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SQL Coding Questions & Answers

Practice 216 online coding questions and become a data expert.

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affirm afterpay airbnb amazon doordash dropbox ebay google linkedin lyft mobile netflix robinhood search engine snap social spotify tiktok twitter uber visa walmart

Chapter 2: Single Table Operation

ID Title Level FTPR Lecture
1 Top store for movie sales easy
30%
2.1
2 Top 3 movie categories by sales easy
47%
2.1
3 Top 5 shortest movies easy
53%
2.1
4 Staff without a profile image easy
67%
2.1
5 Monthly revenue easy
24%
2.2
6 Daily revenue in June, 2020 medium
11%
2.2
7 Unique customers count by month easy
19%
2.2
8 Average customer spend by month easy
22%
2.2
9 Number of high spend customers by month medium
4%
2.2
10 Min and max spend easy
13%
2.2
11 Actors' last name easy
24%
2.3
12 Actors' last name ending in 'EN' or 'RY' easy
30%
2.3
13 Actors' first name medium
13%
2.3
14 Good days and bad days hard
4%
2.3
15 Fast movie watchers vs slow watchers hard
5%
2.3
16 Staff who live in Woodridge easy
72%
2.1
17 GROUCHO WILLIAMS’ actor_id easy
65%
2.1
18 Top film category easy
25%
2.2
19 Most productive actor medium
14%
2.2
20 Customer who spent the most medium
15%
2.2
21 Customer who rented the most medium
20%
2.2
22 Average cost per rental transaction easy
43%
2.3
23 Average spend per customer in Feb 2020 easy
16%
2.2
24 Films with more than 10 actors medium
20%
2.3
25 Shortest film easy
46%
2.3
26 Second shortest film easy
29%
2.3
27 Film with the largest cast easy
27%
2.3
28 Film with the second largest cast medium
25%
2.3
29 Second highest spend customer medium
16%
2.3
30 Inactive customers in May easy
21%
2.3
31 Movies that have not been returned easy
27%
2.3
32 Unpopular movies hard
16%
2.3
33 Returning customers medium
8%
2.3
34 Stocked up movies easy
28%
2.3
35 Film length report easy
26%
2.3
81 How many people searched on new year's day search engine easy
24%
2.2
82 The top search query on new year's day search engine easy
12%
2.2
84 Click through rate on new year's day search engine medium
10%
2.2
85 Top 4 queries based on click through rate on new year's day search engine hard
6%
2.2
86 Top song in the US spotify easy
19%
2.2
89 Top 5 artists in the US spotify medium
11%
2.2
92 Acceptance rate first week of 2021 spotify easy
14%
2.1
93 number of sales for each product this month amazon easy
19%
2.2
95 Candidate products for subscription amazon hard
11%
2.2
96 Overall acceptance rate social easy
13%
2.2
97 Social influencer social easy
10%
2.2
98 Most popular user social easy
29%
2.2
101 Average number of visits per user mobile easy
12%
2.2
102 Histogram by visit session duration mobile hard
12%
2.3
106 Mobile vs. web mobile medium
9%
2.2
107 Customer count by platform mobile medium
19%
2.2
111 Second most popular product amazon medium
14%
2.1
112 Top 3 customers amazon easy
30%
2.2
124 Active restaurants by city uber easy
36%
2.2
125 Active restaurants with fewer than 5 trips per city uber easy
14%
2.2
126 Top 3 restaurants uber hard
9%
2.1
128 Completion rate uber easy
23%
2.2
130 Newly created accounts affirm easy
34%
2.2
131 Churned accounts affirm hard
10%
2.3
132 Top 3 trending countries affirm medium
8%
2.2
133 Small departments robinhood easy
44%
2.2
134 Expensive departments robinhood medium
32%
2.2
136 Extremely late orders doordash easy
5%
2.3
138 Happy restaurants doordash easy
10%
2.3
143 Customer purchase report afterpay easy
15%
2.2
146 Purchase by platform afterpay easy
13%
2.2
149 fans by video category social easy
30%
2.2
151 Salary report dropbox easy
16%
2.3
152 Salary analysis dropbox easy
23%
2.1
153 Project ROI dropbox easy
18%
2.2
154 Rideshare completion rate lyft easy
22%
2.2
155 Driver with the highest cancellation rate lyft easy
22%
2.3
156 Cancellation rate by unbanned users lyft hard
14%
2.3
159 Transaction volume from suspended accounts ebay easy
51%
2.2
160 Sellers with no sales by day ebay hard
7%
2.3
161 Biggest sales day ebay easy
19%
2.2
163 Average number of orders per brand walmart easy
36%
2.2
164 Orders distribution by brand walmart easy
22%
2.2
167 Top country in video streaming tiktok easy
24%
2.2
169 Same day streams tiktok easy
29%
2.2
170 Top 3 countries by average watch time tiktok easy
10%
2.2
171 Binge watches tiktok easy
19%
2.2
173 User Popularity Percentage social medium
5%
2.2
174 Closed accounts social easy
18%
2.2
175 Employees' email account amazon easy
11%
2.1
176 Employees' annual bonus amazon easy
11%
2.3
177 Purchases by platform report amazon medium
9%
2.3
178 Members who worked at both Microsoft and Google linkedin medium
36%
2.3
181 Users who watched less than one hour of Netflix netflix easy
23%
2.2
183 Top 5 movies by number of watchers netflix easy
33%
2.2
184 Top 5 movies by watch time netflix medium
7%
2.2
185 Top 5 non-English contents by watch time netflix medium
53%
2.2
186 Average comments per question google easy
50%
2.2
187 Comment distribution at Google Forum google easy
50%
2.2
190 Twitter campaign spend report twitter hard
50%
2.2
192 Number of replies to the original tweet by group twitter medium
100%
2.2
193 Difference of replies by testing groups twitter medium
100%
2.2
196 User segments report snap hard - 2.2
197 Students who didn't finish all subjects snap easy - 2.2
198 Average score per subject snap easy - 2.2
200 Last week's absent students snap medium - 2.1
202 Monthly active paid subscriptions subscription easy - 2.2
204 AB testing sanity check search engine easy - 2.2
205 Search results recall search engine medium - 2.2
206 Search results recall by testing group search engine medium - 2.2
207 Results shown rate by group search engine easy - 2.2.1
209 Card issuer customers count visa easy - 2.2
210 Issuer and merchant report visa easy - 2.1
211 High spenders by issuer visa easy - 2.1
212 Top issuing bank by category visa hard - 2.1
214 D30 retention rate gaming hard - 2.2
215 Monthly active users gaming hard - 2.2
216 Highest spender gaming hard - 2.2

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