SQL
Binary Data Types
| DataType | Description |
|---|---|
| BINARY | Fixed-length binary data. |
| VARBINARY | Variable-length binary data. |
| BLOB | Binary Large Object, used to store large binary data. |
Boolean Data Type
| DataType | Description |
|---|---|
| BOOLEAN | Stores TRUE or FALSE values. |
Miscellaneous Data Types
| DataType | Description |
|---|---|
| ENUM | Enumerated type, which defines a list of permitted values. |
| SET | Similar to ENUM, but can store multiple values. |
| UUID | Universally Unique Identifier. |
Example Table Using Various Data Types
CREATE TABLE ExampleTable (
ID INT PRIMARY KEY,
Name VARCHAR(100),
BirthDate DATE,
Email VARCHAR(255),
Salary DECIMAL(10, 2),
IsActive BOOLEAN,
ProfilePicture BLOB,
Preferences ENUM('Low', 'Medium', 'High')
);
Choosing Data Types
Choosing the appropriate data type is crucial for data integrity, performance, and storage optimization. Consider the nature of the data and the operations that will be performed on it when selecting data types.
General Tips!
- Use Proper Indexing: Index frequently queried columns to improve query performance, but avoid over-indexing as it can slow down write operations.
- Write Efficient Queries: Optimize your queries by selecting only the necessary columns, avoiding SELECT *, and using joins wisely.
- Normalize Your Data: Organize your database into normalized tables to reduce redundancy and improve data integrity.
- Use Transactions: Ensure data consistency and integrity by wrapping multiple related operations in transactions, especially in multi-step processes.
- Understand and Use SQL Functions: Leverage built-in SQL functions for data manipulation and retrieval, such as aggregate functions (SUM, COUNT) and string functions (CONCAT, SUBSTRING).