SQL Commands and Operators Quiz
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Questions and Answers

What SQL command is specifically used to query a database?

  • UPDATE
  • INSERT
  • SELECT (correct)
  • DELETE

Which operator would you use to determine if a specific column contains any non-null values?

  • IS NOT NULL (correct)
  • IS NULL
  • NOT EXISTS
  • HAS VALUE

What is the purpose of the 'ORDER BY' clause in a SQL statement?

  • To group data based on a column
  • To eliminate duplicate rows
  • To limit the number of rows returned
  • To sort the result set in a particular order (correct)

Which SQL command should be used to include a specific range of values in a query?

<p>BETWEEN (C)</p> Signup and view all the answers

When constructing a SELECT statement, what follows the SELECT keyword?

<p>Asterisk * (C)</p> Signup and view all the answers

Which clause is used to filter groups after the grouping operation in SQL?

<p>HAVING (D)</p> Signup and view all the answers

How can Mallory express her SQL query to show only items in the COLOR column that match specific values?

<p>WHERE COLOR IN ('Red', 'Pink', 'White') (C)</p> Signup and view all the answers

What keyword indicates the end of a SQL command?

<p>; (D)</p> Signup and view all the answers

Flashcards

SQL command terminator

A semicolon (;) is used to mark the end of a SQL command, signaling to the database that the command is complete and ready for execution.

SELECT * FROM

The SELECT * FROM command retrieves all columns and rows from a specified table in a database. This allows you to view the complete contents of the table.

Null value

In SQL, a null value represents the absence of data or an unknown value. It's not the same as an empty string or zero.

WHERE clause

The WHERE clause is used to filter rows in a SQL query based on specific conditions, only returning rows that meet the criteria.

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ORDER BY clause

The ORDER BY clause sorts the results of a SQL query in ascending or descending order based on one or more columns.

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GROUP BY clause

The GROUP BY clause is used to group rows together based on similar values in a specified column. It's used for aggregating data and performing calculations on groups.

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IN operator

The IN operator is used in SQL queries to check if a value exists within a list of values.

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BETWEEN operator

The BETWEEN operator in SQL is used to select values within a range, including the starting and ending values.

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Study Notes

SQL Commands and Operators

  • SQL commands are terminated by a semicolon (;).
  • SELECT * FROM VACATION_PACKAGES; displays all data in the VACATION_PACKAGES table.
  • Primary keys cannot be NULL.
  • SELECT * FROM table_name; displays all rows and columns from a table.
  • * (asterisk) represents all columns in a SELECT statement.
  • IS NULL represents empty or unknown values in SQL.
  • SELECT is the fundamental command for querying databases.
  • ORDER BY clause sorts data within rows.
  • You can use both WHERE and HAVING clauses (if involving groups). WHERE filters before grouping, HAVING filters groups.
  • GROUP BY groups rows with similar values, not sorts them.
  • ORDER BY UNIT_PRICE sorts results in ascending UNIT_PRICE order.
  • Nested queries (queries within a query) are possible.
  • SELECT statements do not always require a WHERE clause.
  • IS NOT NULL finds rows where a specific column is not NULL.
  • IN operator selects rows matching specific values in a list (e.g., "Red", "Pink", "White").
  • BETWEEN operator selects values within a specified range (inclusive).
  • COUNT determines the number of rows in a table.
  • SUM calculates the total of values in a column.
  • The base SELECT structure involves SELECT, FROM, and potentially WHERE.
  • Various arithmetic operators (+, -, *, /, etc.) can refine SELECT statements.

Wildcards and Pattern Matching

  • LIKE operator uses wildcards for pattern matching (e.g., %).
  • % is a wildcard representing any character sequence (zero or more characters).

NULL Values

  • IS NULL finds rows containing null values in a specified column.

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Description

Test your knowledge on SQL commands and operators with this quiz! Learn how to effectively use SELECT, INSERT, UPDATE, and more to manipulate your data. Understand the nuances of clauses like WHERE, HAVING, and ORDER BY to enhance your database queries.

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