The primary key index does not allow ________ data in a field
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Q. The primary key index does not allow ________ data in a field.
Answer => Duplicate
--> The primary key index does not allow duplicate data in a field.
☆ PRIMARY KEY ☆
• A primary key column cannot have NULL values.
• We denote the primary key by underlining the column name.
• The value of primary key should be unique for each row of the table.
• Primary key column cannot contain duplicate values.
• A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key.
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Q. The primary key index does not allow ________ data in a field.
Answer => Duplicate
--> The primary key index does not allow duplicate data in a field.
☆ PRIMARY KEY ☆
• A primary key column cannot have NULL values.
• We denote the primary key by underlining the column name.
• The value of primary key should be unique for each row of the table.
• Primary key column cannot contain duplicate values.
• A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key.
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