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ORDERED_BY: CHAR(30) Mngr AsstMngr Mngr AsstMngr Mngr AsstMngr AsstMngr Mngr Mngr Mngr
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Using the CURRENT_USER special value in the CD_ORDERS table
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and that value would be the current user identifier. If you do not specify a default value for the ORDERED_BY column, you can use the special value to insert the user. For example, the following INSERT statement inserts a row into the CD_ORDERS table:
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INSERT INTO CD_ORDERS VALUES ( 'Rhythm Country and Blues', 14, CURRENT_USER );
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When you execute the statement, a value representing the current user identifier (such as Mngr) is inserted into the ORDERED_BY column. To determine the extent to which you can use the special values, you should review the product documentation for your SQL implementation. You ll find that the ways in which you can use these values will vary from one implementation to the next; however, once you re comfortable with using special values in your implementation, you ll find them a useful tool as you become more proficient with programming SQL.
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Using Functions and Value Expressions
In this chapter, you learned about many of the functions and value expressions supported by SQL. Now you will try out these functions and expressions by querying data from the INVENTORY database. Specifically, you will create SELECT statements that contain the COUNT, MIN, SUM, SUBSTRING, and UPPER functions and ones that contain numerical, CASE, and CAST value expressions. You can download the Try_This_10.txt file, which contains the SQL statements used in this exercise.
Step by Step
1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. In the first statement, you will determine the number of unique ARTIST_NAME values in
the ARTISTS table. Enter and execute the following SQL statement:
SELECT COUNT(DISTINCT ARTIST_NAME) AS ARTISTS FROM ARTISTS;
Your query should return a count of 18.
3. In the next statement, you will determine the minimum number of CDs in stock, as listed in
the COMPACT_DISCS table. You ll name the column in the query results MIN_STOCK. Enter and execute the following SQL statement:
SELECT MIN(IN_STOCK) AS MIN_STOCK FROM COMPACT_DISCS;
Your query results should include only one column and one row, and show a value of 5. That means that five is the least number of CDs you have in stock for any one CD.
(continued)
SQL: A Beginner s Guide
4. Now you will determine the total number of CDs in stock. However, this time you will
group these totals according to the LABEL_ID values. Enter and execute the following SQL statement:
SELECT LABEL_ID, SUM(IN_STOCK) AS TOTAL FROM COMPACT_DISCS GROUP BY LABEL_ID;
Your query should return 10 rows, one for each LABEL_ID value. The TOTAL value for each row represents the total number of CDs for that particular LABEL_ID group.
5. In the preceding steps, you used set functions when querying data from the INVENTORY
database. You ll now try a couple of value functions. The first of these is SUBSTRING. In this SELECT statement, you ll extract data from the PLACE_OF_BIRTH column in the ARTISTS table. You want to extract eight characters, starting with the first character in the string. Enter and execute the following SQL statement:
SELECT ARTIST_NAME, SUBSTRING(PLACE_OF_BIRTH FROM 1 FOR 8) AS BIRTH_PLACE FROM ARTISTS;
Your query results should return 18 rows and include two columns: ARTIST_NAME and BIRTH_PLACE. The BIRTH_PLACE column contains the extracted values, which are based on the table s PLACE_OF_BIRTH column.
6. The next value function you ll try is the UPPER function. In this SELECT statement,
you ll convert the names of the CDs to all uppercase. Enter and execute the following SQL statement:
SELECT UPPER(CD_TITLE) AS CD_NAME FROM COMPACT_DISCS;
This statement should return 15 rows with only one column that lists the name of the CDs in the COMPACT_DISCS table. The CD titles should all be in uppercase.
7. Now you will move on to numeric value expressions. The next statement you try creates
two columns in the query results that double and triple the values in the IN_STOCK column of the COMPACT_DISCS table. However, the statement returns values only for those rows with an IN_STOCK value less than 25. Enter and execute the following SQL statement:
SELECT CD_TITLE, IN_STOCK, (IN_STOCK * 2) AS DOUBLED, (IN_STOCK * 3) AS TRIPLED FROM COMPACT_DISCS WHERE IN_STOCK < 25;
Your SELECT statement should return nine rows that each include IN_STOCK values that have been multiplied by 2 and by 3.
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