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The subquery finds the employee number for Sue Smith, and the WHERE clause then selects the orders with a matching value. As this example shows, subqueries can play an important role in the DELETE statement because they let you delete rows based on information in other tables. Here are two more examples of DELETE statements that use subquery search conditions: Delete customers served by salespeople whose sales are less than 80 percent of quota.

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. . . /* Program has previously generated and prepared a SELECT statement like this one: SELECT A, B, C ... FROM SALESREPS WHERE EMPL_NUM IN ( , , ... ) with a variable number of parameters to be specified. The number of parameters for this execution is stored in the variable parmcnt. */ char *malloc() SQLDA *parmda; SQLVAR *parmvar; long parm_value[101]; /* Allocate a SQLDA to pass parameter values */ parmda = (SQLDA *)malloc(sizeof(SQLDA) + parmcnt * sizeof(SQLVAR)); parmda->sqln = parmcnt; /*Prompt the user for parameter values */ for (i = 0; i < parmcnt; i++) { printf("Enter employee number: "); scanf("%ld", &(parm_value[i])); parmvar = parmda -> sqlvar + i; parmvar->sqltype = 496; parmvar->sqllen = 4; parmvar->sqldata = &(parm_value[i]); parmvar->sqlind = 0; } /* Open the cursor to start the query, passing parameters */ exec sql open qrycursor using descriptor :parmda; . . .

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DELETE FROM CUSTOMERS WHERE CUST_REP IN (SELECT EMPL_NUM FROM SALESREPS WHERE SALES < (.8 * QUOTA)); 2 rows deleted.

constraints The complete scheme includes four types of constraints: Column constraints are specified as part of a column definition when a table is created Conceptually, they restrict the legal values that may appear in the column Column constraints appear in the individual column definitions within the CREATE TABLE statement Domains are a specialized form of column constraints They provide a limited capability to define new data types within a database In effect, a domain is one of the predefined database data types plus some additional constraints, which are specified as part of the domain definition Once a domain is defined and named, the domain name can be used in place of a data type to define new columns The columns "inherit" the constraints of the domain Domains are defined outside of the table and column definitions of the database, using the CREATE DOMAIN statement.

Figure 18-14.

Part III:

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The dynamic FETCH statement, shown in Figure 18-15, is a variation of the static FETCH statement It advances the cursor to the next available row of query results and retrieves the values of its columns into the program s data areas Recall from 17 that the static FETCH statement includes an INTO clause with a list of host variables that receive the retrieved column values In the dynamic FETCH statement, the list of host variables is replaced by a SQLDA Before using the dynamic FETCH statement, it is the application program s responsibility to provide data areas to receive the retrieved data and indicator variable for each column The application program must also fill in the SQLDATA, SQLIND, and SQLLEN fields in the SQLVAR structure for each column, as follows: I The SQLDATA field must point to the data area for the retrieved data.

DELETE FROM SALESREPS WHERE (.02 * QUOTA) > (SELECT SUM(AMOUNT) FROM ORDERS WHERE REP = EMPL_NUM); 1 row deleted.

I The SQLLEN field must specify the length of the data area pointed to by the SQLDATA field This value must be correctly specified to make sure the DBMS does not copy retrieved data beyond the end of the data area I The SQLIND field must point to an indicator variable for the column (a 2-byte integer) If no indicator variable is used for a particular column, the SQLIND field for the corresponding SQLVAR structure should be set to zero Normally, the application program allocates a SQLDA, uses the DESCRIBE statement to get a description of the query results, allocates storage for each column of query results, and sets the SQLDATA and SQLIND values, all before opening the cursor This same SQLDA is then passed to the FETCH statement.

Subqueries in the WHERE clause can be nested just as they can be in the WHERE clause of the SELECT statement. They can also contain outer references to the target table of the DELETE statement. In this respect, the FROM clause of the DELETE statement functions like the FROM clause of the SELECT statement. Here is an example of a deletion request that requires a subquery with an outer reference: Delete customers who have not ordered since November 10, 2007.

However, there is no requirement that the same SQLDA be used or that the SQLDA specify the same data areas for each FETCH statement It is perfectly acceptable for the application program to change the SQLDATA and SQLIND pointers between FETCH statements, retrieving two successive rows into different locations..

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