SQL Problem Solving: Calculating Device Uptime Duration | Step-by-Step Tutorial
Join us in this SQL problem-solving session as we tackle a real-world challenge involving devices' on-off states and durations. In this tutorial, we'll use SQL's powerful CASE and GROUP BY clauses to determine the total duration for which each device was in the "ON" status. Follow along step-by-step to master these SQL techniques.
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Table creation & insertion script:
CREATE TABLE electric_items(
id int,
type varchar(20),
status varchar(20),
time_res int
);
INSERT INTO electric_items VALUES(1,'light','on',100),
(1,'light','off',110),
(2,'fan','on',80),
(2,'fan','off',120),
(1,'light','on',150),
(1,'light','off',200);
#sql #interview #groupby #case
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