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Introduction to SQL

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

gh
ab
23
bc

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Introduction to SQL
Which one of the following sorts rows in SQL?

ORDER BY
GROUP BY
SORT BY
ALIGN BY

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Introduction to SQL
Which of the SQL statements is correct?

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

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Introduction to SQL
The Microsoft Access wildcards are ____ and ____ .

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

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Introduction to SQL
A subquery in an SQL SELECT statement:

can always be duplicated by a join.
can only be used with two tables.
cannot have its results sorted using ORDER BY.
has a distinct form that cannot be duplicated by a join.

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Introduction to SQL
Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables?

None
Data Definition Language(DDL)
Data Manipulation Language(DML)
Both of above

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