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Introduction to SQL

Introduction to SQL
Which of the following is valid SQL for an Index?

CREATE INDEX ID;
CHANGE INDEX ID;
REMOVE INDEX ID;
ADD INDEX ID;

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Introduction to SQL
The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows.

True
False

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Introduction to SQL
Which of the SQL statements is correct?

None of these
SELECT Username, Password FROM Users
SELECT Username AND Password FROM Users
SELECT Username, Password WHERE Username = 'user1'

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Introduction to SQL
Which of the following is illegal?

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

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Introduction to SQL
Let the statementSELECT column1 FROM myTable;return 10 rows. The statementSELECT ALL column1 FROM myTable;will return

None of these
exactly 10 rows
less than 10 rows
more than 10 rows

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Introduction to SQL
Which of the following is a SQL aggregate function?

JOIN
AVG
LEN
LEFT

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