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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
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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
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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
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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
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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
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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
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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
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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
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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
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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:
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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
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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
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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
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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"