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Introduction to SQL

Introduction to SQL
Which of the following must be enclosed in double quotes?

All of these
Column Alias
Dates
Strings

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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 > ANY (SELECT SALARY FROM EMPLOYEE);prints

9
10
5
0

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Introduction to SQL
What is the meaning of LIKE '%0%0%'

Feature has more than two 0's
Feature begins with two 0's
Feature has two 0's in it, at any position
Feature ends with two 0's

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

ab
bc
23
gh

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Introduction to SQL
Which of the following SQL commands is used to retrieve data?

SELECT
DELETE
JOIN
INSERT

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Introduction to SQL
Count function in SQL returns the number of

values.
distinct values.
columns.
groups.

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