Hi! Could we please enable some services and cookies to improve your experience and our website?

SQLize | PHPize | SQLtest

Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code

A A A
Login    Share code      Blog   FAQ
Copy Format Clear
create table null_test ( id int, test varchar(64) ); insert into null_test values (1, 'Test'); insert into null_test values (2, null); insert into null_test values (3, ''); select id, test, case when test is null then 'test is NULL' else 'test NOT NULL' end isNULL from null_test; select id, test from null_test where test = '';

Stuck with a problem? Got Error? Ask AI support!

Copy Clear
Have a question? Ask in our telegram chat!
Contact us:
© 2025 Free Online SQL Playground: Practice & Master SQL Skills | About project | Privacy Policy and Disclaimer
The site powered by: Contabo
PHP versions: PHP 7.4, PHP 8.0, PHP 8.1, PHP 8.2, PHP 8.3, PHP 8.4
RDBMS versions: MySQL 8.0, MySQL 8.0 Sakila (ReadOnly), MySQL 9.3.0, MariaDB 11.4, MariaDB 11.8, MariaDB 11.8 OpenFlights (ReadOnly), MariaDB 10, MariaDB 10 Sakila (ReadOnly), SQLite 3, SQLite 3 Preloaded, PostgreSQL 10 Bookings (ReadOnly), PostgreSQL 13, PostgreSQL 14, PostgreSQL 15, PostgreSQL 16, PostgreSQL 17 + PostGIS, PostgreSQL 17 + PostGIS WorkShop (ReadOnly), MS SQL Server 2017, MS SQL Server 2019, MS SQL Server 2022, MS SQL Server 2022 AdventureWorks (ReadOnly), Firebird 4.0, Firebird 4.0 (Employee), Firebird 5.0, RedDatabase 5.0, Oracle Database 19c (HR), Oracle Database 21c, Oracle Database 26ai, SOQOL, ClickHouse