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Software ==>	SQL (129 exercises)
Topic ==>	Temporary tables and table variables (9 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Try both methods of creating Temporary tables, using INTO and CREATE

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file. Once you've done this:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

Using the INTO syntax, create a temporary table holding a count of the number of event names beginning with the same letter.

Use LEFT to return only the first letter from the EventName column, then GROUP BY this and perform a COUNT.

The problem with INTO is that it decides the data type of the column based on the current data. Try adding XZ as a first letter with a count of 57 using INSERT INTO:

-- Trying to add this data gives an error

INSERT INTO #EventsByLetter

values ('xz', 57)

This should generate an error:

Data type clash problem caused by INTO creation

The original data type is too small.

Add a statement at the top of your query to create a new table called #EventsByLetter with two columns:

Column	Type
First letter	varchar(2)
Number of events	int

Now change your SELECT statement so that it adds the first letter summary rows into this table, rather than creating a new table. The syntax of the command to insert rows into an existing table looks something like this:

INSERT INTO TableName (

Column1,

...,

ColumnN

)

SELECT (

Value1,

...,

ValueN

)

FROM ...

When you run this revised query, it should accommodate the xz insertion also, and allow you to display the final results:

Use ORDER BY to put the results into alphabetical order by the First Letter column.

Optionally save this as Tables of Temp-tation.sql, then close it down.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

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From:	FadwaEgypt
When:	26 Oct 21 at 10:02

Reply to FadwaEgypt

I thank Allah every day because I found this website, Awesome and perfect exercises, and not only here but also your youtube channel, and a lot of my friends in Egypt have known about it and study from it.

SO THANK YOU SO MUCH TO EVERYONE'S EFFORT IN MAKING THIS WEBSITE.

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Try both methods of creating Temporary tables, using INTO and CREATE

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