Databases & SQLBasic SQL Queries (SELECT, WHERE, ORDER BY)

84 items

1

Join and Filter Customer Orders

Code Quiz
2

SELECT with WHERE Filter

Quiz
3

Fix the JOIN Condition

Code Quiz
4

Selecting and Ordering Query Results

Quiz
5

Clause Order in a Grouped Join Query

Code Quiz
6

Filtering Rows with WHERE

Quiz
7

Filtering Rows With NULL Values

Code Quiz
8

SQL Clause Execution Order

Quiz
9

Filter Aggregates with HAVING

Code Quiz
10

Filtering and Sorting Results

Quiz
11

Core SQL Querying Essentials

Slides / Video
12

Filtering Aggregated Results

Quiz
13

SQL Query Building Blocks

Flashcard
14

Selecting All Columns With The Wildcard

Slides / Video
15

Removing Duplicates With DISTINCT

Quiz
16

Comparison Operators

Quiz
17

Column Aliases With AS

Quiz
18

Filtering NULL Values

Quiz
19

Sorting With ORDER BY

Quiz
20

Negating With NOT

Quiz
21

Set Membership With IN

Quiz
22

Filtering With WHERE

Quiz
23

Logical Order Of Clauses

Quiz
24

Combining With AND / OR

Quiz
25

Sorting By Multiple Columns

Quiz
26

Limiting Result Rows

Quiz
27

Pattern Matching With LIKE

Quiz
28

Selecting All Columns

Quiz
29

Ascending vs Descending Sort

Quiz
30

String Literals And Quoting

Quiz
31

Range Filtering With BETWEEN

Quiz
32

Selecting Specific Columns

Quiz
33

SQL Syntax Basics

Slides / Video
34

Limiting Rows With LIMIT and TOP

Slides / Video
35

Removing Duplicates With DISTINCT

Slides / Video
36

Sorting by Multiple Columns

Slides / Video
37

Ascending and Descending Order

Slides / Video
38

Sorting Results With ORDER BY

Slides / Video
39

Handling NULLs With IS NULL

Slides / Video
40

Set Membership Filtering With IN

Slides / Video
41

Range Filtering With BETWEEN

Slides / Video
42

Pattern Matching With LIKE

Slides / Video
43

Combining Conditions With AND, OR, NOT

Slides / Video
44

SQL Comparison Operators in WHERE

Slides / Video
45

Filtering Rows With WHERE

Slides / Video
46

Renaming Columns With AS Aliases

Slides / Video
47

Specifying Tables With FROM

Slides / Video
48

Pattern Matching With LIKE

Code Quiz
49

Limiting Returned Rows

Code Quiz
50

Filtering With IN

Code Quiz
51

Filtering Ranges With BETWEEN

Code Quiz
52

Clause Order In A Query

Code Quiz
53

Sorting Descending

Code Quiz
54

Selecting Specific Columns

Code Quiz
55

WHERE Comparison Operator

Code Quiz
56

Combining Conditions

Code Quiz
57

Removing Duplicates With DISTINCT

Code Quiz
58

Selecting All Columns

Code Quiz
59

Sorting By Multiple Columns

Code Quiz
60

Sorting With ORDER BY

Code Quiz
61

Handling NULL Values

Code Quiz
62

Column Aliases With AS

Code Quiz
63

Selecting Specific Columns by Name

Slides / Video
64

The SELECT Statement's Purpose

Slides / Video
65

Filtering with IS NULL / IS NOT NULL

Flashcard
66

IN Operator for Value Lists

Flashcard
67

Sorting by Multiple Columns

Flashcard
68

Logical Operators AND, OR, NOT

Flashcard
69

Column Aliases with AS

Flashcard
70

WHERE Clause for Filtering

Flashcard
71

Statement Termination with Semicolon

Flashcard
72

LIKE Operator and Wildcards

Flashcard
73

SELECT DISTINCT for Unique Values

Flashcard
74

LIMIT Clause to Restrict Rows

Flashcard
75

Ascending vs Descending Sort

Flashcard
76

Selecting All Columns with *

Flashcard
77

Selecting Specific Columns

Flashcard
78

String Literals and Quoting

Flashcard
79

ORDER BY for Sorting

Flashcard
80

Comparison Operators

Flashcard
81

FROM Clause and Table Name

Flashcard
82

BETWEEN Operator for Ranges

Flashcard
83

Case Sensitivity and Conventions

Flashcard
84

SELECT Statement Basic Syntax

Flashcard
Code QuizAdvanced

Filtering Rows With NULL Values

Spot why a WHERE clause comparing a column to NULL returns no rows.

Codesql
SELECT id, name, email
FROM users
WHERE email = NULL
ORDER BY name ASC;

This query should return users who have no email, but it returns zero rows. What is the bug?