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Introduction to SQL

Introduction to SQL
The SELECT command, with its various clauses, allows users to query the data contained in the tables and ask many different questions or ad hoc queries.

True
False

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Introduction to SQL
Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.

True
False

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Introduction to SQL
SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions.

False
True

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

ab
gh
23
bc

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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
SELECT Username, Password FROM Users
None of these

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Introduction to SQL
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

False
True

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