MySQL CREATE DATABASE Statement The CREATE DATABASE statement is used to create a new database in MySQL. Syntax CREATE DATABASE databasename; databasename: The name of th ...
MySQL DROP DATABASE Statement The DROP DATABASE statement is used to delete an existing database in MySQL, along with all its objects such as tables, views, and stored procedures. ...
The CREATE TABLE statement is used to create a new table in a database, defining its columns, their data types, and other constraints. Syntax CREATE TABLE table_name ( col ...
The DROP TABLE statement is used to remove an existing table from the database. When a table is dropped, all the data, the table structure, and any associated constraints or indexe ...
The ALTER TABLE statement is used to modify an existing table's structure, such as adding, deleting, or modifying columns, as well as adding or removing constraints. ALTER TABLE ...
SQL constraints are rules applied to the data in a table to ensure data integrity and correctness. Constraints can be applied at the column level or table level. They restrict the ...
The NOT NULL constraint in MySQL ensures that a column cannot contain NULL values. This is important to ensure that every record has a valid value for that column, which can help m ...
The UNIQUE constraint in MySQL ensures that all values in a specified column or combination of columns are distinct. This is useful for ensuring data integrity and preventing dupli ...
The PRIMARY KEY constraint is used to uniquely identify each record in a database table. This constraint ensures that the values in the specified column(s) are unique and not NULL. ...
The FOREIGN KEY constraint establishes a relationship between two tables by linking a column (or group of columns) in the child table to a PRIMARY KEY in the parent table. This ens ...
The CHECK constraint is used to limit the values that can be inserted into a column or set of columns. It ensures that the data meets a specified condition before it is allowed to ...
The DEFAULT constraint is used to assign a default value to a column when a new record is inserted, provided no value is explicitly specified for that column. It ensures that colum ...
The CREATE INDEX statement is used to create indexes in a database table. Indexes improve query performance by allowing the database to find data more quickly without scanning ever ...
An AUTO INCREMENT field in MySQL allows the automatic generation of a unique value for a column when a new record is inserted into a table. This is particularly useful for primary ...
Working with dates in MySQL can be tricky if you're not careful with formats, especially when time components are involved. Here's a summary of MySQL's date and time data types and ...
A view in MySQL is a virtual table that is based on the result-set of a query. Views allow you to represent data from one or more tables as if it were a single table, which can sim ...