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4. The WHERE clause specifies the criteria according to which rows are retrieved.

5. The DESCRIBE command is used to view the schema of an existing table.

D. Answer the following questions:
1. Define the SELECT command.

2. What do you understand by operators?

3. List any two constraints used in MySQL.

4. Differentiate between primary key and foreign key.

5. Explain the use of Where clause in SQL.

21 st
COMPETENCY-BASED QUESTIONS Century #Creativity
Skills #Critical Thinking
1. Madhurima is working on her organisation’s database. She set a key on a column and now that column
does not accept duplicate or null values. Which type of key has she applied?
2. Janvi made a table with states and capitals using SQL. She wants to display the capital

of a particular state. Which SQL clause should she use to set this condition?

LAB LEARNING 21 st #Creativity
Century
Skills #Technology Literacy
1. Consider the following PLAYERS table:
Table: PLAYERS
Player_ID Name Sport Country Age
S001 Virat Cricket India 35
S002 Ronaldo Football Portugal 39
S003 Sindhu Badminton India 28
S004 Messi Football Argentina 37
S005 Mary Boxing India 41

Now, write SQL commands for the following:
(a) Create a PLAYERS table under the Sports database.
(b) Display details of all the Indian players.
(c) Show the names of all the football players.

(d) Change the country of player “Ronaldo” to “Brazil”.

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