Normalize your data to remove redundant information and ensure data integrity.

Proper use of indexes can drastically speed up data retrieval times. But remember, over-indexing can have a negative impact on the insert and update operations.

Always use appropriate data types. This can save disk space and ensure you are storing valid data.

Databases should be backed up regularly. The frequency depends on the specific requirements of the business or system.

Implement proper security measures to protect sensitive data. This includes measures like encryption, using secure connections, and proper user access controls.

Inefficient queries can put a significant load on the database. Always look for ways to optimize your SQL queries for better performance.

Documenting your database schema, dependencies, relationships, and processes helps maintain, troubleshoot, and scale your applications.

Ensure your database transactions are Atomic, Consistent, Isolated, and Durable (ACID) to maintain data integrity.

The 'CREATE DATABASE' statement is used to create a new SQL database.

Create Database

The 'CREATE TABLE' statement is used to create a new table in a database.

Create Table

The 'INSERT INTO' statement is used to insert new records in a table.

Insert Into

The 'SELECT' statement is used to select data from a database. The data returned is stored in a result table, called the result-set.

Select

The 'UPDATE' statement is used to modify the existing records in a table.

Update

The 'DELETE' statement is used to delete existing records in a table.

Delete

SQL aggregate functions return a single value, calculated from values in a column. In this example, the 'COUNT' function returns the number of customers.

Aggregate Function

The 'ORDER BY' keyword is used to sort the result-set in ascending or descending order. The 'ASC' keyword denotes ascending order.

Databases

Concepts

Examples

Interview Prep

Best Practices

Learning Resources