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Introduction to SQL

Introduction to SQL
A SELECT statement within another SELECT statement and enclosed in square brackets ([...]) is called a subquery.

True
False

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Introduction to SQL
If you are going to use a combination of three or more AND and OR conditions, it is often easier to use the NOT and NOT IN operators.

False
True

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Introduction to SQL
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

False
True

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Introduction to SQL
The FROM SQL clause is used to...

specify what table we are selecting or deleting data FROM
specify search condition
specify range for search condition
None of these

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Introduction to SQL
The SELECT command, with its various clauses, allows users to query the data contained in the tables and ask many different questions or ad hoc queries.

False
True

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Introduction to SQL
Table employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM employee WHERE SALARY > ALL (SELECT SALARY FROM EMPLOYEE);prints

5
9
10
0

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