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INTRODUCTION TO SQL

Introduction to SQL
The SQL statementSELECT SUBSTR('123456789', INSTR('abcabcabc', 'b'), 4) FROM DUAL;

456789
6789
1234
2345

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Introduction to SQL
Which of the following group functions ignore NULL values?

All of these
COUNT
SUM
MAX

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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

10
5
0
9

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

23
gh
ab
bc

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Introduction to SQL
The SQL statementSELECT ROUND(45.926, -1) FROM DUAL;

prints 045.926
is illegal
prints 50
prints garbage

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