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Introduction to SQL

Introduction to SQL
Which of the following SQL commands can be used to add data to a database table?

UPDATE
INSERT
ADD
APPEND

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Introduction to SQL
SUM, AVG, MIN, and MAX can only be used with numeric columns.

True
False

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Introduction to SQL
When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

NOT IN only.
LIKE only.
Both IN and NOT IN.
IN only.

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Introduction to SQL
Which of the following is illegal?

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

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

ab
bc
gh
23

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Introduction to SQL
Which operator performs pattern matching?

None of these
BETWEEN operator
EXISTS operator
LIKE operator

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