Introduction to SQL
Which of the following is illegal?

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

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Introduction to SQL
The wildcard in a WHERE clause is useful when?

An exact match is not possible in a SELECT statement.
An exact match is necessary in a SELECT statement.
An exact match is not possible in a CREATE statement.
An exact match is necessary in a CREATE statement.

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