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Essential SQL Commands: A Quick Reference Guide
- SQL commands for filtering, sorting, and querying data include WHERE, AND/OR, ORDER BY, LIMIT, BETWEEN, IN, and LIKE.
- Comparison operators like =, !=, >, <, >=, <=, IS, IS NULL, IS NOT NULL, IN, NOT IN, BETWEEN, LIKE, and NOT LIKE are used to compare values in SQL.
- MySQL supports various data types such as CHAR, VARCHAR, TEXT, TINYINT, INT, DATE, TIME, JSON, ENUM, and more.
- Joins in SQL like INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN are used to combine data from multiple tables.
- Database management commands like CREATE DATABASE, USE, DROP DATABASE, CREATE TABLE, ALTER TABLE, SHOW TABLES, and DESCRIBE are essential for managing databases and tables.
- Data manipulation commands including INSERT INTO, SELECT, UPDATE, DELETE, and TRUNCATE TABLE help in manipulating data in SQL tables.
- Aggregate functions like COUNT(), SUM(), AVG(), MIN(), and MAX() are used to perform calculations on data.
- Transactions in SQL such as START TRANSACTION, COMMIT, and ROLLBACK help in managing database transactions effectively to ensure data integrity.
- By mastering these essential SQL commands, one can write efficient queries, manipulate data effectively, and maintain data integrity in database transactions.
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