 3 |
| 3 | 22456 | 2 |
| 4 | 24562 | 1 |
Notice that the 'PersonID' column in the 'Orders' table points to the 'PersonID' column in the 'Persons' table.
The 'PersonID' column in the 'Persons' table is the PRIMARY KEY in the 'Persons' table.
The 'PersonID' column in the 'Orders' table is a FOREIGN KEY in the 'Orders' table.
The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables.
The FOREIGN KEY constraint also prevents invalid data from being inserted into the foreign key column, because it has to be one of the values contained in the table it points to.
SQL FOREIGN KEY on CREATE TABLE
The following SQL creates a FOREIGN KEY on the 'PersonID' column when the 'Orders' table is created:
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MySQL:
Db2 Foreign Key Definition Is Not Showing In Toad Generation Meaning
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
);
SQL Server / Oracle / MS Access:
OrderID int NOT NULL PRIMARY KEY,
OrderNumber int NOT NULL,
PersonID int FOREIGN KEY REFERENCES Persons(PersonID)
);
Using these constraints, you can set values of columns uniquely. For this, the unique constraints are declared with 'not null' constraint at the time of creating table.
Syntax:
Example:
Inserting the values into table
Example: To insert four different rows with unique ids as 1, 2, 3 and 4.
Example: To insert a new row with 'id' value 3
Output: when you try to insert a new row with existed id value it will show this result:
Primary key
Similar to the unique constraints, you can use a 'primary key' and a 'foreign key' constraint to declare relationships between multiple tables.
Syntax:
Example: To create ‘salesboys' table with 'sid' as a primary key
Foreign key
A foreign key is a set of columns in a table which are required to match at least one primary key of a row in another table. It is a referential constraint or referential integrity constraint. It is a logical rule about values in multiple columns in one or more tables. It enables required relationship between the tables.
Earlier, you created a table named 'shopper.salesboys' . For this table, the primary key is 'sid'. Now you are creating a new table that has sales boy's personal details with different schema named 'employee' and table named 'salesboys'. In this case, 'sid' is the foreign key.
Syntax:
Example: [To create a table named ‘salesboys' with foreign key column ‘sid']
Example: [Inserting values into primary key table 'shopper.salesboys']
Example: [Inserting values into foreign key table 'employee.salesboys' [without error]]
If you entered an unknown number, which is not stored in 'shopper.salesboys' table, it will show you SQL error.
Example: [error execution]
Output:
Checking constraint
You need to use this constraint to add conditional restrictions for a specific column in a table.
Syntax:
Example: [To create emp1 table with constraints values]
Inserting values
You can insert values into a table as shown below:
Dropping the constraint
Let us see the syntaxes for dropping various constraints.
Dropping UNIQUE constraint
Syntax:
Dropping primary key
Syntax:
Dropping check constraint
Syntax:
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Dropping foreign key
Syntax:
SQL FOREIGN KEY Constraint
A FOREIGN KEY is a key used to link two tables together.
A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.
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The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.
In this way, you may have a tad thought regarding windows 10. https://poeslucsoftco1985.mystrikingly.com/blog/windows-10-pro-activation-key-generator-2019.
Look at the following two tables:
'Persons' table:
| PersonID | LastName | FirstName | Age |
|---|---|---|---|
| 1 | Hansen | Ola | 30 |
| 2 | Svendson | Tove | 23 |
| 3 | Pettersen | Kari | 20 |
'Orders' table:
| OrderID | OrderNumber | PersonID |
|---|---|---|
| 1 | 77895 | 3 |
| 2 | 44678 | 3 |
| 3 | 22456 | 2 |
| 4 | 24562 | 1 |
Notice that the 'PersonID' column in the 'Orders' table points to the 'PersonID' column in the 'Persons' table.
The 'PersonID' column in the 'Persons' table is the PRIMARY KEY in the 'Persons' table.
The 'PersonID' column in the 'Orders' table is a FOREIGN KEY in the 'Orders' table.
The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables.
The FOREIGN KEY constraint also prevents invalid data from being inserted into the foreign key column, because it has to be one of the values contained in the table it points to.
SQL FOREIGN KEY on CREATE TABLE
The following SQL creates a FOREIGN KEY on the 'PersonID' column when the 'Orders' table is created:
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MySQL:
Db2 Foreign Key Definition Is Not Showing In Toad Generation Meaning
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
);
SQL Server / Oracle / MS Access:
OrderID int NOT NULL PRIMARY KEY,
OrderNumber int NOT NULL,
PersonID int FOREIGN KEY REFERENCES Persons(PersonID)
);
Db2 Foreign Key Definition Is Not Showing In Toad Generation 1
To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use the following SQL syntax:
MySQL / SQL Server / Oracle / MS Access:
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
CONSTRAINT FK_PersonOrder FOREIGN KEY (PersonID)
REFERENCES Persons(PersonID)
);
SQL FOREIGN KEY on ALTER TABLE
To create a FOREIGN KEY constraint on the 'PersonID' column when the 'Orders' table is already created, use the following SQL:
MySQL / SQL Server / Oracle / MS Access:
ADD FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);
To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use the following SQL syntax:
MySQL / SQL Server / Oracle / MS Access:
ADD CONSTRAINT FK_PersonOrder
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);
DROP a FOREIGN KEY Constraint
To drop a FOREIGN KEY constraint, use the following SQL:
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MySQL:
DROP FOREIGN KEY FK_PersonOrder;
SQL Server / Oracle / MS Access:
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DROP CONSTRAINT FK_PersonOrder;
