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Introduction to SQL

Introduction to SQL
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

True
False

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Introduction to SQL
Which of the following is illegal?

SELECT SYSDATE - (SYSDATE - 2) FROM DUAL;
SELECT SYSDATE - (SYSDATE + 2) FROM DUAL;
None of these
SELECT SYSDATE - SYSDATE FROM DUAL;

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

DISTINCT
DIFFERENT
DISTINCTIVE
UNIQUE

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

form
table
file
report

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

gh
ab
23
bc

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