The language used to communicate with databases -- query, insert, update, delete data.
SQL (Structured Query Language) is the standard language for interacting with relational databases. It is how you tell a database what to do: create tables, insert data, query records, update values, and delete rows (CRUD).
Core SQL concepts include tables with columns and rows, primary keys, foreign keys, joins (combining tables), and filtering with WHERE clauses. RLS uses SQL conditions to secure data at the row level. Migrations track SQL changes to your schema over time.
SQL powers the Backend of most applications. Supabase provides a SQL editor for writing queries directly. Claude Code writes SQL for you — creating tables, defining relationships, and optimizing queries. Learning SQL is one of the most valuable skills for Full Stack development.
SQL operates on tables — structured collections of rows and columns. Each table can have RLS Policies written in SQL that control permissions at the row level.
SQL is also used to create database triggers — automated functions that fire when rows are inserted, updated, or deleted.
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