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In a MySQL table, a field key is typically referred to as a "primary key." The primary key is a unique identifier for each record in the table, ensuring that no two rows have the same value in that field. It can be defined using the PRIMARY KEY constraint when creating or altering a table. Additionally, other types of keys, such as foreign keys, can establish relationships between tables.
What else can I help you with?
How do you create a TABLE in MySQL?
To create a table in MySQL you will need to use the CREATE TABLE function. This is simple enough to use, a simple example of creating a users table is below, it has a unique id (Primary Key) with a unique username and a password field (which I would recommend storing as an MD5). CREATE TABLE users (id INT( 10 ) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY , username VARCHAR( 16 ) NOT NULL , password CHAR( 32 ) NOT NULL , UNIQUE ( username ) );
When a relationship exists between two tables in a database for Microsoft acess what name is given to the matching field in the related table?
The field in a related table that matches a field in another table is called a foreign key. This foreign key establishes the relationship between the two tables in a database.
What symbol means the field is the primary key for the table appears in front of a field in the table window?
key
How the primary key is declared in MySQL?
Its best to choose an ID for each table to use as the Primary Key (PK). This is best as an INT due to speed.
What six columns are shown in the output of the DESCRIBE table statement?
Field Name of the table field.Type Column type such as varchar or timestamp.Null Does the field allow null values?Key Is this field a primary key or (a part of) and index?Default Default field value.Extra Additional information such as "on update CURRENT_TIMESTAMP"
Can a primary key refer to a whole table?
No, a primary key do not refers to the whole table .A primary key refers to a field in the table that is not null and unique.
What are the different methods to assign any field as primary key in a table?
There are several methods to assign a primary key in a table, including: Single-column primary key: Designate a single field (e.g., an ID number) as the primary key to uniquely identify each record. Composite primary key: Use a combination of two or more columns to create a unique identifier, ensuring that the combination of values is unique across the table. Auto-incrementing primary key: Implement a field that automatically generates a unique value (such as an integer) for each new record, commonly used in databases like MySQL. Unique constraints: Define a field with a unique constraint to enforce uniqueness, which can also serve as a primary key if it meets the requirements.
True or false A foreign key is a field in one table that refers to the primary key field in another table and indicates how the the tables are related?
True.
What is the linking field in the many table called?
Foreign key field
Does Access automatically creates and maintains an index for a table's primary key?
Access automatically creates an index for the primary key field in a table. In addition, Access automatically creates an index for any field name that contains the following letter sequences: code, ID, key, or num.
Access automatically adds a field called as the first field in the table?
key field
What does the term foreign key mean in databases?
The foreign key is used as a reference in a table to the primary key of another table. For example: consider a table employee with id(primary key), name, address,department_id(foreign key) as its fields.Another table department with fields department_id(primary key) and dept_name. So, department_id is primary key in department table and foreign key in employee table.
