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Notice that the CD_TITLE and TITLE columns are still equated with each other. This statement produces the same results as the statement that included the correlated subquery, only the SQL implementation is not being forced to reprocess a subquery for each row returned by the outer statement. Instead, the WHERE clause merely takes the results returned by the FROM clause and applies the search conditions defined in the two predicates. For more information about join operations, see 11.

Dim Names(10) As String, Values(10, 20) As Single, k(10) As Integer Dim a As Single, b As Single, m As Integer, n As Integer . . . . . Names(3) = "Aaron" values(8, 5) = 5.5 Names(i) = "Susan" values(m, n) = -3.2 Names(k(i)) = "Martin" values(m - 1, n + 3) = m + n Names(2 * a - b) = "Gail" values(a + b, a - b) = 3 * a Names(sqr(a ^ 2 + b ^ 2)) = "Sharon" values(abs(a + b), abs(a - b)) = a + b

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Up to this point, we have looked at SELECT statements that include only one subquery. However, a SELECT statement can contain multiple subqueries. The SQL:2006 standard does not limit the number of subqueries that can be included in a statement, although practical application, performance, and the limitations of the SQL implementation all play an important role in determining what a reasonable number might be. Make certain that you refer to the documentation for your SQL implementation to determine what restrictions might apply to the use of subqueries. One way you can include multiple subqueries in a SELECT statement is to include them as different components of the statement. For example, your WHERE clause might include two predicates, each of which contains a subquery. Another way in which multiple subqueries can be included in a SELECT statement is to nest one subquery inside the other. These are the types of subqueries we ll look at in this section. A nested subquery is one that is a component of another subquery. The outer subquery acts as a primary SELECT statement that includes a subquery within one of its clauses. In most cases, the nested subquery will be part of a predicate in the WHERE clause of the outer subquery. Let s take a look at an example to help clarify this concept. The example uses the DISC_INVENTORY, DISC_ARTISTS, and DISC_TYPES tables, shown in Figure 12-3.

12:

DISC_INVENTORY DISC_NAME: VARCHAR(60) ARTIST_ID: STOCK_AMOUNT: INT INT 12 24 17 9 22 19 18 25 17 11 13

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DISC_ARTISTS ARTIST_ID: ARTIST_NAME: INT VARCHAR(60) 101 102 103 104 105 106 107 108 109 Joni Mitchell Jennifer Warnes B.B. King Bonnie Raitt DISC_TYPE_ID: INT 10 12 11 10

Some of the subscripts may not be integer valued as written. In such cases, the noninteger values will automatically be rounded. Suppose, for example, the numeric expression (2 * a - b) has a value of 4.2. Then the subscripted variable Names(2 * a - b) will be interpreted as Names(4). Similarly, if (2 * a - b) has a value of 4.7, then the subscripted variable Names(2 * a - b) will be interpreted as Names(5).

DISC_TYPES DISC_TYPE_ID: DISC_TYPE_NAME: INT CHAR(20) 10 11 12 13 14 15 16 17 18 Popular Blues Folk Rock Classical New Age Classic Pop Country Soundtrack

Famous Blue Raincoat 102 Blue Court and Spark Past Light Fundamental Blues on the Bayou 101 101 105 104 103

Longing in Their Hearts 104 Luck of the Draw Deuces Wild Nick of Time Both Sides Now 104 103 104 101

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