Sql Modify — Free Sql Tutorial
Learn Sql Modify in Sql with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Sql Modify in Sql with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Sql Modify in Sql
INSERT INTO adds new rows to a table. You can insert a single row or multiple rows at once. Always list the column names explicitly to avoid issues if the table structure changes.
UPDATE modifies existing rows. The WHERE clause specifies which rows to update. WARNING: UPDATE without WHERE updates ALL rows — always check your WHERE clause first!
DELETE removes rows. Like UPDATE, always include WHERE or you'll delete everything. In production, it's good practice to do a SELECT first with the same WHERE to verify what would be deleted.
Sql Modify — Syntax
-- INSERT INSERT INTO table (col1, col2) VALUES (val1, val2); -- UPDATE (ALWAYS add WHERE!) UPDATE table SET col = value WHERE condition; -- DELETE (ALWAYS add WHERE!) DELETE FROM table WHERE condition;
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