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In a relation with a single attribute as the unique identi er, it s impossible for anything to depend on part of the unique identi er because the unique identi er, being made of only one attribute, simply has no parts It follows, then, that any rst normal form relation that has only a single attribute for its primary key is automatically in second normal form Once you nd a second normal form violation, the solution is to move the attribute(s) that is (are) partially dependent to a new relation where it depends on.

17:

Seasonal adjustment by moving the lamp up and down using the measurements listed above, it is possible to simulate the time of year. Latitude adjustment by setting the angle that the uppermost flat sheet makes with the base, you can adjust the heliodon for the latitude of your site. Time of day adjustment by rotating the assembly, you can simulate the earth s rotation on its axis, and simulate different times of day.

If a DBMS supports date/time data or other data types, other conversions are necessary. Some DBMS products return their internal date/time representations into an integer host variable. Others convert the date/time data to text format and return it into a string host variable. Table 17-1 summarized the data type conversions typically provided by DBMS products, but you must consult the embedded SQL documentation for your particular DBMS brand for specific information.

Like all embedded SQL statements, the singleton SELECT statement sets the values of the SQLCODE and SQLSTATE variables to indicate its completion status: I If a single row of query results is successfully retrieved, SQLCODE is set to zero and SQLSTATE is set to 00000; the host variables named in the INTO clause contain the retrieved values. I If the query produced an error, SQLCODE is set to a negative value and SQLSTATE is set to a nonzero error class (the first two characters of the five-digit SQLSTATE string); the host variables do not contain retrieved values. I If the query produced no rows of query results, a special NOT FOUND warning value is returned in SQLCODE, and SQLSTATE returns a NO DATA error class. I If the query produced more than one row of query results, it is treated as an error, and a negative SQLCODE is returned. The SQL1 standard specifies the NOT FOUND warning condition, but it does not specify a particular value to be returned. DB2 uses the value +100, and most other SQL products follow this convention, including the other IBM SQL products, Ingres, and SQLBase. This value is also specified in the SQL2 standard, but as noted previously, SQL2 strongly encourages the use of the new SQLSTATE error variable instead of the older SQLCODE values.

If the data to be retrieved from a database may contain NULL values, the singleton SELECT statement must provide a way for the DBMS to communicate the NULL values to the application program. To handle NULL values, embedded SQL uses indicator variables in the INTO clause, just as they are used in the VALUES clause of the INSERT statement and the SET clause of the UPDATE statement. When you specify a host variable in the INTO clause, you can follow it immediately with the name of a companion host indicator variable. Figure 17-21 shows a revised version of the program in Figure 17-20 that uses the indicator variable repquota_ind with the host variable repquota. Because the NAME and SALES columns are declared NOT NULL in the definition of the SALESREPS table, they cannot produce NULL output values, and no indicator variable is needed for those columns.

conversion functions, 116 117 CONVERT TO function, 117 correlated subqueries, 107 correlated subselects, 143 144 CREATE DATABASE statement, 70 CREATE INDEX statement, 76 77 CREATE TABLE statement, 70 77 CREATE USER statement, 194 CREATE VIEW statement, 77 78 cross joins, 140 Currency data type, 61 cursors CLOSE statement, 225 226 DECLARE CURSOR statement, 222 223 de ned, 222 FETCH statement, 224 OPEN CURSOR statement, 223 224 UPDATE and DELETE statements, 225

include sqlca; begin declare section; repnum; repname[16]; repquota; repsales; repquota_ind; end declare section;

/* /* /* /* /*

employee number (from user) */ retrieved salesperson name */ retrieved quota */ retrieved sales */ null quota indicator */

/* Prompt the user for the employee number */ printf("Enter salesrep number: "); scanf("%d", &repnum); /* Execute the SQL query */ exec sql select name, quota, sales from salesreps where empl_num = :repnum into :repname, :repquota, :repquota_ind, :repsales; /* Display the retrieved data */ if (sqlca.sqlcode = = 0) { printf("Name: %s\n", repname); if (repquota_ind < 0) printf("quota is NULL\n"); else printf("Quota: %f\n", repquota); printf("Sales: %f\n", repsales); } else if (sqlca.sqlcode = = 100) printf("No salesperson with that employee number.\n"); else printf("SQL error: %ld\n", sqlca.sqlcode); exit();