primary key

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  1. Surrogate vs Natural Keys in Databases
    When designing a database, a fundamental decision is choosing the primary key, a unique identifier for each record. There are two main approaches: surrogate keys and natural/business keys
  2. Hi/Lo Algorithm Explained
    Here's how it works:Hi Value: A high value is chosen as the starting point for the primary key range. This value should be significantly higher than the expected number of records you'll need to insert
  3. Retrieve Last SQLite ID
    Understanding the Problem: When using SQLite databases, especially with auto-incrementing primary keys, it's often necessary to retrieve the ID of the last inserted row
  4. Make ID Auto-Increment in MySQL
    Understanding the Concept:Auto-Increment: A MySQL feature that automatically assigns a unique, sequential number to each new row inserted into a table
  5. SQLite Auto-Increment Explained
    Understanding Auto-IncrementIn database systems, especially relational databases like SQLite, an auto-increment column is a special type of column that automatically generates a unique
  6. Add Auto-Incrementing Primary Key PostgreSQL
    Identify the Table:Identify the Table:Add a New Serial Column:Use the ALTER TABLE command to add a new column to the table
  7. Alternative Methods for SQLite Primary Keys on Multiple Columns
    Here's a breakdown:DDL (Data Definition Language): A subset of SQL used to define the structure of a database, including creating tables
  8. Reset Postgres Primary Key Sequence
    Understanding the Problem:This mismatch can occur due to various reasons, such as manual deletions, bulk inserts, or external data modifications
  9. Add Auto-Increment Primary Key SQL Server
    Understanding the Concept:Primary key: A column or combination of columns that uniquely identifies each row in a table. It's crucial for data integrity and relationships
  10. Single Primary Key in Database Tables
    Short Answer: No, you cannot have multiple primary keys in a single table in most relational databases.Long Explanation:
  11. Alternatives to MySQL Auto-Increment for Unique Identifiers
    It's typically used for the primary key column.In MySQL (including MariaDB), the AUTO_INCREMENT attribute automatically generates unique IDs for new rows in a table
  12. Optimizing SQLite Queries: When to Use Implicit vs. Explicit Indexes on Primary Keys
    Indexing is a technique used to speed up data retrieval in databases. It creates an additional data structure (like a B-Tree) that maps specific values in a column to the corresponding row locations
  13. Ensuring Data Integrity: Choosing the Right Primary Key Strategy for Your Database
    GUID (Globally Unique Identifier): A randomly generated string used as a unique identifier.MD5 Hash: A function that converts a string into a fixed-length string of characters
  14. Guiding Your Way to Better Performance: Choosing the Right Identifier for Your Database
    Example: Imagine a function generateStandardGuid() that returns a random string like "3f250cee-e3b1-4213-94f8-b9e43b7f33f2"