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FIGURE 6-1 SELECT statement syntax diagram
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The HAVING clause tells SQL to include only certain groups produced by the GROUP BY clause in the query results. Like the WHERE clause, it uses a search condition to specify the desired groups. The HAVING clause is described in 8. The ORDER BY clause sorts the query results based on the data in one or more columns. If it is omitted, the query results are not sorted. The ORDER BY clause is described in the Sorting Query Results (ORDER BY Clause) section later in this chapter.
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The SELECT Clause
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The SELECT clause that begins each SELECT statement specifies the data items to be retrieved by the query. The items are usually specified by a select list, a list of select items separated by commas. Each select item in the list generates a single column of query results, in left-to-right order. A select item can be one of the following: A column name, identifying a column from the table(s) named in the FROM clause. When a column name appears as a select item, SQL simply takes the value of that column from each row of the database table and places it in the corresponding row of query results. A constant, specifying that the same constant value is to appear in every row of the query results. A SQL expression, indicating that SQL must calculate the value to be placed into the query results, as specified by the expression. Each type of select item is described later in this chapter.
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Retrieving Data
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The FROM Clause
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The FROM clause consists of the keyword FROM, followed by a list of table specifications separated by commas. Each table specification identifies a table or view containing data to be retrieved by the query. These tables are called the source tables of the query (and of the SELECT statement) because they are the source of all of the data in the query results. All of the queries in this chapter have a single source table, and every FROM clause contains a single table name.
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Query Results
The result of a SQL query is always a table of data, just like the tables in the database. If you type a SELECT statement using interactive SQL, the DBMS displays the query results (which some vendors call a result set) in tabular form on your computer screen. If a computer program sends a query to the DBMS using programmatic SQL, the table of query results is returned to the program for processing. In either case, the query results always have the same tabular, row/column format as the actual tables in the database, as shown in Figure 6-2. Usually the query results will be a table with several columns and several rows. For example, the following query produces a table of three columns (because it asks for three items of data) and ten rows (because there are ten salespeople): List the names, offices, and hire dates of all salespeople.
SELECT NAME, REP_OFFICE, HIRE_DATE FROM SALESREPS; NAME REP_OFFICE HIRE_DATE -------------- ----------- ---------Bill Adams 13 2006-02-12 Mary Jones 11 2007-10-12 Sue Smith 21 2004-12-10 Sam Clark 11 2006-06-14 Bob Smith 12 2005-05-19 Dan Roberts 12 2004-10-20 Tom Snyder NULL 2008-01-13 Larry Fitch 21 2007-10-12 Paul Cruz 12 2005-03-01 Nancy Angelli 22 2006-11-14
In contrast, the following query produces a single row because only one salesperson has the requested employee number. Even though this single row of query results looks less tabular than the multirow results, SQL still considers it to be a table of three columns and one row. What are the name, quota, and sales of employee number 107
SELECT NAME, QUOTA, SALES FROM SALESREPS WHERE EMPL_NUM = 107; NAME QUOTA SALES -------------- ------------ -----------Nancy Angelli $300,000.00 $186,042.00
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