Data Retrieval Fundamentals Retrieve specific columns from a dataset: SELECT first_name, last_name, email FROM employees; Eliminate duplicate values from results: SELECT DISTINCT department_id FROM employees; Filter records based on conditions: SELECT product_name, unit_price FROM inventory WHERE un...
Pagination Based on Auto-Incrementing Primary Keys Applicability: Use when the primary key is auto-incrementing and sequential, and results are sorted by the primary key. Example query: SELECT * FROM users LIMIT 90000, 5; This query retrieves 5 records starting from the 90,001st row. The LIMIT claus...
Creating Depratment and Employee Tables with Data Insetrion 1. Departmant Table Creation CREATE TABLE departments ( department_id INT PRIMARY KEY AUTO_INCREMENT COMMENT 'Department ID', department_name VARCHAR(50) COMMENT 'Department Name' ); 2. Inserting Department Data INSERT INTO departments (dep...
SQL (Structured Query Language) is the standard language for managing relational databases. To create a database, you must have a database management system (DBMS) installed, such as MySQL, PostgreSQL, or SQLite, and apropriate privileges, typical administrative or database creation rights. Connect...
A database is a structured repository for storing, organizing, and managing data. It consists of collections of data organized into tables, which can be interrelated. Data in a database can include various types such as text, numbers, dates, and multimedia. To create a database, use the SQL command:...
DELETE Command Purpose DELETE removes specific rows from a table based on given conditions. Characteristics Deletes data row by row Supports rollback (transactional) Triggers row-level triggers Preserves table structure Slower than TRUNCATE when deleting all rows Syntax and Examples DELETE FROM tabl...
Foundational Concepts Data: Symbolic records describing entities. Types include text, graphics, images, audio, and video. A key characteristic is the inseparability of data from its semantics, and data inherently possesses structure. Database (DB): A long-term, organized, and shared collection of da...
1. Data Definition Language (DDL) DDL statements are used to define, modify, and delete database structures. Database Operations -- List all databases SHOW DATABASES; -- Create a new database CREATE DATABASE inventory_db; CREATE DATABASE IF NOT EXISTS inventory_db; -- Remove a database DROP DATABASE...
Record shapes A Record in jOOQ is a typed, positional container that pairs a sequence of Field definitions with their corresponding values. It behaves like a column-to-value tuple stored in order. Generated table-specific records expose getters and setters for each column, but internally a Record st...
Regular expressions describe text patterns using literal characters and metacharacters. In Oracle Database (10g and later), SQL gains native regex support through a set of REGEXP_* functions that implement a POSIX-style dialect with several Perl-like features. This guide summarizes the syntax, optio...