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INTRODUCTION TO SQL

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

6789
456789
1234
2345

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

COUNT
MAX
All of these
SUM

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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
9
0

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

gh
bc
23
ab

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

prints 50
prints garbage
is illegal
prints 045.926

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