What is MySQL index?
May 20th, 2016
Indexing in MySQL is used to speed up and facilitate data retrieval. If an index has been attached to a column, the MySQL data query "jumps" immediately to that particular row, skipping t...
MySQL Index, Keys and Constraints
The UNIQUE constraint in MySQL
May 20th, 2016
The UNIQUE constraint uniquely identifies each record in a database table. The UNIQUE and
PRIMARY key in MySQL
May 20th, 2016
The PRIMARY KEY constraint uniquely identifies each record in a database table.
Following rules and suggestions are applied to the PRIMARY key:
FOREIGN keys in MySQL:
May 20th, 2016
A FOREIGN KEY in one table points to a PRIMARY KEY in another table. Let say we have two tables here, Emp & Dept. Note that DeptNo column in Dept table points to colum...
What is CHECK constraint in MySQL?
May 20th, 2016
The CHECK constraint specifies a condition that must be true when manipulating the database table.
Following example shows how a CHECK constraint may be implemented:
The DEFAULT constraint in MySQL
May 20th, 2016
The DEFAULT constraint is used to insert a default value into a column. The default value will be added to all new records, if no other value is specified.
CREATE TAB...
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