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Introduction to SQL

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

True
False

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Introduction to SQL
The SQL statementSELECT SUBSTR('abcdefghij', INSTR('123321234', '2', 3, 2), 2) FROM DUAL;prints

bc
ab
23
gh

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Introduction to SQL
'AS' clause is used in SQL for

Selection operation.
Join operation.
Projection operation.
Rename operation.

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Introduction to SQL
Which of the following is the original purpose of SQL?

To define the data structures
All of these
To specify the syntax and semantics of SQL manipulation language
To specify the syntax and semantics of SQL data definition language

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Introduction to SQL
Select the right statement to insert values to the student table.

INSERT VALUES INTO student (
INSERT INTO student VALUES (
INSERT student VALUES (
INSERT VALUES (

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Introduction to SQL
A subquery in an SQL SELECT statement:

can always be duplicated by a join.
cannot have its results sorted using ORDER BY.
has a distinct form that cannot be duplicated by a join.
can only be used with two tables.

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