SQL TOP, LIMIT and FETCH FIRST limit the rows a query returns. Syntax for MySQL, SQL Server, PostgreSQL and SQLite, OFFSET pagination and top-N examples.
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SQL DELETE Statement: Remove Rows from a Table (Examples)
SQL DELETE tutorial: remove rows with WHERE, delete using a subquery or join, DELETE vs TRUNCATE vs DROP, and how to avoid deleting everything.
SQL UPDATE Statement: Modify Existing Rows Safely (Examples)
SQL UPDATE tutorial: change one or many columns with SET and WHERE, update using calculations, update from another table with a join, and stay safe.
SQL NULL Values: IS NULL, IS NOT NULL and COALESCE Explained
SQL NULL values tutorial: what NULL means, IS NULL and IS NOT NULL, why = NULL fails, how NULL behaves in arithmetic and aggregates, and COALESCE examples.
SQL INSERT INTO Statement: Add New Rows to a Table (Examples)
SQL INSERT INTO tutorial: add one row, several rows at once, insert into specific columns, copy rows with INSERT … SELECT, and common errors.
SQL ORDER BY Clause: Sort Query Results ASC and DESC
SQL ORDER BY clause tutorial: sort results ascending or descending, sort by several columns, by expressions and aliases, handle NULLs, and see each result.
Security Dashboard in Google Sheets
Security Dashboard in Google Sheets to track incidents, threats, compliance frameworks, and response performance with interactive charts and KPI cards.
SQL AND, OR, NOT Operators: Combine Multiple Conditions
SQL AND, OR and NOT operators let you combine several WHERE conditions. Learn precedence, parentheses, worked examples with results and the mistakes to avoid.
SQL WHERE Clause: Filter Rows with Conditions (Examples)
SQL WHERE clause tutorial: filter rows with =, <>, >, <, BETWEEN, LIKE and IN, quote text correctly, use WHERE in UPDATE and DELETE, plus common mistakes.
SQL SELECT DISTINCT: Remove Duplicate Rows from Results
SQL SELECT DISTINCT returns only unique values. Learn the syntax, DISTINCT on one or several columns, COUNT(DISTINCT), NULL handling and common mistakes.