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Introduction to SQL

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

JOIN
SELECT
DELETE
INSERT

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Introduction to SQL
Which one of the following sorts rows in SQL?

GROUP BY
ALIGN BY
ORDER BY
SORT BY

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Introduction to SQL
The SQL -92 wildcards are ____ and ____ .

asterisk (*); percent sign (%)
underscore(_); question mark (?)
percent sign (%); underscore (_)
question mark (?); asterisk (*)

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

bc
gh
ab
23

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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
0
10
5

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Introduction to SQL
Which SQL keyword is used to retrieve only unique values?

UNIQUE
DISTINCT
DIFFERENT
DISTINCTIVE

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