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1. In SQL, what keyword is used to retrieve data from one or more tables?
COLLECT
EXTRACT
SELECT
FETCH
jQuery
Php

Difficulty

1900
low
2. What is the correct order of the clauses in a basic SQL SELECT statement?
FROM, WHERE, SELECT, GROUP BY, HAVING, ORDER BY
SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY
ORDER BY, HAVING, GROUP BY, WHERE, FROM, SELECT
FROM, SELECT, WHERE, GROUP BY, ORDER BY, HAVING
jQuery
Php

Difficulty

3700
high
3. In SQL, what does the term "alias" refer to?
A temporary table created in a query
A nickname for a column or table
An aggregate function
A reserved keyword
jQuery
Php

Difficulty

3300
high
4. What SQL keyword is used to eliminate duplicate rows from the result set?
UNIQUE
DISTINCT
SINGLE
DIFFERENT
jQuery
Php

Difficulty

3500
high
5. What is the correct syntax for commenting in SQL?
// This is a comment
-- This is a comment
/* This is a comment */
# This is a comment
jQuery
Php

Difficulty

2300
medium
6. In SQL, what is the correct way to represent a string literal?
"Hello, World!"
'Hello, World!'
`Hello, World!`
[Hello, World!]
jQuery
Php

Difficulty

2300
medium
7. What SQL clause is used to combine rows from two or more tables based on a related column?
UNION
JOIN
MERGE
COMBINE
jQuery
Php

Difficulty

3000
medium
8. What is the correct way to represent a comment in SQL Server that spans multiple lines?
/* This is a comment */
-- This is a comment
# This is a comment #
// This is a comment //
jQuery
Php

Difficulty

2600
medium
9. What is the purpose of the SQL "IN" operator?
To filter results based on a condition
To check for NULL values
To perform wildcard pattern matching in strings
To specify multiple values in a WHERE clause
jQuery
Php

Difficulty

3300
high
10. In SQL, what is the purpose of the "IS NULL" condition?
To check if a value is equal to NULL
To filter results based on a condition
To insert NULL values into a table
To compare two columns for equality
jQuery
Php

Difficulty

3500
high
11. What SQL clause is used to update existing records in a table?
MODIFY
CHANGE
UPDATE
ALTER
jQuery
Php

Difficulty

2800
medium
12. What is the purpose of the SQL "AS" keyword?
To filter results based on a condition
To specify the columns by which the results should be sorted
To create an alias for a column or table
To limit the number of rows returned by a query
jQuery
Php

Difficulty

2700
medium
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