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Introduction to SQL

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

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

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Introduction to SQL
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

False
True

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Introduction to SQL
The result of a SQL SELECT statement is a ________ .

report
file
table
form

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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 > ALL (SELECT SALARY FROM EMPLOYEE);prints

9
5
10
0

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

1234
456789
6789
2345

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Introduction to SQL
The SQL WHERE clause:

limits the column data that are returned.
limits the row data are returned.
Neither A nor B are correct.
Both A and B are correct.

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