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In this statement, the IN predicate compares the values in the CD_TITLE column of the TITLE_TYPES table with the value returned by the subquery. The subquery is a simple SELECT statement that returns data from the TITLES_INVENTORY table. The subquery here works the same way as you saw in earlier SELECT statement examples. In this case, the subquery returns a value of Both Sides Now. This value is then used to determine which row in the TITLE_TYPES table to update. Once this row is determined, the CD_TYPE value is changed to Folk. Subqueries are not limited to the WHERE clause of an UPDATE statement. You can also use a subquery in the SET clause to provide a value for the identified column. For example, suppose you want to once again update the Both Sides Now row that was inserted in the preceding INSERT statement example. You can pull a value from the TITLES_INVENTORY table to use as the new value for the TITLE_TYPES table, as shown in the following UPDATE statement:

UPDATE TITLE_TYPES SET CD_TITLE = ( SELECT TITLE FROM TITLES_INVENTORY WHERE TITLE_ID = 108 ) WHERE CD_TITLE = 'Both Sides Now';

Execute sp_attach_db 'Employees', 'c:\mssql7\data\Emp_data.mdf'

12. Oracle:

Notice that, instead of specifying a value in the SET clause (to the right of the equals sign), you can specify a subquery. The subquery returns a value of Both Sides Now and inserts that value into the TITLE_TYPES table.

Note that if a database uses multiple files, you can choose to attach or detach one or more of them within the same command. However, if you remove only some of the data files, you might not be able to access all the objects that are part of the database. Table 7-4 provides a summary of the commands and syntax for attaching and detaching databases.

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In the preceding example, all we ve done is write the same value over the existing one. The purpose of this statement is only to demonstrate how a subquery can be used in a SET clause. Even if a new value were being written into the row, the principles would be the same. For example, if the title had changed in the TITLES_INVENTORY table, the preceding statement would update the title in the TITLE_TYPES table.

SELECT MOVIE_ID, MOVIE_TITLE FROM MOVIE WHERE MOVIE_TITLE LIKE '%' || CHR(39) || '%';

12:

An installation of SQL Server 7 assumes the name of the machine onto which it is installed. For example, if my computer is named WORKSTATION1, the name of the SQL Server installation is also WORKSTATION1. So, what happens when the computer name is changed SQL Server 7 does not automatically update its internal settings to reflect the change, and you will receive an error message on startup stating that the SQL Server installation is corrupt. Although the error message might be alarming, you should know that your information is safe. The only problem is that the SQL Server services cannot au-

A DELETE statement is similar to an UPDATE statement, in terms of how a subquery can be used in the WHERE clause. You simply include a predicate that contains a subquery. In the following example, I delete the Both Sides Now row that I modified in the previous UPDATE statement example. To determine which row to delete, I use a subquery to return the appropriate TITLE value from the TITLES_INVENTORY table:

DELETE TITLE_TYPES WHERE CD_TITLE IN ( SELECT TITLE FROM TITLES_INVENTORY WHERE TITLE_ID = 108 );

7:

Microsoft SQL Server:

As you would expect, the subquery returns the value of Both Sides Now. The IN predicate compares this value to the values in the CD_TITLE column of the TITLE_TYPES table. Every row with matching values is deleted. In this case, only one row has a CD_TITLE value of Both Sides Now, so that is the row that is deleted.

Function Attaches the data files of a database to a server; transaction log files are reattached automatically. Detaches database and transaction log data files from SQL Server; the skipchecks option instructs SQL Server not to update the statistics for the database.

Try This 12-1

SELECT MOVIE_ID, MOVIE_TITLE FROM MOVIE WHERE MOVIE_TITLE LIKE '%' + CHAR(39) + '%';

In this chapter, I discussed how you can use subqueries to query and modify data. The subqueries we looked at, for the most part, relied on the use of predicates to define the subquery condition. In this Try This exercise, you will create a number of SELECT statements that include WHERE clauses. Those clauses will each include a predicate that defines a subquery, allowing you to access data from more than one table. You will also modify data by using an UPDATE statement that contains subqueries in the SET clause and the WHERE clause. For this exercise, as with previous Try This exercises, you will be using the INVENTORY database. You can download the Try_This_12.txt file, which contains the SQL statements used in this exercise.

Syntax sp_attach_db [@dbname =] dbname , [@filename1 =] filename_n [,...16]

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