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SQL Tutorial
BOSS QUIZ
10 questions · 5 minutes · pass at 70% to clear the track.
05:00
Start
Q1.
The three questions to ask of every new query are…
from SQL Summary
Length, cost, latency
Correctness, indexes, scale-up behaviour
Author, date, team
Encoding, language, region
Q2.
% in LIKE matches…
from SQL LIKE
A single char
Zero or more chars
Whitespace
Digits only
Q3.
For money columns, prefer…
from SQL Data Types
FLOAT
DOUBLE
DECIMAL(p, s)
INT cents
Q4.
Fill-in-the-blank trains…
from SQL Exercises
Recognition
Recall
Typing
Reading
Q5.
Each lesson has…
from SQL Exercises
No exercise
One exercise
Five exercises
Ten exercises
Q6.
The fix is…
from SQL Injection
Escape quotes by hand
Parameterised / prepared statements
A WAF only
TLS only
Q7.
HAVING filters…
from SQL HAVING
Rows before aggregation
Whole groups after aggregation
Columns
Indexes
Q8.
Which is the "not equal" operator (besides !=)?
from SQL WHERE
<>
><
~=
==
Q9.
You can wrap UPDATE in a transaction to…
from SQL UPDATE
ROLLBACK if the row count looks wrong
Make it faster
Skip the WHERE clause
Bypass constraints
Q10.
Managed DB services give you…
from SQL Hosting
Schema design
Automatic backups, patching, failover
Query tuning
Free hardware
Submit
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