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Introduction to SQL

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

LEFT
LEN
JOIN
AVG

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

gh
23
bc
ab

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Introduction to SQL
Microsoft Access has become ubiquitous, and being able to program in Access is a critical skill.

True
False

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Introduction to SQL
The SQL -92 wildcards are ____ and ____ .

underscore(_); question mark (?)
asterisk (*); percent sign (%)
question mark (?); asterisk (*)
percent sign (%); underscore (_)

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Introduction to SQL
Table employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM employee WHERE SALARY > ALL (SELECT SALARY FROM EMPLOYEE);prints

0
10
9
5

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Introduction to SQL
A subquery in an SQL SELECT statement is enclosed in:

braces -- {...}.
CAPITAL LETTERS.
parenthesis -- (...) .
brackets -- [...].

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