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Applying text functions

From: Access 2010: Queries in Depth

Video: Applying text functions

As with the mathematical operations that we looked at in the previous movie, Access provides us with a few ways that we can modify and combine text-based data types. For instance, we could extract a person's initials from a table of first and last names. We can do this using what Access calls string functions. The key here is to think about your text-based data as a simple string of characters or individual letters and we'll use their positions to help extract the pieces that we need. Let's go under the Create tab and we'll create a new query in Design view. This time we'll look at our Employees table. We'll double-click to add it and we can close Show Table.

Applying text functions

As with the mathematical operations that we looked at in the previous movie, Access provides us with a few ways that we can modify and combine text-based data types. For instance, we could extract a person's initials from a table of first and last names. We can do this using what Access calls string functions. The key here is to think about your text-based data as a simple string of characters or individual letters and we'll use their positions to help extract the pieces that we need. Let's go under the Create tab and we'll create a new query in Design view. This time we'll look at our Employees table. We'll double-click to add it and we can close Show Table.

We'll add the FirstName and LastName to our query. In the third field, we'll invoke our Expression Builder by right-clicking and selecting Build. Now the Expression Builder will help us build our String functions. Let's build an expression that will combine the first name and the last name into a single column. We'll go into our TwoTrees database, we'll look through our tables, and we'll find our Employees table. Let's grab the FirstName by double-clicking on it. Now to join two text fields, you'll use the concatenate symbol which is the ampersand or Shift+7 on your keyboard.

This will join the FirstName to whatever we put after it. Let's go ahead and double-click on LastName. Now we have a calculated field which will take the characters in the FirstName and it will append the characters from the LastName to it. Now in order to make this legible, we want to add a space in between the two. We could do that by inserting a space between here, wrapping the space in quotation marks, and using another concatenate symbol. So now we have the characters in the FirstName, joined to a space, joined to the characters in the LastName.

Let's go ahead and say OK and run this query and we'll see that we have the dirst and last name being combined into a third column. Let's go back into Design view, right- click on this field, and return to the build. Okay, so let's highlight this and we'll delete this expression out. Let's take a look at some of the built-in functions that can help us with text data. If we go into our Functions in the Functions Built-In to Access, we have a whole category called Text and there's a long list of expressions that apply to text fields.

Let's take a look at the Left expression. Down in the bottom of the Expression Builder, Access tells us that the Left function will extract a certain number of characters from the left side of a string. This will allow us to extract the employee's initials from their First and LastName fields. Let's double-click on Left to add it to our expression and we can see that we have two required components. The first is a string, what characters are we going to extract from. Here we're going to feed it our FirstName field from the tables, Employees' FirstName.

The second requirement is how many characters you want to extract. We just want the first one so I'll type 1. Let's go ahead and do another one to join this to the LastName. We'll use our concatenate and then we'll add another function for Left. Built-In Functions > Text > Left. This time we'll feed it our LastName field from the Tables > Employees, and LastName. Again, we only want the first character.

So my finished expression says that we're going to extract the left 1 character from the FirstName and then we're going to add to it the left 1 character from the LastName. Let's go ahead and say OK and run our query to see the results. Now we have a field that shows the employee's initials from the First and LastName fields. Now as you saw in the Expression Builder, there is a whole long list of expressions that we can use that apply to text fields. I would encourage you to use the Expression Builder not only as a tool to help you build expressions, but as a tool you use to learn about expressions.

By going through the list, you can explore some of the other functions and see how that may work. By combining some of these functions in our queries, we can come up with some interesting new ways to present our results. When feeding our query results into a report or simply reviewing the data sheet, the appropriate and creative use of string functions can increase the legibility of our data.

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This video is part of

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Access 2010: Queries in Depth

46 video lessons · 13613 viewers

Adam Wilbert
Author

 
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  1. 9m 9s
    1. Welcome
      1m 10s
    2. Using the exercise files
      41s
    3. Introducing the database
      4m 29s
    4. Previewing the course
      2m 49s
  2. 17m 17s
    1. Understanding queries
      3m 31s
    2. Following naming conventions and best practices
      2m 56s
    3. Using the Query Wizard
      5m 21s
    4. Exploring the design interface
      5m 29s
  3. 26m 39s
    1. Defining criteria
      5m 40s
    2. Understanding comparison operators
      3m 19s
    3. Defining the column headers
      2m 49s
    4. Exploring the property sheet
      7m 32s
    5. Printing query results
      2m 41s
    6. Working with joins
      4m 38s
  4. 14m 14s
    1. Understanding parameter queries
      4m 27s
    2. Obtaining parameters from forms
      5m 17s
    3. Creating a combo box
      4m 30s
  5. 23m 24s
    1. Understanding the Totals field
      5m 31s
    2. Creating aggregate calculations
      3m 31s
    3. Exploring the Expression Builder interface
      4m 28s
    4. Using mathematical operators
      5m 46s
    5. Applying text functions
      4m 8s
  6. 24m 23s
    1. Understanding dates as serial numbers
      2m 42s
    2. Specifying a range of dates or times
      3m 47s
    3. Formatting dates
      4m 31s
    4. Using other Date/Time functions
      3m 47s
    5. Defining today's date
      2m 41s
    6. Calculating time intervals
      6m 55s
  7. 20m 9s
    1. Introducing the conditional IIf function
      2m 57s
    2. Creating an IIf function
      7m 31s
    3. Nesting IIf functions
      4m 57s
    4. Using the Switch function
      4m 44s
  8. 20m 41s
    1. Understanding the reporting tool
      2m 13s
    2. Building the form
      6m 57s
    3. Building the query
      5m 4s
    4. Building the report
      3m 30s
    5. Finalizing the reporting tool
      2m 57s
  9. 25m 37s
    1. Finding duplicate records
      2m 17s
    2. Identifying unmatched records
      2m 29s
    3. Creating crosstab results
      2m 57s
    4. Creating backups
      1m 29s
    5. Creating update queries
      3m 22s
    6. Making, deleting, and appending records
      5m 36s
    7. Uniting tables
      3m 16s
    8. Embedding SQL code in queries
      4m 11s
  10. 1m 0s
    1. Next Steps
      1m 0s

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