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Function Starts SQL Server in the master database. Starts SQL Server in the error log file. Starts SQL Server in the transaction log file for the master database. Prevents SQL Server from starting as a service. Starts SQL Server in Fail-Safe mode.

You state that a SELECT clause can include a subquery. How would you include the subquery in that clause You can include the subquery in a SELECT clause just as you would a column name. The values returned from the subquery are inserted in the query results in the same way column values would be inserted. For example, you can insert a subquery in a SELECT clause of a statement that is used to query the CD_STOCK table (shown in Figure 12-1). The subquery pulls data from the CD_ARTISTS table, as shown in the following example:

20. For Oracle:

SELECT CD_TITLE, ( SELECT ARTIST_NAME FROM CD_ARTISTS a WHERE s.CD_TITLE = a.TITLE ) AS ARTIST, STOCK FROM CD_STOCK s;

Notes If this option is not specified, the installation default settings from the Registry are used. If this option is not specified, the installation default settings from the Registry are used.

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In the main part of this statement, values are pulled from the CD_TITLE and STOCK columns. In addition to these values, a list of artists is returned by the subquery. The artists names are matched up to their CDs by using a comparison predicate to compare values in the CD_TITLE and TITLE columns. When using a subquery in a SELECT clause, you must be careful not to create a subquery that returns only one value when multiple values are needed. When you return only one value, that value might be inserted into all rows returned by the main SELECT statement, depending on how you ve constructed your query.

SELECT MOVIE_ID, SUM(RENTAL_FEE + NVL(LATE_OR_LOSS_FEE,0)) AS TOTAL_FEES FROM MOVIE_RENTAL GROUP BY MOVIE_ID;

So far, we have looked at subqueries that can return one or more rows of data. This is fine in many circumstances; however, there might be times when you want your subquery to return only one value so that you can compare the values in one column with a single subquery value. In these cases, you can use comparison operators.

This can decrease the time it takes to start SQL Server, but using it generally isn t a good idea, because it is more difficult to administer and monitor. Uses the minimal options required to start SQL Server; can be useful when system-wide parameters have been configured incorrectly.

As you learned in 9, the comparison operators include equal to (=), not equal to (<>), less than (<), greater than (>), less than or equal to (<=), and greater than or equal to (>=). For example, let s take another look at the RETAIL_PRICES and SALES_PRICES tables (shown in Figure 12-2). Suppose you want to retrieve data from the RETAIL_PRICES table. You want the R_PRICE values to equal the maximum price listed in the S_PRICE column of the SALES_PRICES table. The following query allows you to return the necessary data:

Table 7-3.

SELECT CD_NAME, R_PRICE FROM RETAIL_PRICES WHERE R_PRICE = ( SELECT MAX(S_PRICE) FROM SALES_PRICES );

For Microsoft SQL Server and Sybase Adaptive Server:

Notice that the subquery returns only one value, which is 16.99 in this case. As a result, only rows with an R_PRICE value of 16.99 are returned by the SELECT statement, as shown in the following query results:

7:

CD_NAME ----------------------------Famous Blue Raincoat Patsy Cline: 12 Greatest Hits R_PRICE ------16.99 16.99

SELECT MOVIE_ID, SUM(RENTAL_FEE + ISNULL(LATE_OR_LOSS_FEE,0)) AS TOTAL_FEES FROM MOVIE_RENTAL GROUP BY MOVIE_ID;

You do not have to use an aggregate function (such as MAX) to return a single value in a subquery. For example, the subquery s WHERE clause might include a condition that will return only one value. The important point to remember is that you must be sure that your subquery returns only one value; otherwise, you will receive an error when using a comparison operator. However, if you ve set up your subquery properly, you can use any of the comparison operators to compare column values. In addition, you re not limited to numbers. Character strings can also be compared in comparison predicates.

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