SQL ch3 review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| A ____ is simply a question represented in a way that the DBMS can understand. | query
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| After you type the word SELECT, you list the columns that you want to include in the query results. This portion of the command is called? | SELECT clause
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| Next you type the word FROM followed by the name of the table that contains the data you need to query. This portion of the command is called? | FROM clause
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| Finally, after the word WHERE you list any conditions that apply to the data you want to retrieve. This optional portion of the command is called the? | WHERE clause
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| A ___ has this form: column name, comparison operator, and then either another column name or a value | simple condition
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| You form ___ ___ by connecting two or more simple conditions using the AND, OR and NOT operators. | compound conditions
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| A _____ ___ is a column that does not exist in the database but can be computed using data in the existing columns. | computed column
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| An ____ which consists of the IN operator followed by a collection of values, provides a concise way of phrasing certain conditions. | IN clause
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| In SQL, you specify the results order by using the __ clause. | ORDER BY
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| 34.The column on which data is to be sorted is called a ____ or simply a ___. | sort key, key
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| 34.When you need to sort data on two columns, the more important column is called the _____ (or the ___ ) and the less important column is called the ____ or the ____. | major sort key (primary sort key), minor sort key(secondary sort key)
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| 34.SQL has special functions, called ___ ___ to calculate sums, averages, counts, max values, and min values. | aggregate functions
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| 34.It is possible to place one query inside another. The inner query is called a ____; the subquery is evaluated __. | subquery, first
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| 34.The ____ is used to restrict the groups that will be included. | HAVING clause
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
kat1350
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