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SQL Tutorial
BOSS QUIZ
10 questions · 5 minutes · pass at 70% to clear the track.
05:00
Start
Q1.
Production schema changes should go through…
from SQL CREATE DATABASE
Ad-hoc CREATE DATABASE
A migration tool (Laravel migrations, Flyway, …)
Direct edits in DataGrip
Stored procedures
Q2.
INSERT INTO … SELECT requires the destination to…
from SQL INSERT INTO SELECT
Not exist
Already exist
Be empty
Have no primary key
Q3.
Indexes have a cost on…
from SQL INDEX
SELECT only
Writes (INSERT/UPDATE/DELETE)
Backups
Nothing
Q4.
IN is shorthand for…
from SQL IN
A series of OR equality checks
A JOIN
AND
NOT
Q5.
A customer with 3 orders appears in the INNER JOIN result…
from SQL INNER JOIN
Once
Three times
Not at all
Twice
Q6.
SOME is a synonym for…
from SQL ANY and ALL
ALL
ANY
NONE
NOT
Q7.
LEFT JOIN keeps every row from…
from SQL LEFT JOIN
The right table
The left table
Both tables
Neither — only matches
Q8.
Safer pattern before a big UPDATE is…
from SQL UPDATE
Run the same WHERE as a SELECT first
Drop the table
Disable indexes
Use lowercase keywords
Q9.
Every non-aggregated SELECT column must appear in…
from SQL GROUP BY
WHERE
GROUP BY
ORDER BY
HAVING
Q10.
DCL stands for…
from SQL Keywords
Data Control Language (GRANT/REVOKE)
Database Compatibility Layer
Direct Call List
Dynamic CASE Logic
Submit
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