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Many organizations can use the files that are provided by Microsoft without customization at all. These organizations can do so because the installation type that they require is of a standard nature and requires no customization. For those organizations that do require specific customization, you can create a new initialization file using the Setup Utility as described earlier. Now, the normal way to use this file would be to execute the complex command line that begins the Setup Utility with the ISS file. If, however, you simply change the name of the SETUP.ISS file to SLQ70CST.ISS, you can use the SQL70CST.BAT command file to execute the installation. (This method prevents you from having to memorize the correct syntax for the SQL Server Setup Utility.) You can also manually call to the initialization file by specifying the F1 switch when you execute the Setup Utility, for example:

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selects pairs of rows where the QUOTA column from the SALESREPS row exceeds the TARGET column from the OFFICES row. Note that the pairs of SALESREPS and OFFICES rows selected are related only in this way; it is specifically not required that the SALESREPS row represent someone who works in the office represented by the OFFICES row. Admittedly, the example is a bit farfetched, and it illustrates why joins based on inequalities are not very common. However, they can be useful in decision-support applications and other applications that explore more complex interrelationships in the database.

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The multitable queries described thus far have not required any special SQL syntax or language features beyond those described for single-table queries. However, some multitable queries cannot be expressed without some additional SQL features. Specifically: Qualified column names are sometimes needed in multitable queries to eliminate ambiguous column references. All-column selections (SELECT *) have a special meaning for multitable queries. Self-joins can be used to create a multitable query that relates a table to itself. Table aliases can be used in the FROM clause to simplify qualified column names and to allow unambiguous column references in self-joins.

15. Which type of join contains an ON clause A Cross join B Comma-separated join C Natural join D Condition join 16. A(n) ____________ operator allows you to combine separate SELECT statements into one

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17. What keyword can you use with a UNION operator to return all rows in the query results,

Multitable Queries (Joins)

The sample database includes several instances where two tables contain columns with the same name. The OFFICES table and the SALESREPS table, for example, both have a column named SALES. The column in the OFFICES table contains year-to-date sales for each office; the one in the SALESREPS table contains year-to-date sales for each salesperson. Normally, there is no confusion between the two columns, because the FROM clause determines which of them is appropriate in any given query, as in these examples: Show the cities where sales exceed target.

Create Subqueries That Return Multiple Rows Create Subqueries That Return One Value Work with Correlated Subqueries Use Nested Subqueries Use Subqueries to Modify Data

SELECT CITY, SALES FROM OFFICES WHERE SALES > TARGET;

Show all salespeople with sales over $350,000.

ubqueries, like joins, provide a way to access data in multiple tables with a single query. A subquery can be added to a SELECT, INSERT, UPDATE, or DELETE statement in order to allow that statement to use the query results returned by the subquery. The subquery is essentially an embedded SELECT statement that acts as a gateway to data in a second table. The data returned by the subquery is used by the primary statement to meet whatever conditions have been defined in that statement. In this chapter, I discuss how subqueries are used in various statements, particularly SELECT statements, and provide examples that demonstrate how to create subqueries and what type of query results to expect.

SELECT NAME, SALES FROM SALESREPS WHERE SALES > 350000.00;

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