mysql client basics

Last reviewed May 28, 2026 Content v20260528

Track mode

sql_sandbox

Means

SQL sandbox

Reading

~1 min

Level

beginner

This lesson

This lesson teaches mysql client basics: the SQL patterns, schema habits, and query reasoning you need before advancing in MySQL.

Teams query mysql client basics on every MySQL codebase—skipping it leaves gaps in debugging and data reviews.

You will apply mysql client basics in contexts like: Web apps on shared hosting, ecommerce, and many startups’ first production DB.

Copy MySQL SQL into the mysql client, local MySQL/MariaDB, or DB Fiddle (MySQL dialect)—use DESCRIBE and EXPLAIN where lessons show them. The in-browser lab ships later; mysql client is the practice path now. Also run SELECT VERSION() first to confirm MySQL vs MariaDB.

When you can explain the previous lesson's ideas without copying example queries verbatim.

The mysql program is the official interactive client. Statements end with ;; backslash commands start with \.

Connect

# Shell:
mysql -u root -p -h 127.0.0.1 practice

-- Inside mysql:
SELECT DATABASE();
SHOW VARIABLES LIKE 'version%';

Practice: Run on database practice in mysql client.

Help and history

help;
help SELECT;
\s
\q  -- quit

Running scripts

SOURCE /path/to/seed.sql;

Important interview questions and answers

Q: mysql vs mysqld?
A: mysql is client; mysqld is server daemon.
Q: SOURCE command?
A: Executes SQL file in current session.

Self-check

How do you quit mysql client?
What shows current database name?

Pitfall: Forgetting semicolon—mysql waits for statement end.

Interview prep

mysql vs mysqld?: Client program vs server daemon.
SOURCE?: Runs SQL from file in current session.

Discussion

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Starter discussion topics

SOURCE scripts?
Quit client?

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