SQL | Temporary tables and table variables exercise | Temporary tables - first letter count of events

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Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Temporary tables and table variables  (9 exercises)
Level ==> Relatively easy
Subject ==> SQL training
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  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. Execute this script.

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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:











FROM ...

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

CREATE temp table then INSERT values

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.
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26 Oct 21 at 10:02

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