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Introduction to SQL

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

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

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

2345
456789
6789
1234

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Introduction to SQL
Which of the following command makes the updates performed by the transaction permanent in the database?

COMMIT
TRUNCATE
DELETE
ROLLBACK

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

is illegal
prints 045.926
prints garbage
prints 50

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Introduction to SQL
The SQL WHERE clause:

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

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Introduction to SQL
A SELECT statement within another SELECT statement and enclosed in square brackets ([...]) is called a subquery.

True
False

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